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.

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.

The remote SUSE Linux SLES12 / SLES_SAP12 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2022:0161-1 advisory.

  - 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)

  - 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)

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

Several security vulnerabilities were found and corrected in zsh, a powerful shell and scripting language. Off-by-one errors, wrong parsing of shebang lines and buffer overflows may lead to unexpected behavior. A local, unprivileged user can create a specially crafted message file or directory path. If the receiving user is privileged or traverses the aforementioned path, this leads to privilege escalation.

For Debian 9 stretch, these problems have been fixed in version 5.3.1-4+deb9u4.

We recommend that you upgrade your zsh packages.

For the detailed security status of zsh please refer to its security tracker page at: https://security-tracker.debian.org/tracker/zsh

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the zsh package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - 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)

  - 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)

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.

According to the versions of the zsh package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - 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)

  - 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)

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.

According to the versions of the zsh package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - 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 through version 5.4.2 is vulnerable to a     stack-based buffer overflow in the     utils.c:checkmailpath function. A local attacker could     exploit this to execute arbitrary code in the context     of another user.(CVE-2018-1100)

  - 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)

  - 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)

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.

An update of the zsh package has been released.

This update for zsh to version 5.6 fixes the following security issues :

  - CVE-2018-0502: The beginning of a #! script file was     mishandled, potentially leading to an execve call to a     program named on the second line (bsc#1107296).

  - CVE-2018-13259: 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     (bsc#1107294).

This update was imported from the SUSE:SLE-15:Update update project.

The remote host is affected by the vulnerability described in GLSA-201903-02 (Zsh: User-assisted execution of arbitrary code)

    Two input validation errors have been discovered in how Zsh parses       scripts:
      Parsing a malformed shebang line could cause Zsh to call a program         listed in the second line (CVE-2018-0502)       Shebang lines longer than 64 characters are truncated         (CVE-2018-13259)   Impact :

    An attacker could entice a user to execute a specially crafted script       using Zsh, possibly resulting in execution of arbitrary code with the       privileges of the process.
  Workaround :

    There is no known workaround at this time.

- fix two security issues in shebang line parsing     (CVE-2018-0502 CVE-2018-13259)

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 to version 5.6 fixes the following security issues :

CVE-2018-0502: The beginning of a #! script file was mishandled, potentially leading to an execve call to a program named on the second line (bsc#1107296).

CVE-2018-13259: 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 (bsc#1107294).

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.

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)

It was discovered that zsh does not properly validate the shebang of input files and it truncates it to the first 64 bytes. A local attacker may use this flaw to make zsh execute a different binary than what is expected, named with a substring of the shebang one.(CVE-2018-13259)

This update for zsh to version 5.6.2 fixes the following issues :

These security issues were fixed :

  - CVE-2018-0502: The beginning of a #! script file was     mishandled, potentially leading to an execve call to a     program named on the second line (bsc#1107296)

  - CVE-2018-13259: 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     (bsc#1107294)

  - CVE-2018-1100: Prevent stack-based buffer overflow in     the utils.c:checkmailpath function that allowed local     attackers to execute arbitrary code in the context of     another user (bsc#1089030).

  - CVE-2018-1071: Prevent stack-based buffer overflow in     the exec.c:hashcmd() function that allowed local     attackers to cause a denial of service (bsc#1084656).

  - CVE-2018-1083: Prevent buffer overflow in the shell     autocomplete functionality that allowed local     unprivileged users to create a specially crafted     directory path which lead to code execution in the     context of the user who tries to use autocomplete to     traverse the mentioned path (bsc#1087026).

  - Disallow evaluation of the initial values of integer     variables imported from the environment

These non-security issues were fixed :

  - Fixed that the signal SIGWINCH was being ignored when     zsh is not in the foreground.

  - Fixed two regressions with pipelines getting     backgrounded and emitting the signal SIGTTOU

  - The effect of the NO_INTERACTIVE_COMMENTS option extends     into $(...) and `...` command substitutions when used on     the command line.

  - The 'exec' and 'command' precommand modifiers, and     options to them, are now parsed after parameter     expansion.

  - Functions executed by ZLE widgets no longer have their     standard input closed, but redirected from /dev/null     instead.

  - There is an option WARN_NESTED_VAR, a companion to the     existing WARN_CREATE_GLOBAL that causes a warning if a     function updates a variable from an enclosing scope     without using typeset -g.

  - zmodload now has an option -s to be silent on a failure     to find a module but still print other errors.

  - Fix typo in chflags completion

  - Fixed invalid git commands completion

  - VCS info system: vcs_info git: Avoid a fork.

  - Fix handling of 'printf -' and 'printf --'

  - fix broken completion for filterdiff (boo#1019130)

  - Unicode9 support, this needs support from your terminal     to work correctly.

  - The new word modifier ':P' computes the physical path of     the argument.

  - The output of 'typeset -p' uses 'export' commands or the     '-g' option for parameters that are not local to the     current scope.

  - vi-repeat-change can repeat user-defined widgets if the     widget calls zle -f vichange.

  - The parameter $registers now makes the contents of vi     register buffers available to user-defined widgets.

  - New vi-up-case and vi-down-case builtin widgets bound to     gU/gu (or U/u in visual mode) for doing case conversion.

  - A new select-word-match function provides vim-style text     objects with configurable word boundaries using the     existing match-words-by-style mechanism.

  - Support for the conditional expression [[ -v var ]] to     test if a variable is set for compatibility with other     shells.

  - The print and printf builtins have a new option -v to     assign the output to a variable.

  - New x: syntax in completion match specifications make it     possible to disable match specifications hardcoded in     completion functions.

  - Re-add custom zshrc and zshenv to unbreak compatibility     with old usage (boo#998858).

