Vulnerabilities > CVE-2017-18206 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in multiple products

047910
CVSS 7.5 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
PARTIAL
Availability impact
PARTIAL
network
low complexity
zsh
canonical
CWE-119
nessus

Summary

In utils.c in zsh before 5.4, symlink expansion had a buffer overflow.

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Buffer Overflow via Environment Variables
    This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
  • Overflow Buffers
    Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
  • Client-side Injection-induced Buffer Overflow
    This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
  • Filter Failure through Buffer Overflow
    In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
  • MIME Conversion
    An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.

Nessus

  • NASL familyScientific Linux Local Security Checks
    NASL idSL_20180619_ZSH_ON_SL6_X.NASL
    descriptionSecurity Fix(es) : - zsh: Stack-based buffer overflow in gen_matches_files() at compctl.c (CVE-2018-1083) - zsh: buffer overflow when scanning very long directory paths for symbolic links (CVE-2014-10072) - zsh: buffer overrun in symlinks (CVE-2017-18206) - zsh: buffer overflow in utils.c:checkmailpath() can lead to local arbitrary code execution (CVE-2018-1100)
    last seen2020-03-18
    modified2018-07-03
    plugin id110893
    published2018-07-03
    reporterThis script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/110893
    titleScientific Linux Security Update : zsh on SL6.x i386/x86_64 (20180619)
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text is (C) Scientific Linux.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(110893);
      script_version("1.3");
      script_set_attribute(attribute:"plugin_modification_date", value:"2020/02/24");
    
      script_cve_id("CVE-2014-10072", "CVE-2017-18206", "CVE-2018-1083", "CVE-2018-1100");
    
      script_name(english:"Scientific Linux Security Update : zsh on SL6.x i386/x86_64 (20180619)");
      script_summary(english:"Checks rpm output for the updated packages");
    
      script_set_attribute(
        attribute:"synopsis", 
        value:
    "The remote Scientific Linux host is missing one or more security
    updates."
      );
      script_set_attribute(
        attribute:"description", 
        value:
    "Security Fix(es) :
    
      - zsh: Stack-based buffer overflow in gen_matches_files()
        at compctl.c (CVE-2018-1083)
    
      - zsh: buffer overflow when scanning very long directory
        paths for symbolic links (CVE-2014-10072)
    
      - zsh: buffer overrun in symlinks (CVE-2017-18206)
    
      - zsh: buffer overflow in utils.c:checkmailpath() can lead
        to local arbitrary code execution (CVE-2018-1100)"
      );
      # https://listserv.fnal.gov/scripts/wa.exe?A2=ind1807&L=scientific-linux-errata&F=&S=&P=714
      script_set_attribute(
        attribute:"see_also",
        value:"http://www.nessus.org/u?12b369be"
      );
      script_set_attribute(
        attribute:"solution", 
        value:"Update the affected zsh, zsh-debuginfo and / or zsh-html packages."
      );
      script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
      script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
    
      script_set_attribute(attribute:"plugin_type", value:"local");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:zsh");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:zsh-debuginfo");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:zsh-html");
      script_set_attribute(attribute:"cpe", value:"x-cpe:/o:fermilab:scientific_linux");
    
      script_set_attribute(attribute:"vuln_publication_date", value:"2018/02/27");
      script_set_attribute(attribute:"patch_publication_date", value:"2018/06/19");
      script_set_attribute(attribute:"plugin_publication_date", value:"2018/07/03");
      script_set_attribute(attribute:"generated_plugin", value:"current");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_copyright(english:"This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
      script_family(english:"Scientific Linux Local Security Checks");
    
      script_dependencies("ssh_get_info.nasl");
      script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/RedHat/release", "Host/RedHat/rpm-list");
    
      exit(0);
    }
    
    
    include("audit.inc");
    include("global_settings.inc");
    include("misc_func.inc");
    include("rpm.inc");
    
    if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
    release = get_kb_item("Host/RedHat/release");
    if (isnull(release) || "Scientific Linux " >!< release) audit(AUDIT_HOST_NOT, "running Scientific Linux");
    os_ver = pregmatch(pattern: "Scientific Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
    if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Scientific Linux");
    os_ver = os_ver[1];
    if (! preg(pattern:"^6([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Scientific Linux 6.x", "Scientific Linux " + os_ver);
    if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
    
    cpu = get_kb_item("Host/cpu");
    if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
    if (cpu >!< "x86_64" && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Scientific Linux", cpu);
    
    
    flag = 0;
    if (rpm_check(release:"SL6", reference:"zsh-4.3.11-8.el6")) flag++;
    if (rpm_check(release:"SL6", reference:"zsh-debuginfo-4.3.11-8.el6")) flag++;
    if (rpm_check(release:"SL6", reference:"zsh-html-4.3.11-8.el6")) flag++;
    
    
    if (flag)
    {
      security_report_v4(
        port       : 0,
        severity   : SECURITY_HOLE,
        extra      : rpm_report_get()
      );
      exit(0);
    }
    else
    {
      tested = pkg_tests_get();
      if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
      else audit(AUDIT_PACKAGE_NOT_INSTALLED, "zsh / zsh-debuginfo / zsh-html");
    }
    
