Vulnerabilities > CVE-2017-12942 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Rarlab Unrar 0.0.1/5.5.4/5.5.6

047910
CVSS 9.8 - CRITICAL
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
HIGH
network
low complexity
rarlab
CWE-119
critical
nessus

Summary

libunrar.a in UnRAR before 5.5.7 has a buffer overflow in the Unpack::LongLZ function.

Vulnerable Configurations

Part Description Count
Application
Rarlab
3

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 familySuSE Local Security Checks
    NASL idSUSE_SU-2018-0862-1.NASL
    descriptionThis update for unrar to version 5.6.1 fixes several issues. These security issues were fixed : - CVE-2017-12938: Prevent remote attackers to bypass a directory-traversal protection mechanism via vectors involving a symlink to the . directory, a symlink to the .. directory, and a regular file (bsc#1054038). - CVE-2017-12940: Prevent out-of-bounds read in the EncodeFileName::Decode call within the Archive::ReadHeader15 function (bsc#1054038). - CVE-2017-12941: Prevent an out-of-bounds read in the Unpack::Unpack20 function (bsc#1054038). - CVE-2017-12942: Prevent a buffer overflow in the Unpack::LongLZ function (bsc#1054038). The update package also includes non-security fixes. See advisory for details. 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 id108828
    published2018-04-04
    reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/108828
    titleSUSE SLES11 Security Update : unrar (SUSE-SU-2018:0862-1)
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were
    # extracted from SUSE update advisory SUSE-SU-2018:0862-1.
    # The text itself is copyright (C) SUSE.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(108828);
      script_version("1.4");
      script_cvs_date("Date: 2019/09/10 13:51:47");
    
      script_cve_id("CVE-2012-6706", "CVE-2017-12938", "CVE-2017-12940", "CVE-2017-12941", "CVE-2017-12942");
    
      script_name(english:"SUSE SLES11 Security Update : unrar (SUSE-SU-2018:0862-1)");
      script_summary(english:"Checks rpm output for the updated package.");
    
      script_set_attribute(
        attribute:"synopsis", 
        value:"The remote SUSE host is missing one or more security updates."
      );
      script_set_attribute(
        attribute:"description", 
        value:
    "This update for unrar to version 5.6.1 fixes several issues. These
    security issues were fixed :
    
      - CVE-2017-12938: Prevent remote attackers to bypass a
        directory-traversal protection mechanism via vectors
        involving a symlink to the . directory, a symlink to the
        .. directory, and a regular file (bsc#1054038).
    
      - CVE-2017-12940: Prevent out-of-bounds read in the
        EncodeFileName::Decode call within the
        Archive::ReadHeader15 function (bsc#1054038).
    
      - CVE-2017-12941: Prevent an out-of-bounds read in the
        Unpack::Unpack20 function (bsc#1054038).
    
      - CVE-2017-12942: Prevent a buffer overflow in the
        Unpack::LongLZ function (bsc#1054038).
    
    The update package also includes non-security fixes. See advisory for
    details.
    
    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."
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://bugzilla.suse.com/show_bug.cgi?id=1046882"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://bugzilla.suse.com/show_bug.cgi?id=1054038"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://bugzilla.suse.com/show_bug.cgi?id=513804"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://bugzilla.suse.com/show_bug.cgi?id=693890"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://www.suse.com/security/cve/CVE-2012-6706/"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://www.suse.com/security/cve/CVE-2017-12938/"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://www.suse.com/security/cve/CVE-2017-12940/"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://www.suse.com/security/cve/CVE-2017-12941/"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://www.suse.com/security/cve/CVE-2017-12942/"
      );
      # https://www.suse.com/support/update/announcement/2018/suse-su-20180862-1/
      script_set_attribute(
        attribute:"see_also",
        value:"http://www.nessus.org/u?183f5d82"
      );
      script_set_attribute(
        attribute:"solution", 
        value:
    "To install this SUSE Security Update use the SUSE recommended
    installation methods like YaST online_update or 'zypper patch'.
    
    Alternatively you can run the command listed for your product :
    
    SUSE Linux Enterprise Server 11-SP4:zypper in -t patch
    slessp4-unrar-13542=1
    
    SUSE Linux Enterprise Debuginfo 11-SP4:zypper in -t patch
    dbgsp4-unrar-13542=1"
      );
      script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
      script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
      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_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
      script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
      script_set_attribute(attribute:"exploit_available", value:"false");
    
      script_set_attribute(attribute:"plugin_type", value:"local");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:unrar");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:11");
    
      script_set_attribute(attribute:"vuln_publication_date", value:"2017/06/22");
      script_set_attribute(attribute:"patch_publication_date", value:"2018/04/03");
      script_set_attribute(attribute:"plugin_publication_date", value:"2018/04/04");
      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:"SuSE Local Security Checks");
    
      script_dependencies("ssh_get_info.nasl");
      script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/SuSE/release", "Host/SuSE/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/SuSE/release");
    if (isnull(release) || release !~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "SUSE");
    os_ver = pregmatch(pattern: "^(SLE(S|D)\d+)", string:release);
    if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "SUSE");
    os_ver = os_ver[1];
    if (! preg(pattern:"^(SLES11)$", string:os_ver)) audit(AUDIT_OS_NOT, "SUSE SLES11", "SUSE " + os_ver);
    