  - Read /etc/profile as zsh again. 

  - The new module zsh/param/private can be loaded to allow     the shell to define parameters that are private to a     function scope (i.e. are not propagated to nested     functions called within this function).

  - The GLOB_STAR_SHORT option allows the pattern **/* to be     shortened to just ** if no / follows. so **.c searches     recursively for a file whose name has the suffix '.c'.

  - The effect of the WARN_CREATE_GLOBAL option has been     significantly extended, so expect it to cause additional     warning messages about parameters created globally     within function scope.

  - The print builtin has new options -x and -X to expand     tabs.

  - Several new command completions and numerous updates to     others.

  - Options to 'fc' to segregate internal and shared     history.

  - All emulations including 'sh' use multibyte by default;
    several repairs to multibyte handling.

  - ZLE supports 'bracketed paste' mode to avoid     interpreting pasted newlines as accept-line. Pastes can     be highlighted for visibility and to make it more     obvious whether accept-line has occurred.

  - Improved (though still not perfect) POSIX compatibility     for getopts builtin when POSIX_BUILTINS is set.

  - New setopt APPEND_CREATE for POSIX-compatible NO_CLOBBER     behavior.

  - Completion of date values now displays in a calendar     format when the complist module is available.
    Controllable by zstyle.

  - New parameter UNDO_LIMIT_NO for more control over ZLE     undo repeat.

  - Several repairs/improvements to the contributed     narrow-to-region ZLE function.

  - Many changes to child-process and signal handling to     eliminate race conditions and avoid deadlocks on     descriptor and memory management.

  - New builtin sysopen in zsh/system module for detailed     control of file descriptor modes. 

  - Fix a printf regression boo#934175 

  - Global aliases can be created for syntactic tokens such     as command separators (';', '&', '|', '&&', '||'),     redirection operators, etc.

  - There have been various further improvements to builtin     handling with the POSIX_BUILTINS option (off by default)     for compatibility with the POSIX standard.

  - 'whence -v' is now more informative, and 'whence -S'     shows you how a full chain of symbolic links resolves to     a command.

  - The 'p' parameter flag now allows an argument to be     specified as a reference to a variable, e.g.
    $((ps.$sep.)foo) to split $foo on a string given by     $sep.

  - The option FORCE_FLOAT now forces variables, not just     constants, to floating point in arithmetic expressions.

  - The type of an assignment in arithmetic expressions,     e.g. the type seen by the variable res in $(( res = a =     b )), is now more logical and C-like.

  - The default binding of 'u' in vi command mode has     changed to undo multiple changes when invoked     repeatedly. '^R' is now bound to redo changes. To revert     to toggling of the last edit use: bindkey -a u     vi-undo-change

  - Compatibility with Vim has been improved for vi editing     mode. Most notably, Vim style text objects are supported     and the region can be manipulated with vi commands in     the same manner as Vim's visual mode.

  - Elements of the watch variable may now be patterns.

  - The logic for retrying history locking has been     improved.

  - Fix openSUSE versions in osc completion

  - Add back rpm completion file (boo#900424)

It was discovered that Zsh incorrectly handled certain scripts. An attacker could possibly use this issue to execute arbitrary code.
(CVE-2018-0502, CVE-2018-13259)

Richard Maciel Costa discovered that Zsh incorrectly handled certain scripts. An attacker could possibly use this issue to execute arbitrary code. (CVE-2018-1100).

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.

ID	Name	Product	Family	Severity
159025	SUSE SLES11 Security Update : zsh (SUSE-SU-2022:14910-1)	Nessus	SuSE Local Security Checks	critical
157128	SUSE SLES12 Security Update : zsh (SUSE-SU-2022:0161-1)	Nessus	SuSE Local Security Checks	critical
143401	Debian DLA-2470-1 : zsh security update	Nessus	Debian Local Security Checks	critical
132219	EulerOS 2.0 SP3 : zsh (EulerOS-SA-2019-2684)	Nessus	Huawei Local Security Checks	critical
131613	EulerOS 2.0 SP2 : zsh (EulerOS-SA-2019-2459)	Nessus	Huawei Local Security Checks	critical
130697	EulerOS 2.0 SP5 : zsh (EulerOS-SA-2019-2235)	Nessus	Huawei Local Security Checks	critical
126110	Photon OS 2.0: Zsh PHSA-2019-2.0-0165	Nessus	PhotonOS Local Security Checks	critical
123297	openSUSE Security Update : zsh (openSUSE-2019-687)	Nessus	SuSE Local Security Checks	critical
122730	GLSA-201903-02 : Zsh: User-assisted execution of arbitrary code	Nessus	Gentoo Local Security Checks	critical
120450	Fedora 29 : zsh (2018-5ad8e216d2)	Nessus	Fedora Local Security Checks	critical
120251	Fedora 28 : zsh (2018-16bb8b00c5)	Nessus	Fedora Local Security Checks	critical
120096	SUSE SLED15 / SLES15 Security Update : zsh (SUSE-SU-2018:2686-1)	Nessus	SuSE Local Security Checks	critical
118044	Amazon Linux 2 : zsh (ALAS-2018-1089)	Nessus	Amazon Linux Local Security Checks	critical
117898	openSUSE Security Update : zsh (openSUSE-2018-1094)	Nessus	SuSE Local Security Checks	critical
117525	openSUSE Security Update : zsh (openSUSE-2018-1018)	Nessus	SuSE Local Security Checks	critical
117508	Fedora 27 : zsh (2018-8b1b2373b4)	Nessus	Fedora Local Security Checks	critical
117456	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : Zsh vulnerabilities (USN-3764-1)	Nessus	Ubuntu Local Security Checks	critical

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CVE-2018-0502

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