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CVE-2021-45444

Publication date 14 February 2022

Last updated 24 July 2024

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

7.8 · High

Score breakdown

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.

Read the notes from the security team

Status

Package Ubuntu Release Status
zsh 24.04 LTS noble
Not affected
23.10 mantic
Not affected
23.04 lunar
Not affected
22.10 kinetic
Not affected
22.04 LTS jammy
Needs evaluation
21.10 impish
Fixed 5.8-6ubuntu0.1
20.04 LTS focal
Fixed 5.8-3ubuntu1.1
18.04 LTS bionic
Fixed 5.4.2-3ubuntu3.2
16.04 LTS xenial
14.04 LTS trusty Ignored

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Notes

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.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
zsh

Severity score breakdown

Parameter Value
Base score 7.8 · High
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H