Vulnerabilities > CVE-2019-14868 - Command Injection vulnerability in multiple products
Attack vector
LOCAL Attack complexity
LOW Privileges required
LOW Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
In ksh version 20120801, a flaw was found in the way it evaluates certain environment variables. An attacker could use this flaw to override or bypass environment restrictions to execute shell commands. Services and applications that allow remote unauthenticated attackers to provide one of those environment variables could allow them to exploit this issue remotely.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Cause Web Server Misclassification An attack of this type exploits a Web server's decision to take action based on filename or file extension. Because different file types are handled by different server processes, misclassification may force the Web server to take unexpected action, or expected actions in an unexpected sequence. This may cause the server to exhaust resources, supply debug or system data to the attacker, or bind an attacker to a remote process. This type of vulnerability has been found in many widely used servers including IIS, Lotus Domino, and Orion. The attacker's job in this case is straightforward, standard communication protocols and methods are used and are generally appended with malicious information at the tail end of an otherwise legitimate request. The attack payload varies, but it could be special characters like a period or simply appending a tag that has a special meaning for operations on the server side like .jsp for a java application server. The essence of this attack is that the attacker deceives the server into executing functionality based on the name of the request, i.e. login.jsp, not the contents.
- LDAP Injection An attacker manipulates or crafts an LDAP query for the purpose of undermining the security of the target. Some applications use user input to create LDAP queries that are processed by an LDAP server. For example, a user might provide their username during authentication and the username might be inserted in an LDAP query during the authentication process. An attacker could use this input to inject additional commands into an LDAP query that could disclose sensitive information. For example, entering a * in the aforementioned query might return information about all users on the system. This attack is very similar to an SQL injection attack in that it manipulates a query to gather additional information or coerce a particular return value.
- Command Delimiters An attack of this type exploits a programs' vulnerabilities that allows an attacker's commands to be concatenated onto a legitimate command with the intent of targeting other resources such as the file system or database. The system that uses a filter or a blacklist input validation, as opposed to whitelist validation is vulnerable to an attacker who predicts delimiters (or combinations of delimiters) not present in the filter or blacklist. As with other injection attacks, the attacker uses the command delimiter payload as an entry point to tunnel through the application and activate additional attacks through SQL queries, shell commands, network scanning, and so on.
- File System Function Injection, Content Based An attack of this type exploits the host's trust in executing remote content including binary files. The files are poisoned with a malicious payload (targeting the file systems accessible by the target software) by the attacker and may be passed through standard channels such as via email, and standard web content like PDF and multimedia files. The attacker exploits known vulnerabilities or handling routines in the target processes. Vulnerabilities of this type have been found in a wide variety of commercial applications from Microsoft Office to Adobe Acrobat and Apple Safari web browser. When the attacker knows the standard handling routines and can identify vulnerabilities and entry points they can be exploited by otherwise seemingly normal content. Once the attack is executed, the attackers' program can access relative directories such as C:\Program Files or other standard system directories to launch further attacks. In a worst case scenario, these programs are combined with other propagation logic and work as a virus.
- Exploiting Multiple Input Interpretation Layers An attacker supplies the target software with input data that contains sequences of special characters designed to bypass input validation logic. This exploit relies on the target making multiples passes over the input data and processing a "layer" of special characters with each pass. In this manner, the attacker can disguise input that would otherwise be rejected as invalid by concealing it with layers of special/escape characters that are stripped off by subsequent processing steps. The goal is to first discover cases where the input validation layer executes before one or more parsing layers. That is, user input may go through the following logic in an application: In such cases, the attacker will need to provide input that will pass through the input validator, but after passing through parser2, will be converted into something that the input validator was supposed to stop.
