CVE-2018-1100

Publication date 11 April 2018

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

zsh through version 5.4.2 is vulnerable to a stack-based buffer overflow in the utils.c:checkmailpath function. A local attacker could exploit this to execute arbitrary code in the context of another user.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
zsh	18.04 LTS bionic	Fixed 5.4.2-3ubuntu3.1
	17.10 artful	Ignored end of life
	16.04 LTS xenial	Fixed 5.1.1-1ubuntu2.3
	14.04 LTS trusty	Fixed 5.0.2-3ubuntu6.3

Patch details

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

Package	Patch details
zsh	Upstream: https://sourceforge.net/p/zsh/code/ci/31f72205630687c1cef89347863aab355296a27f/

Severity score breakdown

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

References

Related Ubuntu Security Notices (USN)

USN-3764-1
Zsh vulnerabilities
11 September 2018