CVE-2018-15858

Publication date 25 August 2018

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

Unchecked NULL pointer usage when handling invalid aliases in CopyKeyAliasesToKeymap in xkbcomp/keycodes.c in xkbcommon before 0.8.1 could be used by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap file.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libxkbcommon	18.10 cosmic	Not affected
	18.04 LTS bionic	Fixed 0.8.0-1ubuntu0.1
	16.04 LTS xenial	Fixed 0.5.0-1ubuntu2.1
	14.04 LTS trusty	Not in release

Notes

leosilva

code in trusty is quite different. portions of the code affected are not present so changing to not-affected.

Patch details

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

Package	Patch details
libxkbcommon	Vendor: badb428

Severity score breakdown

Parameter	Value
Base score	5.5 · Medium
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H