The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2018-3073 advisory.

    - fix defects detected by Coverity related to CVE-2017-18206 and CVE-2018-1083
    - fix stack-based buffer overflow in utils.c:checkmailpath() (CVE-2018-1100)
    - fix stack-based buffer overflow in gen_matches_files() (CVE-2018-1083)
    - fix stack-based buffer overflow in exec.c:hashcmd() (CVE-2018-1071)
    - avoid crash when copying empty hash table (CVE-2018-7549)
    - fix buffer overrun in xsymlinks (CVE-2017-18206)
    - fix NULL dereference in cd (CVE-2017-18205)
    - fix buffer overflow when scanning very long path for symlinks (CVE-2014-10072)
    - fix buffer overflow for very long fds in >& fd syntax (CVE-2014-10071)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3593-1 advisory.

    It 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)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

NULL 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)

The remote SUSE Linux SLES11 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2022:14910-1 advisory.

  - 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     env_reset has been disabled. (CVE-2014-10070)

  - In exec.c in zsh before 5.0.7, there is a buffer overflow for very long fds in the >& fd syntax.
    (CVE-2014-10071)

  - In utils.c in zsh before 5.0.6, there is a buffer overflow when scanning very long directory paths for     symbolic links. (CVE-2014-10072)

  - In zsh before 5.3, an off-by-one error resulted in undersized buffers that were intended to support     PATH_MAX characters. (CVE-2016-10714)

  - 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)

  - In utils.c in zsh before 5.4, symlink expansion had a buffer overflow. (CVE-2017-18206)

  - An issue was discovered in zsh before 5.6. The beginning of a #! script file was mishandled, potentially     leading to an execve call to a program named on the second line. (CVE-2018-0502)

  - 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)

  - Zsh before version 5.4.2-test-1 is vulnerable to a buffer overflow in the shell autocomplete     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 autocomplete to traverse the before mentioned path.
    If the user affected is privileged, this leads to privilege escalation. (CVE-2018-1083)

  - An issue was discovered in zsh before 5.6. Shebang lines exceeding 64 characters were truncated,     potentially leading to an execve call to a program name that is a substring of the intended one.
    (CVE-2018-13259)

  - 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)

  - 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)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According 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.

New zsh packages are available for Slackware 14.0, 14.1, and 14.2 to fix security issues.

The 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.

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.

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 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 '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)

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 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)

ID	Name	Product	Family	Published	Updated	Severity
118769	Oracle Linux 7 : zsh (ELSA-2018-3073)	Nessus	Oracle Linux Local Security Checks	11/7/2018	10/22/2024	critical
107257	Ubuntu 14.04 LTS / 16.04 LTS : Zsh vulnerabilities (USN-3593-1)	Nessus	Ubuntu Local Security Checks	3/9/2018	9/3/2025	critical
109139	Amazon Linux 2 : zsh (ALAS-2018-986)	Nessus	Amazon Linux Local Security Checks	4/18/2018	10/30/2024	critical
159025	SUSE SLES11 Security Update : zsh (SUSE-SU-2022:14910-1)	Nessus	SuSE Local Security Checks	3/17/2022	7/14/2023	critical
119524	EulerOS 2.0 SP3 : zsh (EulerOS-SA-2018-1396)	Nessus	Huawei Local Security Checks	12/10/2018	7/16/2024	critical
121145	Slackware 14.0 / 14.1 / 14.2 : zsh (SSA:2019-013-01)	Nessus	Slackware Local Security Checks	1/14/2019	6/27/2024	critical
110174	GLSA-201805-10 : Zsh: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	5/29/2018	9/30/2024	critical
118989	CentOS 7 : zsh (CESA-2018:3073)	Nessus	CentOS Local Security Checks	11/16/2018	7/22/2024	critical
119466	Amazon Linux AMI : zsh (ALAS-2018-1107)	Nessus	Amazon Linux Local Security Checks	12/7/2018	7/17/2024	critical

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