CVE-2021-45444

2022-02-1400:00:00

ubuntu.com

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

5.1 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

HIGH

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:H/Au:N/C:P/I:P/A:P

0.001 Low

EPSS

Percentile

37.6%

JSON

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.

Notes

Author	Note
rodrigo-zaiden	The commits fdb8b0ce and bdc4d70a are related to a partial commit that can be used in case an user can’t update to a patched version that contains c187154f commit.

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchzsh< 5.4.2-3ubuntu3.2UNKNOWN
ubuntu20.04noarchzsh< 5.8-3ubuntu1.1UNKNOWN
ubuntu21.10noarchzsh< 5.8-6ubuntu0.1UNKNOWN
ubuntu22.04noarchzsh< anyUNKNOWN
ubuntu16.04noarchzsh< 5.1.1-1ubuntu2.3+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	zsh	< 5.4.2-3ubuntu3.2	UNKNOWN
ubuntu	20.04	noarch	zsh	< 5.8-3ubuntu1.1	UNKNOWN
ubuntu	21.10	noarch	zsh	< 5.8-6ubuntu0.1	UNKNOWN
ubuntu	22.04	noarch	zsh	< any	UNKNOWN
ubuntu	16.04	noarch	zsh	< 5.1.1-1ubuntu2.3+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN