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 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.

According 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     '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 'i1/4zi1/4+ fd'     syntax.(CVE-2014-10071)

  - 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)

  - 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)

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.

The remote MiracleLinux 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the AXSA:2018-3420:01 advisory.

    * zsh: Stack-based buffer overflow in gen_matches_files() at compctl.c (CVE-2018-1083)
      * zsh: buffer overflow for very long fds in >

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

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

- 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.

This 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.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:3073 advisory.

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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.

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 >&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)

The 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's self-reported version number.

ID	名前	製品	ファミリー	公開日	更新日	深刻度
109139	Amazon Linux 2 : zsh (ALAS-2018-986)	Nessus	Amazon Linux Local Security Checks	2018/4/18	2024/10/30	critical
118769	Oracle Linux 7 : zsh (ELSA-2018-3073)	Nessus	Oracle Linux Local Security Checks	2018/11/7	2024/10/22	critical
109489	EulerOS 2.0 SP2 : zsh (EulerOS-SA-2018-1091)	Nessus	Huawei Local Security Checks	2018/5/2	2024/10/15	critical
289489	MiracleLinux 7 : zsh-5.0.2-31.el7 (AXSA:2018-3420:01)	Nessus	Miracle Linux Local Security Checks	2026/1/16	2026/1/16	critical
108506	Fedora 26 : zsh (2018-9cdf18a850)	Nessus	Fedora Local Security Checks	2018/3/21	2024/12/19	critical
109384	openSUSE Security Update : zsh (openSUSE-2018-399)	Nessus	SuSE Local Security Checks	2018/4/27	2024/10/22	critical
118524	RHEL 7 : zsh (RHSA-2018:3073)	Nessus	Red Hat Local Security Checks	2018/10/31	2025/4/15	critical
119204	Scientific Linux Security Update : zsh on SL7.x x86_64 (20181030)	Nessus	Scientific Linux Local Security Checks	2018/11/27	2024/7/18	critical
127273	NewStart CGSL CORE 5.04 / MAIN 5.04 : zsh Multiple Vulnerabilities (NS-SA-2019-0070)	Nessus	NewStart CGSL Local Security Checks	2019/8/12	2021/1/14	critical

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