    if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
    
    cpu = get_kb_item("Host/cpu");
    if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
    if (cpu !~ "^i[3-6]86$" && "x86_64" >!< cpu && "s390x" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "SUSE " + os_ver, cpu);
    
    sp = get_kb_item("Host/SuSE/patchlevel");
    if (isnull(sp)) sp = "0";
    if (os_ver == "SLES11" && (! preg(pattern:"^(4)$", string:sp))) audit(AUDIT_OS_NOT, "SLES11 SP4", os_ver + " SP" + sp);
    
    
    flag = 0;
    if (rpm_check(release:"SLES11", sp:"4", reference:"unrar-5.6.1-5.3.1")) flag++;
    
    
    if (flag)
    {
      if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
      else security_hole(0);
      exit(0);
    }
    else
    {
      tested = pkg_tests_get();
      if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
      else audit(AUDIT_PACKAGE_NOT_INSTALLED, "unrar");
    }
    
  • NASL familyGentoo Local Security Checks
    NASL idGENTOO_GLSA-201709-24.NASL
    descriptionThe remote host is affected by the vulnerability described in GLSA-201709-24 (RAR, UnRAR: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in RAR and UnRAR. Please review the referenced CVE identifiers for details. Impact : A remote attacker, by enticing a user to open a specially crafted RAR, could possibly execute arbitrary code with the privileges of the process or cause a Denial of Service condition. Workaround : There is no known workaround at this time.
    last seen2020-06-01
    modified2020-06-02
    plugin id103463
    published2017-09-26
    reporterThis script is Copyright (C) 2017-2018 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/103463
    titleGLSA-201709-24 : RAR, UnRAR: Multiple vulnerabilities
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were
    # extracted from Gentoo Linux Security Advisory GLSA 201709-24.
    #
    # The advisory text is Copyright (C) 2001-2018 Gentoo Foundation, Inc.
    # and licensed under the Creative Commons - Attribution / Share Alike 
    # license. See http://creativecommons.org/licenses/by-sa/3.0/
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(103463);
      script_version("$Revision: 3.3 $");
      script_cvs_date("$Date: 2018/01/26 17:15:57 $");
    
      script_cve_id("CVE-2012-6706", "CVE-2017-12940", "CVE-2017-12941", "CVE-2017-12942");
      script_xref(name:"GLSA", value:"201709-24");
    
      script_name(english:"GLSA-201709-24 : RAR, UnRAR: Multiple vulnerabilities");
      script_summary(english:"Checks for updated package(s) in /var/db/pkg");
    
      script_set_attribute(
        attribute:"synopsis", 
        value:
    "The remote Gentoo host is missing one or more security-related
    patches."
      );
      script_set_attribute(
        attribute:"description", 
        value:
    "The remote host is affected by the vulnerability described in GLSA-201709-24
    (RAR, UnRAR: Multiple vulnerabilities)
    
        Multiple vulnerabilities have been discovered in RAR and UnRAR. Please
          review the referenced CVE identifiers for details.
      
    Impact :
    
        A remote attacker, by enticing a user to open a specially crafted RAR,
          could possibly execute arbitrary code with the privileges of the process
          or cause a Denial of Service condition.
      
    Workaround :
    
        There is no known workaround at this time."
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://security.gentoo.org/glsa/201709-24"
      );
      script_set_attribute(
        attribute:"solution", 
        value:
    "All RAR users should upgrade to the latest version:
          # emerge --sync
          # emerge --ask --oneshot --verbose '>=app-arch/rar-5.5.0_p20170811'
        All UnRAR users should upgrade to the latest version:
          # emerge --sync
          # emerge --ask --oneshot --verbose '>=app-arch/unrar-5.5.7'"
      );
      script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
      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:gentoo:linux:rar");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:unrar");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");
    
      script_set_attribute(attribute:"patch_publication_date", value:"2017/09/25");
      script_set_attribute(attribute:"plugin_publication_date", value:"2017/09/26");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_copyright(english:"This script is Copyright (C) 2017-2018 Tenable Network Security, Inc.");
      script_family(english:"Gentoo Local Security Checks");
    
      script_dependencies("ssh_get_info.nasl");
      script_require_keys("Host/local_checks_enabled", "Host/Gentoo/release", "Host/Gentoo/qpkg-list");
    
      exit(0);
    }
    
    
    include("audit.inc");
    include("global_settings.inc");
    include("qpkg.inc");
    
    if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
    if (!get_kb_item("Host/Gentoo/release")) audit(AUDIT_OS_NOT, "Gentoo");
    if (!get_kb_item("Host/Gentoo/qpkg-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
    
    
    flag = 0;
    
    if (qpkg_check(package:"app-arch/unrar", unaffected:make_list("ge 5.5.7"), vulnerable:make_list("lt 5.5.7"))) flag++;
    if (qpkg_check(package:"app-arch/rar", unaffected:make_list("ge 5.5.0_p20170811"), vulnerable:make_list("lt 5.5.0_p20170811"))) flag++;
    
    if (flag)
    {
      if (report_verbosity > 0) security_hole(port:0, extra:qpkg_report_get());
      else security_hole(0);
      exit(0);
    }
    else
    {
      tested = qpkg_tests_get();
      if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
      else audit(AUDIT_PACKAGE_NOT_INSTALLED, "RAR / UnRAR");
    }