CVE-2021-45444

moderate-risk

Published 2022-02-14

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.

Do I need to act?

0.11% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 7.8/10 High

LOCAL / LOW complexity

Affected Products (20)

Zsh

Fedora

Debian Linux

Mac Os X

Affected Vendors

Debian Apple Fedoraproject Zsh

References (24)

Mailing List http://seclists.org/fulldisclosure/2022/May/33

Mailing List http://seclists.org/fulldisclosure/2022/May/35

Mailing List http://seclists.org/fulldisclosure/2022/May/38

Mailing List https://lists.debian.org/debian-lts-announce/2022/02/msg00020.html

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...

Third Party Advisory https://support.apple.com/kb/HT213255

Third Party Advisory https://support.apple.com/kb/HT213256

Third Party Advisory https://support.apple.com/kb/HT213257

Third Party Advisory https://vuln.ryotak.me/advisories/63

Third Party Advisory https://www.debian.org/security/2022/dsa-5078

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

Mailing List http://seclists.org/fulldisclosure/2022/May/33

Mailing List http://seclists.org/fulldisclosure/2022/May/35

Mailing List http://seclists.org/fulldisclosure/2022/May/38

Mailing List https://lists.debian.org/debian-lts-announce/2022/02/msg00020.html

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...

Third Party Advisory https://support.apple.com/kb/HT213255

Third Party Advisory https://support.apple.com/kb/HT213256

and 4 more references

/ 100

moderate-risk

Severity 24/34 · High

Exploitability 0/34 · Minimal

Exposure 20/34 · Moderate