Nessus
NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2020-2210.NASL description The remote Redhat Enterprise Linux 7 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2020:2210 advisory. - ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection (CVE-2019-14868) Note that Nessus has not tested for this issue but has instead relied only on the application last seen 2020-05-31 modified 2020-05-20 plugin id 136713 published 2020-05-20 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/136713 title RHEL 7 : ksh (RHSA-2020:2210) code # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from Red Hat Security Advisory RHSA-2020:2210. The text # itself is copyright (C) Red Hat, Inc. # include('compat.inc'); if (description) { script_id(136713); script_version("1.2"); script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/27"); script_cve_id("CVE-2019-14868"); script_xref(name:"RHSA", value:"2020:2210"); script_name(english:"RHEL 7 : ksh (RHSA-2020:2210)"); script_summary(english:"Checks the rpm output for the updated package"); script_set_attribute(attribute:"synopsis", value: "The remote Red Hat host is missing a security update."); script_set_attribute(attribute:"description", value: "The remote Redhat Enterprise Linux 7 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2020:2210 advisory. - ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection (CVE-2019-14868) Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number."); script_set_attribute(attribute:"see_also", value:"https://cwe.mitre.org/data/definitions/77.html"); script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2020:2210"); script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2019-14868"); script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/1757324"); script_set_attribute(attribute:"solution", value: "Update the affected ksh package."); script_set_cvss_base_vector("CVSS2#AV:L/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:L/AC:L/PR:L/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:"cvss_score_source", value:"CVE-2019-14868"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_cwe_id(77); script_set_attribute(attribute:"vuln_publication_date", value:"2020/04/02"); script_set_attribute(attribute:"patch_publication_date", value:"2020/05/19"); script_set_attribute(attribute:"plugin_publication_date", value:"2020/05/20"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.4"); script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_aus:7.4"); script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_aus:7.4::server"); script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_e4s:7.4"); script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_e4s:7.4::server"); script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_tus:7.4"); script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_tus:7.4::server"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ksh"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"Red Hat Local Security Checks"); script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu"); 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) || 'Red Hat' >!< release) audit(AUDIT_OS_NOT, 'Red Hat'); os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:release); if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat'); os_ver = os_ver[1]; if (! preg(pattern:"^7\.4([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'Red Hat 7.4', 'Red Hat ' + os_ver); if (!get_kb_item('Host/RedHat/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING); cpu = get_kb_item('Host/cpu'); if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH); if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu); pkgs = [ {'reference':'ksh-20120801-36.el7_4', 'sp':'4', 'cpu':'x86_64', 'release':'7', 'el_string':'el7_4', 'rpm_spec_vers_cmp':TRUE} ]; flag = 0; foreach package_array ( pkgs ) { reference = NULL; release = NULL; sp = NULL; cpu = NULL; el_string = NULL; rpm_spec_vers_cmp = NULL; epoch = NULL; if (!empty_or_null(package_array['reference'])) reference = package_array['reference']; if (!empty_or_null(package_array['release'])) release = 'RHEL' + package_array['release']; if (!empty_or_null(package_array['sp'])) sp = package_array['sp']; if (!empty_or_null(package_array['cpu'])) cpu = package_array['cpu']; if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string']; if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp']; if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch']; if (reference && release) { if (rpm_check(release:release, sp:sp, cpu:cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp)) flag++; } } if (flag) { security_report_v4( port : 0, severity : SECURITY_HOLE, extra : rpm_report_get() + redhat_report_package_caveat() ); exit(0); } else { tested = pkg_tests_get(); if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested); else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'ksh'); }NASL family CentOS Local Security Checks NASL id CENTOS_RHSA-2020-0568.NASL description An update for ksh is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Important. 