Debian DSA-5078-1 : zsh - security update

high Nessus Plugin ID 158109

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Synopsis

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

Description

The remote Debian 10 / 11 host has packages installed that are affected by a vulnerability as referenced in the dsa-5078 advisory.

It was discovered that zsh, a powerful shell and scripting language, did not prevent recursive prompt expansion. This would allow an attacker to execute arbitrary commands into a user's shell, for instance by tricking a vcs_info user into checking out a git branch with a specially crafted name. For the oldstable distribution (buster), this problem has been fixed in version 5.7.1-1+deb10u1. For the stable distribution (bullseye), this problem has been fixed in version 5.8-6+deb11u1. 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

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

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 the stable distribution (bullseye), this problem has been fixed in version 5.8-6+deb11u1.

Plugin Details

Severity: High

ID: 158109

File Name: debian_DSA-5078.nasl

Version: 1.5

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 2/16/2022

Updated: 1/24/2025

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, 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: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:zsh-static, cpe:/o:debian:debian_linux:10.0, p-cpe:/a:debian:debian_linux:zsh, p-cpe:/a:debian:debian_linux:zsh-doc, 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: 2/16/2022

Vulnerability Publication Date: 2/12/2022

Reference Information

CVE: CVE-2021-45444

Detections

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