  • NASL familyCentOS Local Security Checks
    NASL idCENTOS_RHSA-2018-1932.NASL
    descriptionAn update for zsh is now available for Red Hat Enterprise Linux 6. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. The zsh shell is a command interpreter usable as an interactive login shell and as a shell script command processor. Zsh resembles the ksh shell (the Korn shell), but includes many enhancements. Zsh supports command-line editing, built-in spelling correction, programmable command completion, shell functions (with autoloading), a history mechanism, and more. Security Fix(es) : * zsh: Stack-based buffer overflow in gen_matches_files() at compctl.c (CVE-2018-1083) * zsh: buffer overflow when scanning very long directory paths for symbolic links (CVE-2014-10072) * zsh: buffer overrun in symlinks (CVE-2017-18206) * zsh: buffer overflow in utils.c:checkmailpath() can lead to local arbitrary code execution (CVE-2018-1100) For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section. The CVE-2018-1083 and CVE-2018-1100 issues were discovered by Richard Maciel Costa (Red Hat). Additional Changes : For detailed information on changes in this release, see the Red Hat Enterprise Linux 6.10 Release Notes and Red Hat Enterprise Linux 6.10 Technical Notes linked from the References section.
    last seen2020-06-01
    modified2020-06-02
    plugin id110652
    published2018-06-22
    reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/110652
    titleCentOS 6 : zsh (CESA-2018:1932)
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were  
    # extracted from Red Hat Security Advisory RHSA-2018:1932 and 
    # CentOS Errata and Security Advisory 2018:1932 respectively.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(110652);
      script_version("1.4");
      script_cvs_date("Date: 2019/12/31");
    
      script_cve_id("CVE-2014-10072", "CVE-2017-18206", "CVE-2018-1083", "CVE-2018-1100");
      script_xref(name:"RHSA", value:"2018:1932");
    
      script_name(english:"CentOS 6 : zsh (CESA-2018:1932)");
      script_summary(english:"Checks rpm output for the updated packages");
    
      script_set_attribute(
        attribute:"synopsis", 
        value:"The remote CentOS host is missing one or more security updates."
      );
      script_set_attribute(
        attribute:"description", 
        value:
    "An update for zsh is now available for Red Hat Enterprise Linux 6.
    
    Red Hat Product Security has rated this update as having a security
    impact of Moderate. A Common Vulnerability Scoring System (CVSS) base
    score, which gives a detailed severity rating, is available for each
    vulnerability from the CVE link(s) in the References section.
    
    The zsh shell is a command interpreter usable as an interactive login
    shell and as a shell script command processor. Zsh resembles the ksh
    shell (the Korn shell), but includes many enhancements. Zsh supports
    command-line editing, built-in spelling correction, programmable
    command completion, shell functions (with autoloading), a history
    mechanism, and more.
    
    Security Fix(es) :
    
    * zsh: Stack-based buffer overflow in gen_matches_files() at compctl.c
    (CVE-2018-1083)
    
    * zsh: buffer overflow when scanning very long directory paths for
    symbolic links (CVE-2014-10072)
    
    * zsh: buffer overrun in symlinks (CVE-2017-18206)
    
    * zsh: buffer overflow in utils.c:checkmailpath() can lead to local
    arbitrary code execution (CVE-2018-1100)
    
    For more details about the security issue(s), including the impact, a
    CVSS score, and other related information, refer to the CVE page(s)
    listed in the References section.
    
    The CVE-2018-1083 and CVE-2018-1100 issues were discovered by Richard
    Maciel Costa (Red Hat).
    
    Additional Changes :
    
    For detailed information on changes in this release, see the Red Hat
    Enterprise Linux 6.10 Release Notes and Red Hat Enterprise Linux 6.10
    Technical Notes linked from the References section."
      );
      # https://lists.centos.org/pipermail/centos-cr-announce/2018-June/005308.html
      script_set_attribute(
        attribute:"see_also",
        value:"http://www.nessus.org/u?f2c935a2"
      );
      script_set_attribute(attribute:"solution", value:"Update the affected zsh packages.");
      script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
      script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
      script_set_attribute(attribute:"cvss_score_source", value:"CVE-2014-10072");
    
      script_set_attribute(attribute:"plugin_type", value:"local");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:zsh");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:zsh-html");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:6");
    
