CVE-2013-4143: David Bagley Xlockmore

Low severity, CVSS 2.1. EPSS: 0.4% chance of exploitation in the next 30 days.

The (1) checkPasswd and (2) checkGroupXlockPasswds functions in xlockmore before 5.43 do not properly handle when a NULL value is returned upon an error by the crypt or dispcrypt function as implemented in glibc 2.17 and later, which allows attackers to bypass the screen lock via vectors related to invalid salts.

Affected products

• David Bagley Xlockmore: up to and including 5.42; version 5.24 only; version 5.25 only; version 5.26 only; version 5.27 only; version 5.28 only; …

Published 2014-05-30. Last modified 2026-06-16.