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. KornShell (ksh) is a Unix shell developed by AT&T Bell Laboratories, which is backward-compatible with the Bourne shell (sh) and includes many features of the C shell. The most recent version is KSH-93. KornShell complies with the POSIX.2 standard (IEEE Std 1003.2-1992). Security Fix(es) : * ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection (CVE-2019-14868) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. last seen 2020-04-09 modified 2020-02-27 plugin id 134088 published 2020-02-27 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/134088 title CentOS 7 : ksh (CESA-2020:0568) code # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from Red Hat Security Advisory RHSA-2020:0568 and # CentOS Errata and Security Advisory 2020:0568 respectively. # include("compat.inc"); if (description) { script_id(134088); script_version("1.3"); script_set_attribute(attribute:"plugin_modification_date", value:"2020/04/08"); script_cve_id("CVE-2019-14868"); script_xref(name:"RHSA", value:"2020:0568"); script_name(english:"CentOS 7 : ksh (CESA-2020:0568)"); script_summary(english:"Checks rpm output for the updated package"); script_set_attribute( attribute:"synopsis", value:"The remote CentOS host is missing a security update." ); script_set_attribute( attribute:"description", value: "An update for ksh is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Important. 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. KornShell (ksh) is a Unix shell developed by AT&T Bell Laboratories, which is backward-compatible with the Bourne shell (sh) and includes many features of the C shell. The most recent version is KSH-93. KornShell complies with the POSIX.2 standard (IEEE Std 1003.2-1992). Security Fix(es) : * ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection (CVE-2019-14868) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section." ); # https://lists.centos.org/pipermail/centos-announce/2020-February/035647.html script_set_attribute( attribute:"see_also", value:"http://www.nessus.org/u?fcda7f48" ); script_set_attribute(attribute:"solution", value:"Update the affected ksh package."); script_set_cvss_base_vector("CVSS2#AV:L/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:L/AC:L/PR:L/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:"cvss_score_source", value:"CVE-2019-14868"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:ksh"); script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7"); script_set_attribute(attribute:"vuln_publication_date", value:"2020/04/02"); script_set_attribute(attribute:"patch_publication_date", value:"2020/02/26"); script_set_attribute(attribute:"plugin_publication_date", value:"2020/02/27"); script_set_attribute(attribute:"generated_plugin", value:"current"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2020 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:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 7.x", "CentOS " + os_ver); if (!get_kb_item("Host/CentOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING); cpu = get_kb_item("Host/cpu"); if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH); if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "CentOS", cpu); flag = 0; if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"ksh-20120801-140.el7_7")) 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, "ksh"); }NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2020-0431.NASL description An update for ksh is now available for Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Important. 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. KornShell (ksh) is a Unix shell developed by AT&T Bell Laboratories, which is backward-compatible with the Bourne shell (sh) and includes many features of the C shell. The most recent version is KSH-93. KornShell complies with the POSIX.2 standard (IEEE Std 1003.2-1992). Security Fix(es) : * ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection (CVE-2019-14868) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. last seen 2020-06-01 modified 2020-06-02 plugin id 133516 published 2020-02-06 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/133516 title RHEL 8 : ksh (RHSA-2020:0431) code # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from Red Hat Security Advisory RHSA-2020:0431. The text # itself is copyright (C) Red Hat, Inc. # include("compat.inc"); if (description) { script_id(133516); script_version("1.1"); script_cvs_date("Date: 2020/02/06"); script_cve_id("CVE-2019-14868"); script_xref(name:"RHSA", value:"2020:0431"); script_name(english:"RHEL 8 : ksh (RHSA-2020:0431)"); script_summary(english:"Checks the rpm output for the updated packages"); script_set_attribute( attribute:"synopsis", value:"The remote Red Hat host is missing one or more security updates." ); script_set_attribute( attribute:"description", value: "An update for ksh is now available for Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Important. 