      script_set_attribute(attribute:"vuln_publication_date", value:"2018/02/27");
      script_set_attribute(attribute:"patch_publication_date", value:"2018/06/21");
      script_set_attribute(attribute:"plugin_publication_date", value:"2018/06/22");
      script_set_attribute(attribute:"generated_plugin", value:"current");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
      script_family(english:"CentOS Local Security Checks");
    
      script_dependencies("ssh_get_info.nasl");
      script_require_keys("Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/rpm-list");
    
      exit(0);
    }
    
    
    include("audit.inc");
    include("global_settings.inc");
    include("rpm.inc");
    
    
    if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
    release = get_kb_item("Host/CentOS/release");
    if (isnull(release) || "CentOS" >!< release) audit(AUDIT_OS_NOT, "CentOS");
    os_ver = pregmatch(pattern: "CentOS(?: Linux)? release ([0-9]+)", string:release);
    if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "CentOS");
    os_ver = os_ver[1];
    if (! preg(pattern:"^6([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 6.x", "CentOS " + os_ver);
    
    if (!get_kb_item("Host/CentOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
    
    
    cpu = get_kb_item("Host/cpu");
    if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
    if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "CentOS", cpu);
    
    
    flag = 0;
    if (rpm_check(release:"CentOS-6", reference:"zsh-4.3.11-8.el6.centos")) flag++;
    if (rpm_check(release:"CentOS-6", reference:"zsh-html-4.3.11-8.el6.centos")) flag++;
    
    
    if (flag)
    {
      cr_plugin_caveat = '\n' +
        'NOTE: The security advisory associated with this vulnerability has a\n' +
        'fixed package version that may only be available in the continuous\n' +
        'release (CR) repository for CentOS, until it is present in the next\n' +
        'point release of CentOS.\n\n' +
    
        'If an equal or higher package level does not exist in the baseline\n' +
        'repository for your major version of CentOS, then updates from the CR\n' +
        'repository will need to be applied in order to address the\n' +
        'vulnerability.\n';
      security_report_v4(
        port       : 0,
        severity   : SECURITY_HOLE,
        extra      : rpm_report_get() + cr_plugin_caveat
      );
      exit(0);
    }
    else
    {
      tested = pkg_tests_get();
      if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
      else audit(AUDIT_PACKAGE_NOT_INSTALLED, "zsh / zsh-html");
    }
    
