Debian DLA-2926-1 : zsh - LTS security update

high Nessus Plugin ID 158170

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Synopsis

The remote Debian host is missing a security-related update.

Description

The remote Debian 9 host has packages installed that are affected by a vulnerability as referenced in the dla-2926 advisory.

- In zsh before 5.8.1, an attacker can achieve code execution if they control a command output inside the prompt, as demonstrated by a %F argument. This occurs because of recursive PROMPT_SUBST expansion.
(CVE-2021-45444)

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

Solution

Upgrade the zsh packages.

For Debian 9 stretch, this problem has been fixed in version 5.3.1-4+deb9u5.

Plugin Details

Severity: High

ID: 158170

File Name: debian_DLA-2926.nasl

Version: 1.4

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 2/18/2022

Updated: 2/24/2022

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 5.1

Temporal Score: 3.8

Vector: CVSS2#AV:N/AC:H/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2021-45444

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:zsh-static, p-cpe:/a:debian:debian_linux:zsh, p-cpe:/a:debian:debian_linux:zsh-doc, cpe:/o:debian:debian_linux:9.0, p-cpe:/a:debian:debian_linux:zsh-dev, p-cpe:/a:debian:debian_linux:zsh-common

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 2/18/2022

Vulnerability Publication Date: 2/12/2022

Reference Information

CVE: CVE-2021-45444

Detections

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