In subst.c in zsh through 5.4.2, there is a NULL pointer dereference when using ${(PA)...} on an empty array result.

An update of the zsh package has been released.

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

- avoid crash when copying empty hash table     (CVE-2018-7549)

  - avoid NULL dereference when using ```${(PA)...}``` on an     empty array (CVE-2018-7548)

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.

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.

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)

- 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.

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.

ID	Name	Product	Family	Severity
121928	Photon OS 2.0: Zsh PHSA-2018-2.0-0028	Nessus	PhotonOS Local Security Checks	critical
121145	Slackware 14.0 / 14.1 / 14.2 : zsh (SSA:2019-013-01)	Nessus	Slackware Local Security Checks	critical
120817	Fedora 28 : zsh (2018-d2dcdbb051)	Nessus	Fedora Local Security Checks	critical
110174	GLSA-201805-10 : Zsh: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
109139	Amazon Linux 2 : zsh (ALAS-2018-986)	Nessus	Amazon Linux Local Security Checks	critical
108506	Fedora 26 : zsh (2018-9cdf18a850)	Nessus	Fedora Local Security Checks	critical
108306	Fedora 27 : zsh (2018-019a32a468)	Nessus	Fedora Local Security Checks	critical
107257	Ubuntu 14.04 LTS / 16.04 LTS : Zsh vulnerabilities (USN-3593-1)	Nessus	Ubuntu Local Security Checks	critical

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CVE-2018-7548

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