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. KornShell (ksh) is a Unix shell developed by AT&T Bell Laboratories, which is backward-compatible with the Bourne shell (sh) and includes many features of the C shell. The most recent version is KSH-93. KornShell complies with the POSIX.2 standard (IEEE Std 1003.2-1992). Security Fix(es) : * ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection (CVE-2019-14868) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section." ); script_set_attribute( attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2020:0431" ); script_set_attribute( attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2019-14868" ); script_set_attribute( attribute:"solution", value: "Update the affected ksh, ksh-debuginfo and / or ksh-debugsource packages." ); script_set_attribute(attribute:"risk_factor", value:"High"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ksh"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ksh-debuginfo"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ksh-debugsource"); script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8.0"); script_set_attribute(attribute:"patch_publication_date", value:"2020/02/05"); script_set_attribute(attribute:"plugin_publication_date", value:"2020/02/06"); script_set_attribute(attribute:"generated_plugin", value:"current"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof."); script_family(english:"Red Hat Local Security Checks"); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu"); 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) || "Red Hat" >!< release) audit(AUDIT_OS_NOT, "Red Hat"); os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:release); if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Red Hat"); os_ver = os_ver[1]; if (! preg(pattern:"^8\.0([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 8.0", "Red Hat " + os_ver); if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING); cpu = get_kb_item("Host/cpu"); if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH); if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "s390" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Red Hat", cpu); if ("x86_64" >!< cpu) audit(AUDIT_ARCH_NOT, "x86_64", cpu); yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo"); if (!empty_or_null(yum_updateinfo)) { rhsa = "RHSA-2020:0431"; yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa); if (!empty_or_null(yum_report)) { security_report_v4( port : 0, severity : SECURITY_HOLE, extra : yum_report ); exit(0); } else { audit_message = "affected by Red Hat security advisory " + rhsa; audit(AUDIT_OS_NOT, audit_message); } } else { flag = 0; if (rpm_check(release:"RHEL8", sp:"0", cpu:"x86_64", reference:"ksh-20120801-253.el8_0")) flag++; if (rpm_check(release:"RHEL8", sp:"0", cpu:"x86_64", reference:"ksh-debuginfo-20120801-253.el8_0")) flag++; if (rpm_check(release:"RHEL8", sp:"0", cpu:"x86_64", reference:"ksh-debugsource-20120801-253.el8_0")) flag++; if (flag) { security_report_v4( port : 0, severity : SECURITY_HOLE, extra : rpm_report_get() + redhat_report_package_caveat() ); exit(0); } else { tested = pkg_tests_get(); if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested); else audit(AUDIT_PACKAGE_NOT_INSTALLED, "ksh / ksh-debuginfo / ksh-debugsource"); } }NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2020-1332.NASL description The remote Redhat Enterprise Linux 7 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2020:1332 advisory. - ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection (CVE-2019-14868) Note that Nessus has not tested for this issue but has instead relied only on the application last seen 2020-04-23 modified 2020-04-06 plugin id 135234 published 2020-04-06 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/135234 title RHEL 7 : ksh (RHSA-2020:1332) code # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from Red Hat Security Advisory RHSA-2020:1332. The text # itself is copyright (C) Red Hat, Inc. # include('compat.inc'); if (description) { script_id(135234); script_version("1.2"); script_set_attribute(attribute:"plugin_modification_date", value:"2020/04/21"); script_cve_id("CVE-2019-14868"); script_xref(name:"RHSA", value:"2020:1332"); script_name(english:"RHEL 7 : ksh (RHSA-2020:1332)"); script_summary(english:"Checks the rpm output for the updated package"); script_set_attribute(attribute:"synopsis", value: "The remote Red Hat host is missing a security update."); script_set_attribute(attribute:"description", value: "The remote Redhat Enterprise Linux 7 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2020:1332 advisory. - ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection (CVE-2019-14868) Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number."); script_set_attribute(attribute:"see_also", value:"https://cwe.mitre.org/data/definitions/77.html"); script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2020:1332"); script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2019-14868"); script_set_attribute(attribute:"solution", value: "Update the affected ksh package."); script_set_cvss_base_vector("CVSS2#AV:L/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:L/AC:L/PR:L/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:"cvss_score_source", value:"CVE-2019-14868"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_cwe_id(77); script_set_attribute(attribute:"vuln_publication_date", value:"2020/04/02"); script_set_attribute(attribute:"patch_publication_date", value:"2020/04/06"); script_set_attribute(attribute:"plugin_publication_date", value:"2020/04/06"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.5"); script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_eus:7.5"); script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_eus:7.5::computenode"); script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_eus:7.5::server"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ksh"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"Red Hat Local Security Checks"); script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu"); 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) || 'Red Hat' >!< release) audit(AUDIT_OS_NOT, 'Red Hat'); os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:release); if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat'); os_ver = os_ver[1]; if (! preg(pattern:"^7\.5([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'Red Hat 7.5', 'Red Hat ' + os_ver); if (!get_kb_item('Host/RedHat/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING); cpu = get_kb_item('Host/cpu'); if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH); if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu); pkgs = [ {'reference':'ksh-20120801-138.el7_5', 'sp':'5', 'cpu':'s390x', 'release':'7'}, {'reference':'ksh-20120801-138.el7_5', 'sp':'5', 'cpu':'x86_64', 'release':'7'} ]; flag = 0; foreach package_array ( pkgs ) { reference = NULL; release = NULL; sp = NULL; cpu = NULL; el_string = NULL; rpm_spec_vers_cmp = NULL; epoch = NULL; if (!empty_or_null(package_array['reference'])) reference = package_array['reference']; if (!empty_or_null(package_array['release'])) release = 'RHEL' + package_array['release']; if (!empty_or_null(package_array['sp'])) sp = package_array['sp']; if (!empty_or_null(package_array['cpu'])) cpu = package_array['cpu']; if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string']; if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp']; if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch']; if (reference && release) { if (rpm_spec_vers_cmp) { if (rpm_check(release:release, sp:sp, cpu:cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:TRUE)) flag++; } else { if (rpm_check(release:release, sp:sp, cpu:cpu, reference:reference, epoch:epoch)) flag++; } } } if (flag) { security_report_v4( port : 0, severity : SECURITY_HOLE, extra : rpm_report_get() + redhat_report_package_caveat() ); exit(0); } else { tested = pkg_tests_get(); if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested); else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'ksh'); }NASL family Oracle Linux Local Security Checks NASL id ORACLELINUX_ELSA-2020-0515.NASL description From Red Hat Security Advisory 2020:0515 : An update for ksh is now available for Red Hat Enterprise Linux 6. Red Hat Product Security has rated this update as having a security impact of Important. 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. KornShell (ksh) is a Unix shell developed by AT&T Bell Laboratories, which is backward-compatible with the Bourne shell (sh) and includes many features of the C shell. The most recent version is KSH-93. KornShell complies with the POSIX.2 standard (IEEE Std 1003.2-1992). Security Fix(es) : * ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection (CVE-2019-14868) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. last seen 2020-04-10 modified 2020-02-19 plugin id 133780 published 2020-02-19 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/133780 title Oracle Linux 6 : ksh (ELSA-2020-0515) NASL family CentOS Local Security Checks NASL id CENTOS_RHSA-2020-0515.NASL description An update for ksh is now available for Red Hat Enterprise Linux 6. Red Hat Product Security has rated this update as having a security impact of Important. 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. KornShell (ksh) is a Unix shell developed by AT&T Bell Laboratories, which is backward-compatible with the Bourne shell (sh) and includes many features of the C shell. The most recent version is KSH-93. KornShell complies with the POSIX.2 standard (IEEE Std 1003.2-1992). Security Fix(es) : * ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection (CVE-2019-14868) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. last seen 2020-04-09 modified 2020-02-19 plugin id 133767 published 2020-02-19 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/133767 title CentOS 6 : ksh (CESA-2020:0515) NASL family Oracle Linux Local Security Checks NASL id ORACLELINUX_ELSA-2020-0568.NASL description From Red Hat Security Advisory 2020:0568 : An update for ksh is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Important. 