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Ubuntu 21.10, 20.04 LTS: USN-5325-1 Critical Zsh Security Flaws

ubuntu
Calendar Grey March 14, 2022
Dist Ubuntu Esm H88
Keep updated with the latest Ubuntu Security Notice USN-5325-2 concerning Zsh flaws that impact multiple versions.
Several security issues were fixed in Zsh.

Summary

Several security issues were fixed in Zsh.

Software Description:

- zsh: shell with lots of features

Details:

Sam Foxman discovered that Zsh incorrectly handled certain inputs.

An attacker could possibly use this issue to regain dropped privileges.

(CVE-2019-20044)

It was discovered that Zsh incorrectly handled certain inputs.

An attacker could possibly use this issue to execute arbitrary code.

(CVE-2021-45444)

Topics%20covered

Topics Covered

security advisory critical code execution privilege escalation ubuntu zsh

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 21.10:
   zsh                             5.8-6ubuntu0.1
   zsh-static                      5.8-6ubuntu0.1

Ubuntu 20.04 LTS:
   zsh                             5.8-3ubuntu1.1
   zsh-static                      5.8-3ubuntu1.1

Ubuntu 18.04 LTS:
   zsh                             5.4.2-3ubuntu3.2
   zsh-static                      5.4.2-3ubuntu3.2

Ubuntu 16.04 ESM:
   zsh                             5.1.1-1ubuntu2.3+esm1
   zsh-static                      5.1.1-1ubuntu2.3+esm1

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-5325-1

CVE-2019-20044, CVE-2021-45444

Severity
critical
Lowest
Low
Medium
High
Critical

March 14, 2022

Topics%20covered

Topics Covered

security advisory critical code execution privilege escalation ubuntu zsh

Package Information

https://launchpad.net/ubuntu/+source/zsh/5.8-6ubuntu0.1
https://launchpad.net/ubuntu/+source/zsh/5.8-3ubuntu1.1
https://launchpad.net/ubuntu/+source/zsh/5.4.2-3ubuntu3.2

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