CVE-2018-15856

Publication date 25 August 2018

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

An infinite loop when reaching EOL unexpectedly in compose/parser.c (aka the keymap parser) in xkbcommon before 0.8.1 could be used by local attackers to cause a denial of service during parsing of crafted keymap files.

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	Fixed 0.4.1-0ubuntu1.1

Notes

leosilva

Trusty need to be researched since code is quite different and /compose is not present.

Patch details

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

Package	Patch details
libxkbcommon	Vendor: 842e435

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