high
7.8
Advisory Published
Updated

CVE-2021-45444

First published: Sun Feb 13 2022(Updated: )

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.

Credit: CVE-2021-45444 CVE-2021-45444 CVE-2021-45444 cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Zsh Zsh<5.8.1
Fedoraproject Fedora=34
Fedoraproject Fedora=35
Debian Debian Linux=9.0
Debian Debian Linux=10.0
Debian Debian Linux=11.0
Apple Mac OS X>=10.15<10.15.7
Apple Mac OS X=10.15.7-security_update_2020
Apple Mac OS X=10.15.7-security_update_2020-001
Apple Mac OS X=10.15.7-security_update_2020-005
Apple Mac OS X=10.15.7-security_update_2020-007
Apple Mac OS X=10.15.7-security_update_2021-001
Apple Mac OS X=10.15.7-security_update_2021-002
Apple Mac OS X=10.15.7-security_update_2021-003
Apple Mac OS X=10.15.7-security_update_2021-006
Apple Mac OS X=10.15.7-security_update_2021-007
Apple Mac OS X=10.15.7-security_update_2021-008
Apple Mac OS X=10.15.7-security_update_2022-001
Apple Mac OS X=10.15.7-security_update_2022-002
Apple Mac OS X=10.15.7-security_update_2022-003
Apple macOS>=11.0<11.6.6
Apple macOS>=12.0.0<12.4
Apple Catalina
Apple macOS Big Sur<11.6.6
11.6.6
<12.4
12.4
debian/zsh
5.7.1-1+deb10u1
5.8-6+deb11u1
5.9-4
5.9-5

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is CVE-2021-45444?

    CVE-2021-45444 is a vulnerability in zsh that was addressed by updating to zsh version 5.8.1.

  • Which software versions are affected by CVE-2021-45444?

    CVE-2021-45444 affects Apple macOS Catalina, macOS Big Sur (up to version 11.6.6), and macOS Monterey (up to version 12.4).

  • How do I fix CVE-2021-45444?

    To fix CVE-2021-45444, update to zsh version 5.8.1.

  • Where can I find more information about CVE-2021-45444?

    You can find more information about CVE-2021-45444 at the following references: [Link 1](https://support.apple.com/en-us/HT213257), [Link 2](https://support.apple.com/en-us/HT213255), [Link 3](https://support.apple.com/en-us/HT213256).

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