  • NASL familyGentoo Local Security Checks
    NASL idGENTOO_GLSA-201805-10.NASL
    descriptionThe remote host is affected by the vulnerability described in GLSA-201805-10 (Zsh: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in Zsh. Please review the CVE identifiers referenced below for details. Impact : A local attacker could execute arbitrary code, escalate privileges, or cause a Denial of Service condition. Workaround : There is no known workaround at this time.
    last seen2020-06-01
    modified2020-06-02
    plugin id110174
    published2018-05-29
    reporterThis script is Copyright (C) 2018 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/110174
    titleGLSA-201805-10 : Zsh: Multiple vulnerabilities
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2018-1072-1.NASL
    descriptionThis update for zsh fixes the following issues : - CVE-2014-10070: environment variable injection could lead to local privilege escalation (bnc#1082885) - CVE-2014-10071: buffer overflow in exec.c could lead to denial of service. (bnc#1082977) - CVE-2014-10072: buffer overflow In utils.c when scanning very long directory paths for symbolic links. (bnc#1082975) - CVE-2016-10714: In zsh before 5.3, an off-by-one error resulted in undersized buffers that were intended to support PATH_MAX characters. (bnc#1083250) - CVE-2017-18205: In builtin.c when sh compatibility mode is used, a NULL pointer dereference could lead to denial of service (bnc#1082998) - CVE-2018-1071: exec.c:hashcmd() function vulnerability could lead to denial of service. (bnc#1084656) - CVE-2018-1083: Autocomplete vulnerability could lead to privilege escalation. (bnc#1087026) - CVE-2018-7549: In params.c in zsh through 5.4.2, there is a crash during a copy of an empty hash table, as demonstrated by typeset -p. (bnc#1082991) - CVE-2017-18206: buffer overrun in xsymlinks could lead to denial of service (bnc#1083002) - Autocomplete and REPORTTIME broken (bsc#896914) Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-01
    modified2020-06-02
    plugin id109355
    published2018-04-26
    reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/109355
    titleSUSE SLED12 / SLES12 Security Update : zsh (SUSE-SU-2018:1072-1)
  • NASL familyAmazon Linux Local Security Checks
    NASL idALA_ALAS-2018-1107.NASL
    descriptionA buffer overflow flaw was found in the zsh shell symbolic link resolver. A local, unprivileged user can create a specially crafted directory path which leads to a buffer overflow in the context of the user trying to do a symbolic link resolution in the aforementioned path. If the user affected is privileged, this leads to privilege escalation.(CVE-2017-18206) A buffer overflow flaw was found in the zsh shell auto-complete functionality. A local, unprivileged user can create a specially crafted directory path which leads to code execution in the context of the user who tries to use auto-complete to traverse the before mentioned path. If the user affected is privileged, this leads to privilege escalation.(CVE-2018-1083) A NULL pointer dereference flaw was found in the code responsible for saving hashtables of the zsh package. An attacker could use this flaw to cause a denial of service by crashing the user shell.(CVE-2018-7549) A NULL pointer dereference flaw was found in the code responsible for the cd builtin command of the zsh package. An attacker could use this flaw to cause a denial of service by crashing the user shell.(CVE-2017-18205) A buffer overflow flaw was found in the zsh shell symbolic link resolver. A local, unprivileged user can create a specially crafted directory path which leads to a buffer overflow in the context of the user trying to do symbolic link resolution in the aforementioned path. An attacker could exploit this vulnerability to cause a denial of service condition on the target.(CVE-2014-10072) A buffer overflow flaw was found in the zsh shell check path functionality. A local, unprivileged user can create a specially crafted message file, which, if used to set a custom
    last seen2020-06-10
    modified2018-12-07
    plugin id119466
    published2018-12-07
    reporterThis script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/119466
    titleAmazon Linux AMI : zsh (ALAS-2018-1107)
  • NASL familyRed Hat Local Security Checks
    NASL idREDHAT-RHSA-2018-1932.NASL
    descriptionAn update for zsh is now available for Red Hat Enterprise Linux 6. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. The zsh shell is a command interpreter usable as an interactive login shell and as a shell script command processor. Zsh resembles the ksh shell (the Korn shell), but includes many enhancements. Zsh supports command-line editing, built-in spelling correction, programmable command completion, shell functions (with autoloading), a history mechanism, and more. Security Fix(es) : * zsh: Stack-based buffer overflow in gen_matches_files() at compctl.c (CVE-2018-1083) * zsh: buffer overflow when scanning very long directory paths for symbolic links (CVE-2014-10072) * zsh: buffer overrun in symlinks (CVE-2017-18206) * zsh: buffer overflow in utils.c:checkmailpath() can lead to local arbitrary code execution (CVE-2018-1100) For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section. The CVE-2018-1083 and CVE-2018-1100 issues were discovered by Richard Maciel Costa (Red Hat). Additional Changes : For detailed information on changes in this release, see the Red Hat Enterprise Linux 6.10 Release Notes and Red Hat Enterprise Linux 6.10 Technical Notes linked from the References section.
    last seen2020-06-01
    modified2020-06-02
    plugin id110607
    published2018-06-19
    reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/110607
    titleRHEL 6 : zsh (RHSA-2018:1932)
  • NASL familyScientific Linux Local Security Checks
    NASL idSL_20181030_ZSH_ON_SL7_X.NASL
    descriptionSecurity Fix(es) : - zsh: Stack-based buffer overflow in gen_matches_files() at compctl.c (CVE-2018-1083) - zsh: buffer overflow for very long fds in >&amp; fd syntax (CVE-2014-10071) - zsh: buffer overflow when scanning very long directory paths for symbolic links (CVE-2014-10072) - zsh: NULL dereference in cd in sh compatibility mode under given circumstances (CVE-2017-18205) - zsh: buffer overrun in symlinks (CVE-2017-18206) - zsh: Stack-based buffer overflow in exec.c:hashcmd() (CVE-2018-1071) - zsh: buffer overflow in utils.c:checkmailpath() can lead to local arbitrary code execution (CVE-2018-1100) - zsh: crash on copying empty hash table (CVE-2018-7549)
    last seen2020-03-18
    modified2018-11-27
    plugin id119204
    published2018-11-27
    reporterThis script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/119204
    titleScientific Linux Security Update : zsh on SL7.x x86_64 (20181030)
  • NASL familyHuawei Local Security Checks
    NASL idEULEROS_SA-2018-1090.NASL
    descriptionAccording to the versions of the zsh package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : - The zsh shell is a command interpreter usable as an interactive login shell and as a shell script command processor. Zsh resembles the ksh shell (the Korn shell), but includes many enhancements. Zsh supports command line editing, built-in spelling correction, programmable command completion, shell functions (with autoloading), a history mechanism, and more. - Security fix(es): - In builtin.c in zsh before 5.4, when sh compatibility mode is used, there is a NULL pointer dereference during processing of the cd command with no argument if HOME is not set.(CVE-2017-18205) - zsh before 5.0.7 allows evaluation of the initial values of integer variables imported from the environment (instead of treating them as literal numbers). That could allow local privilege escalation, under some specific and atypical conditions where zsh is being invoked in privilege-elevation contexts when the environment has not been properly sanitized, such as when zsh is invoked by sudo on systems where
    last seen2020-05-06
    modified2018-05-02
    plugin id109488
    published2018-05-02
    reporterThis script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/109488
    titleEulerOS 2.0 SP1 : zsh (EulerOS-SA-2018-1090)
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2018-399.NASL
    descriptionThis update for zsh fixes the following issues : - CVE-2014-10070: environment variable injection could lead to local privilege escalation (bnc#1082885) - CVE-2014-10071: buffer overflow in exec.c could lead to denial of service. (bnc#1082977) - CVE-2014-10072: buffer overflow In utils.c when scanning very long directory paths for symbolic links. (bnc#1082975) - CVE-2016-10714: In zsh before 5.3, an off-by-one error resulted in undersized buffers that were intended to support PATH_MAX characters. (bnc#1083250) - CVE-2017-18205: In builtin.c when sh compatibility mode is used, a NULL pointer dereference could lead to denial of service (bnc#1082998) - CVE-2018-1071: exec.c:hashcmd() function vulnerability could lead to denial of service. (bnc#1084656) - CVE-2018-1083: Autocomplete vulnerability could lead to privilege escalation. (bnc#1087026) - CVE-2018-7549: In params.c in zsh through 5.4.2, there is a crash during a copy of an empty hash table, as demonstrated by typeset -p. (bnc#1082991) - CVE-2017-18206: buffer overrun in xsymlinks could lead to denial of service (bnc#1083002) - Autocomplete and REPORTTIME broken (bsc#896914) This update was imported from the SUSE:SLE-12:Update update project.
    last seen2020-06-05
    modified2018-04-27
    plugin id109384
    published2018-04-27
    reporterThis script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/109384
    titleopenSUSE Security Update : zsh (openSUSE-2018-399)
  • NASL familyNewStart CGSL Local Security Checks
    NASL idNEWSTART_CGSL_NS-SA-2019-0144_ZSH.NASL
    descriptionThe remote NewStart CGSL host, running version MAIN 4.05, has zsh packages installed that are affected by multiple vulnerabilities: - A buffer overflow flaw was found in the zsh shell check path functionality. A local, unprivileged user can create a specially crafted message file, which, if used to set a custom you have new mail message, leads to code execution in the context of the user who receives the message. If the user affected is privileged, this leads to privilege escalation. (CVE-2018-1100) - A buffer overflow flaw was found in the zsh shell auto- complete functionality. A local, unprivileged user can create a specially crafted directory path which leads to code execution in the context of the user who tries to use auto-complete to traverse the before mentioned path. If the user affected is privileged, this leads to privilege escalation. (CVE-2018-1083) - A buffer overflow flaw was found in the zsh shell symbolic link resolver. A local, unprivileged user can create a specially crafted directory path which leads to a buffer overflow in the context of the user trying to do a symbolic link resolution in the aforementioned path. If the user affected is privileged, this leads to privilege escalation. (CVE-2017-18206) - A buffer overflow flaw was found in the zsh shell symbolic link resolver. A local, unprivileged user can create a specially crafted directory path which leads to a buffer overflow in the context of the user trying to do symbolic link resolution in the aforementioned path. An attacker could exploit this vulnerability to cause a denial of service condition on the target. (CVE-2014-10072) Note that Nessus has not tested for this issue but has instead relied only on the application
    last seen2020-06-01
    modified2020-06-02
    plugin id127411
    published2019-08-12
    reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/127411
    titleNewStart CGSL MAIN 4.05 : zsh Multiple Vulnerabilities (NS-SA-2019-0144)
  • NASL familyHuawei Local Security Checks
    NASL idEULEROS_SA-2018-1091.NASL
    descriptionAccording to the versions of the zsh package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : - The zsh shell is a command interpreter usable as an interactive login shell and as a shell script command processor. Zsh resembles the ksh shell (the Korn shell), but includes many enhancements. Zsh supports command line editing, built-in spelling correction, programmable command completion, shell functions (with autoloading), a history mechanism, and more. - Security fix(es): - In builtin.c in zsh before 5.4, when sh compatibility mode is used, there is a NULL pointer dereference during processing of the cd command with no argument if HOME is not set.(CVE-2017-18205) - zsh before 5.0.7 allows evaluation of the initial values of integer variables imported from the environment (instead of treating them as literal numbers). That could allow local privilege escalation, under some specific and atypical conditions where zsh is being invoked in privilege-elevation contexts when the environment has not been properly sanitized, such as when zsh is invoked by sudo on systems where
    last seen2020-05-06
    modified2018-05-02
    plugin id109489
    published2018-05-02
    reporterThis script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/109489
    titleEulerOS 2.0 SP2 : zsh (EulerOS-SA-2018-1091)
  • NASL familyNewStart CGSL Local Security Checks
    NASL idNEWSTART_CGSL_NS-SA-2019-0070_ZSH.NASL
    descriptionThe remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has zsh packages installed that are affected by multiple vulnerabilities: - A buffer overflow flaw was found in the zsh shell file descriptor redirection functionality. An attacker could use this flaw to cause a denial of service by crashing the user shell. (CVE-2014-10071) - A NULL pointer dereference flaw was found in the code responsible for the cd builtin command of the zsh package. An attacker could use this flaw to cause a denial of service by crashing the user shell. (CVE-2017-18205) - A buffer overflow flaw was found in the zsh shell check path functionality. A local, unprivileged user can create a specially crafted message file, which, if used to set a custom you have new mail message, leads to code execution in the context of the user who receives the message. If the user affected is privileged, this leads to privilege escalation. (CVE-2018-1100) - A buffer overflow flaw was found in the zsh shell auto- complete functionality. A local, unprivileged user can create a specially crafted directory path which leads to code execution in the context of the user who tries to use auto-complete to traverse the before mentioned path. If the user affected is privileged, this leads to privilege escalation. (CVE-2018-1083) - zsh through version 5.4.2 is vulnerable to a stack-based buffer overflow in the exec.c:hashcmd() function. A local attacker could exploit this to cause a denial of service. (CVE-2018-1071) - A NULL pointer dereference flaw was found in the code responsible for saving hashtables of the zsh package. An attacker could use this flaw to cause a denial of service by crashing the user shell. (CVE-2018-7549) - A buffer overflow flaw was found in the zsh shell symbolic link resolver. A local, unprivileged user can create a specially crafted directory path which leads to a buffer overflow in the context of the user trying to do a symbolic link resolution in the aforementioned path. If the user affected is privileged, this leads to privilege escalation. (CVE-2017-18206) - A buffer overflow flaw was found in the zsh shell symbolic link resolver. A local, unprivileged user can create a specially crafted directory path which leads to a buffer overflow in the context of the user trying to do symbolic link resolution in the aforementioned path. An attacker could exploit this vulnerability to cause a denial of service condition on the target. (CVE-2014-10072) Note that Nessus has not tested for this issue but has instead relied only on the application
    last seen2020-06-01
    modified2020-06-02
    plugin id127273
    published2019-08-12
    reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/127273
    titleNewStart CGSL CORE 5.04 / MAIN 5.04 : zsh Multiple Vulnerabilities (NS-SA-2019-0070)
  • NASL familyCentOS Local Security Checks
    NASL idCENTOS_RHSA-2018-3073.NASL
    descriptionAn update for zsh is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. The zsh shell is a command interpreter usable as an interactive login shell and as a shell script command processor. Zsh resembles the ksh shell (the Korn shell), but includes many enhancements. Zsh supports command-line editing, built-in spelling correction, programmable command completion, shell functions (with autoloading), a history mechanism, and more. Security Fix(es) : * zsh: Stack-based buffer overflow in gen_matches_files() at compctl.c (CVE-2018-1083) * zsh: buffer overflow for very long fds in >& fd syntax (CVE-2014-10071) * zsh: buffer overflow when scanning very long directory paths for symbolic links (CVE-2014-10072) * zsh: NULL dereference in cd in sh compatibility mode under given circumstances (CVE-2017-18205) * zsh: buffer overrun in symlinks (CVE-2017-18206) * zsh: Stack-based buffer overflow in exec.c:hashcmd() (CVE-2018-1071) * zsh: buffer overflow in utils.c:checkmailpath() can lead to local arbitrary code execution (CVE-2018-1100) * zsh: crash on copying empty hash table (CVE-2018-7549) For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section. The CVE-2018-1083, CVE-2018-1071, and CVE-2018-1100 issues were discovered by Richard Maciel Costa (Red Hat). Additional Changes : For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.6 Release Notes linked from the References section.