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. KornShell (ksh) is a Unix shell developed by AT&T Bell Laboratories, which is backward-compatible with the Bourne shell (sh) and includes many features of the C shell. The most recent version is KSH-93. KornShell complies with the POSIX.2 standard (IEEE Std 1003.2-1992). Security Fix(es) : * ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection (CVE-2019-14868) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. last seen 2020-04-10 modified 2020-02-25 plugin id 134020 published 2020-02-25 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/134020 title Oracle Linux 7 : ksh (ELSA-2020-0568) NASL family Fedora Local Security Checks NASL id FEDORA_2020-D940ACA772.NASL description Do not evaluate arithmetic expressions from environment variables at startup 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 seen 2020-04-10 modified 2020-02-18 plugin id 133740 published 2020-02-18 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/133740 title Fedora 31 : 1:ksh (2020-d940aca772) NASL family NewStart CGSL Local Security Checks NASL id NEWSTART_CGSL_NS-SA-2020-0024_KSH.NASL description The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has ksh packages installed that are affected by a vulnerability: - In ksh version 20120801, a flaw was found in the way it evaluates certain environment variables. An attacker could use this flaw to override or bypass environment restrictions to execute shell commands. Services and applications that allow remote unauthenticated attackers to provide one of those environment variables could allow them to exploit this issue remotely. (CVE-2019-14868) Note that Nessus has not tested for this issue but has instead relied only on the application last seen 2020-06-05 modified 2020-05-27 plugin id 136902 published 2020-05-27 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/136902 title NewStart CGSL CORE 5.04 / MAIN 5.04 : ksh Vulnerability (NS-SA-2020-0024) NASL family Scientific Linux Local Security Checks NASL id SL_20200217_KSH_ON_SL6_X.NASL description Security Fix(es) : - ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection (CVE-2019-14868) last seen 2020-04-10 modified 2020-02-18 plugin id 133756 published 2020-02-18 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/133756 title Scientific Linux Security Update : ksh on SL6.x i386/x86_64 (20200217) NASL family Huawei Local Security Checks NASL id EULEROS_SA-2020-1583.NASL description According to the version of the ksh package installed, the EulerOS installation on the remote host is affected by the following vulnerability : - In ksh version 20120801, a flaw was found in the way it evaluates certain environment variables. An attacker could use this flaw to override or bypass environment restrictions to execute shell commands. Services and applications that allow remote unauthenticated attackers to provide one of those environment variables could allow them to exploit this issue remotely.(CVE-2019-14868) 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 seen 2020-05-31 modified 2020-05-26 plugin id 136861 published 2020-05-26 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/136861 title EulerOS 2.0 SP8 : ksh (EulerOS-SA-2020-1583) NASL family Scientific Linux Local Security Checks NASL id SL_20200224_KSH_ON_SL7_X.NASL description Security Fix(es) : ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection (CVE-2019-14868) last seen 2020-04-10 modified 2020-02-26 plugin id 134069 published 2020-02-26 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/134069 title Scientific Linux Security Update : ksh on SL7.x x86_64 (20200224) NASL family MacOS X Local Security Checks NASL id MACOS_HT211170.NASL description The remote host is running a version of macOS / Mac OS X that is 10.15.x prior to 10.15.5, 10.13.x prior to 10.13.6 Security Update 2020-003, 10.14.x prior to 10.14.6 Security Update 2020-003. It is, therefore, affected by multiple vulnerabilities: - In ksh version 20120801, a flaw was found in the way it evaluates certain environment variables. An attacker could use this flaw to override or bypass environment restrictions to execute shell commands. Services and applications that allow remote unauthenticated attackers to provide one of those environment variables could allow them to exploit this issue remotely. (CVE-2019-14868) - In Zsh before 5.8, attackers able to execute commands can regain privileges dropped by the --no-PRIVILEGED option. Zsh fails to overwrite the saved uid, so the original privileges can be restored by executing MODULE_PATH=/dir/with/module zmodload with a module that