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FreeBSD : zsh -- Arbitrary command execution vulnerability (d923fb0c-8c2f-11ec-aa85-0800270512f4)

high Nessus Plugin ID 157935

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Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the d923fb0c-8c2f-11ec-aa85-0800270512f4 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

Update the affected packages.

See Also

https://zsh.sourceforge.io/releases.html

http://www.nessus.org/u?d0ddacce

Plugin Details

Severity: High

ID: 157935

File Name: freebsd_pkg_d923fb0c8c2f11ecaa850800270512f4.nasl

Version: 1.5

Type: local

Published: 2/12/2022

Updated: 11/6/2023

Supported Sensors: 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:freebsd:freebsd:zsh, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Ease: No known exploits are available

Patch Publication Date: 2/12/2022

Vulnerability Publication Date: 2/12/2022

Reference Information

CVE: CVE-2021-45444