    last seen2020-06-01
    modified2020-06-02
    plugin id118989
    published2018-11-16
    reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/118989
    titleCentOS 7 : zsh (CESA-2018:3073)
  • NASL familyUbuntu Local Security Checks
    NASL idUBUNTU_USN-3593-1.NASL
    descriptionIt was discovered that Zsh incorrectly handled certain enviroment variables. An attacker could possibly use this issue to gain privileged access to the system. This issue only affected Ubuntu 14.04 LTS. (CVE-2014-10070) It was discovered that Zsh incorrectly handled certain inputs. An attacker could possibly use this to execute arbitrary code. This issue only affected Ubuntu 14.04 LTS. (CVE-2014-10071) It was discovered that Zsh incorrectly handled some symbolic links. An attacker could possibly use this to execute arbitrary code. This issue only affected Ubuntu 14.04 LTS. (CVE-2014-10072) It was discovered that Zsh incorrectly handled certain errors. An attacker could possibly use this issue to cause a denial of service. (CVE-2016-10714) It was discovered that Zsh incorrectly handled certain commands. An attacker could possibly use this to execute arbitrary code. (CVE-2017-18205) It was discovered that Zsh incorrectly handled certain symlinks. An attacker could possibly use this to execute arbitrary code. This issue only affected Ubuntu 16.04 LTS and Ubuntu 17.10. (CVE-2017-18206) It was discovered that Zsh incorrectly handled certain inputs. An attacker could possible use to execute arbitrary code. This issue only affected Ubuntu 17.10. (CVE-2018-7548) It was discovered that Zsh incorrectly handled certain inputs. An attacker could possibly use this to cause a denial of service. (CVE-2018-7549). Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-01
    modified2020-06-02
    plugin id107257
    published2018-03-09
    reporterUbuntu Security Notice (C) 2018-2019 Canonical, Inc. / NASL script (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/107257
    titleUbuntu 14.04 LTS / 16.04 LTS / 17.10 : zsh vulnerabilities (USN-3593-1)
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2018-9CDF18A850.NASL
    description - avoid crash when copying empty hash table (CVE-2018-7549) - avoid NULL dereference when using ```${(PA)...}``` on an empty array (CVE-2018-7548) - fix buffer overrun in xsymlinks (CVE-2017-18206) - fix NULL dereference in cd (CVE-2017-18205) Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-05
    modified2018-03-21
    plugin id108506
    published2018-03-21
    reporterThis script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/108506
    titleFedora 26 : zsh (2018-9cdf18a850)
  • NASL familySlackware Local Security Checks
    NASL idSLACKWARE_SSA_2019-013-01.NASL
    descriptionNew zsh packages are available for Slackware 14.0, 14.1, and 14.2 to fix security issues.
    last seen2020-03-17
    modified2019-01-14
    plugin id121145
    published2019-01-14
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/121145
    titleSlackware 14.0 / 14.1 / 14.2 : zsh (SSA:2019-013-01)
  • NASL familyOracle Linux Local Security Checks
    NASL idORACLELINUX_ELSA-2018-3073.NASL
    descriptionFrom Red Hat Security Advisory 2018:3073 : An update for zsh is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. The zsh shell is a command interpreter usable as an interactive login shell and as a shell script command processor. Zsh resembles the ksh shell (the Korn shell), but includes many enhancements. Zsh supports command-line editing, built-in spelling correction, programmable command completion, shell functions (with autoloading), a history mechanism, and more. Security Fix(es) : * zsh: Stack-based buffer overflow in gen_matches_files() at compctl.c (CVE-2018-1083) * zsh: buffer overflow for very long fds in >& fd syntax (CVE-2014-10071) * zsh: buffer overflow when scanning very long directory paths for symbolic links (CVE-2014-10072) * zsh: NULL dereference in cd in sh compatibility mode under given circumstances (CVE-2017-18205) * zsh: buffer overrun in symlinks (CVE-2017-18206) * zsh: Stack-based buffer overflow in exec.c:hashcmd() (CVE-2018-1071) * zsh: buffer overflow in utils.c:checkmailpath() can lead to local arbitrary code execution (CVE-2018-1100) * zsh: crash on copying empty hash table (CVE-2018-7549) For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section. The CVE-2018-1083, CVE-2018-1071, and CVE-2018-1100 issues were discovered by Richard Maciel Costa (Red Hat). Additional Changes : For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.6 Release Notes linked from the References section.
    last seen2020-06-01
    modified2020-06-02
    plugin id118769
    published2018-11-07
    reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/118769
    titleOracle Linux 7 : zsh (ELSA-2018-3073)
  • NASL familyAmazon Linux Local Security Checks
    NASL idAL2_ALAS-2018-986.NASL