calls setuid(). (CVE-2019-20044) - An out-of-bounds read was addressed with improved input validation. This issue is fixed in iOS 13.3.1 and iPadOS 13.3.1, macOS Catalina 10.15.3, tvOS 13.3.1, watchOS 6.1.2. Processing a maliciously crafted image may lead to arbitrary code execution. (CVE-2020-3878) Note that Nessus has not tested for this issue but has instead relied only on the operating system last seen 2020-06-12 modified 2020-05-28 plugin id 136930 published 2020-05-28 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/136930 title macOS 10.15.x < 10.15.5 / 10.14.x < 10.14.6 Security Update 2020-003 / 10.13.x < 10.13.6 Security Update 2020-003 NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2020-0568.NASL description An update for ksh is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Important. 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. KornShell (ksh) is a Unix shell developed by AT&T Bell Laboratories, which is backward-compatible with the Bourne shell (sh) and includes many features of the C shell. The most recent version is KSH-93. KornShell complies with the POSIX.2 standard (IEEE Std 1003.2-1992). Security Fix(es) : * ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection (CVE-2019-14868) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. last seen 2020-06-01 modified 2020-06-02 plugin id 134025 published 2020-02-25 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/134025 title RHEL 7 : ksh (RHSA-2020:0568) NASL family FreeBSD Local Security Checks NASL id FREEBSD_PKG_8B20D71649DF11EA9F7B206A8A720317.NASL description Upstream ksh93 maintainer Siteshwar Vashisht reports : A flaw was found in the way ksh evaluates certain environment variables. An attacker could use this flaw to override or bypass environment restrictions to execute shell commands. Services and applications that allow remote unauthenticated attackers to provide one of those environment variables could allow them to exploit this issue remotely. last seen 2020-04-04 modified 2020-02-10 plugin id 133588 published 2020-02-10 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/133588 title FreeBSD : ksh93 -- certain environment variables interpreted as arithmetic expressions on startup, leading to code injection (8b20d716-49df-11ea-9f7b-206a8a720317) NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2020-0515.NASL description An update for ksh is now available for Red Hat Enterprise Linux 6. Red Hat Product Security has rated this update as having a security impact of Important. 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. KornShell (ksh) is a Unix shell developed by AT&T Bell Laboratories, which is backward-compatible with the Bourne shell (sh) and includes many features of the C shell. The most recent version is KSH-93. KornShell complies with the POSIX.2 standard (IEEE Std 1003.2-1992). Security Fix(es) : * ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection (CVE-2019-14868) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. last seen 2020-06-01 modified 2020-06-02 plugin id 133750 published 2020-02-18 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/133750 title RHEL 6 : ksh (RHSA-2020:0515) NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2020-0559.NASL description An update for ksh is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Important. 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. KornShell (ksh) is a Unix shell developed by AT&T Bell Laboratories, which is backward-compatible with the Bourne shell (sh) and includes many features of the C shell. The most recent version is KSH-93. KornShell complies with the POSIX.2 standard (IEEE Std 1003.2-1992). Security Fix(es) : * ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection (CVE-2019-14868) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. last seen 2020-06-01 modified 2020-06-02 plugin id 133941 published 2020-02-24 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/133941 title RHEL 8 : ksh (RHSA-2020:0559) NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2020-1333.NASL description The remote Redhat Enterprise Linux 7 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2020:1333 advisory. - ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection (CVE-2019-14868) Note that Nessus has not tested for this issue but has instead relied only on the application last seen 2020-04-23 modified 2020-04-06 plugin id 135232 published 2020-04-06 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/135232 title RHEL 7 : ksh (RHSA-2020:1333) NASL family Fedora Local Security Checks NASL id FEDORA_2020-A0F0EB8500.NASL description Do not evaluate arithmetic expressions from environment variables at startup 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 seen 2020-04-10 modified 2020-02-18 plugin id 133739 published 2020-02-18 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/133739 title Fedora 30 : 1:ksh (2020-a0f0eb8500)
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