    descriptionNULL dereference in cd in sh compatibility mode under given circumstances In builtin.c in zsh before 5.4, when sh compatibility mode is used, there is a NULL pointer dereference during processing of the cd command with no argument if HOME is not set. (CVE-2017-18205) NULL pointer deref when using ${(PA)...} on an empty array result : In subst.c in zsh through 5.4.2, there is a NULL pointer dereference when using ${(PA)...} on an empty array result. (CVE-2018-7548) Buffer overrun in xsymlinks In utils.c in zsh before 5.4, symlink expansion had a buffer overflow. (CVE-2017-18206) Crash on copying empty hash table In params.c in zsh through 5.4.2, there is a crash during a copy of an empty hash table, as demonstrated by typeset -p. (CVE-2018-7549)
    last seen2020-06-01
    modified2020-06-02
    plugin id109139
    published2018-04-18
    reporterThis script is Copyright (C) 2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/109139
    titleAmazon Linux 2 : zsh (ALAS-2018-986)
  • NASL familyOracle Linux Local Security Checks
    NASL idORACLELINUX_ELSA-2018-1932.NASL
    descriptionFrom Red Hat Security Advisory 2018:1932 : An update for zsh is now available for Red Hat Enterprise Linux 6. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. The zsh shell is a command interpreter usable as an interactive login shell and as a shell script command processor. Zsh resembles the ksh shell (the Korn shell), but includes many enhancements. Zsh supports command-line editing, built-in spelling correction, programmable command completion, shell functions (with autoloading), a history mechanism, and more. Security Fix(es) : * zsh: Stack-based buffer overflow in gen_matches_files() at compctl.c (CVE-2018-1083) * zsh: buffer overflow when scanning very long directory paths for symbolic links (CVE-2014-10072) * zsh: buffer overrun in symlinks (CVE-2017-18206) * zsh: buffer overflow in utils.c:checkmailpath() can lead to local arbitrary code execution (CVE-2018-1100) For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section. The CVE-2018-1083 and CVE-2018-1100 issues were discovered by Richard Maciel Costa (Red Hat). Additional Changes : For detailed information on changes in this release, see the Red Hat Enterprise Linux 6.10 Release Notes and Red Hat Enterprise Linux 6.10 Technical Notes linked from the References section.
    last seen2020-06-01
    modified2020-06-02
    plugin id110707
    published2018-06-27
    reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/110707
    titleOracle Linux 6 : zsh (ELSA-2018-1932)
  • NASL familyRed Hat Local Security Checks
    NASL idREDHAT-RHSA-2018-3073.NASL
    descriptionAn update for zsh is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. The zsh shell is a command interpreter usable as an interactive login shell and as a shell script command processor. Zsh resembles the ksh shell (the Korn shell), but includes many enhancements. Zsh supports command-line editing, built-in spelling correction, programmable command completion, shell functions (with autoloading), a history mechanism, and more. Security Fix(es) : * zsh: Stack-based buffer overflow in gen_matches_files() at compctl.c (CVE-2018-1083) * zsh: buffer overflow for very long fds in >& fd syntax (CVE-2014-10071) * zsh: buffer overflow when scanning very long directory paths for symbolic links (CVE-2014-10072) * zsh: NULL dereference in cd in sh compatibility mode under given circumstances (CVE-2017-18205) * zsh: buffer overrun in symlinks (CVE-2017-18206) * zsh: Stack-based buffer overflow in exec.c:hashcmd() (CVE-2018-1071) * zsh: buffer overflow in utils.c:checkmailpath() can lead to local arbitrary code execution (CVE-2018-1100) * zsh: crash on copying empty hash table (CVE-2018-7549) For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section. The CVE-2018-1083, CVE-2018-1071, and CVE-2018-1100 issues were discovered by Richard Maciel Costa (Red Hat). Additional Changes : For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.6 Release Notes linked from the References section.
    last seen2020-06-01
    modified2020-06-02
    plugin id118524
    published2018-10-31
    reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/118524
    titleRHEL 7 : zsh (RHSA-2018:3073)
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DLA-1304.NASL
    descriptionIt was discovered that there were multiple vulnerabilities in the
    last seen2020-03-17
    modified2018-03-12
    plugin id107276
    published2018-03-12
    reporterThis script is Copyright (C) 2018-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/107276
    titleDebian DLA-1304-1 : zsh security update
  • NASL familyHuawei Local Security Checks
    NASL idEULEROS_SA-2018-1396.NASL
    descriptionAccording to the versions of the zsh package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : - zsh: buffer overflow for very long fds in i1/4zi1/4+ fd syntax (CVE-2014-10071) - zsh: buffer overflow when scanning very long directory paths for symbolic links (CVE-2014-10072) - zsh: NULL dereference in cd in sh compatibility mode under given circumstances (CVE-2017-18205) - zsh: buffer overrun in symlinks (CVE-2017-18206) - zsh: Stack-based buffer overflow in exec.c:hashcmd() (CVE-2018-1071) - zsh: buffer overflow in utils.c:checkmailpath() can lead to local arbitrary code execution (CVE-2018-1100) - zsh: crash on copying empty hash table (CVE-2018-7549) Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-05-15
    modified2018-12-10
    plugin id119524
    published2018-12-10
    reporterThis script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/119524
    titleEulerOS 2.0 SP3 : zsh (EulerOS-SA-2018-1396)

Redhat

advisories
  • rhsa
    idRHSA-2018:1932
  • rhsa
    idRHSA-2018:3073
rpms
  • zsh-0:4.3.11-8.el6
  • zsh-debuginfo-0:4.3.11-8.el6
  • zsh-html-0:4.3.11-8.el6
  • zsh-0:5.0.2-31.el7
  • zsh-debuginfo-0:5.0.2-31.el7
  • zsh-html-0:5.0.2-31.el7