{"id":"UBUNTU-CVE-2014-0979","details":"The start_authentication function in lightdm-gtk-greeter.c in LightDM GTK+ Greeter before 1.7.1 does not properly handle the return value from the lightdm_greeter_get_authentication_user function, which allows local users to cause a denial of service (NULL pointer dereference) via an empty username.","modified":"2025-07-16T08:10:55.212058Z","published":"2014-01-23T01:55:00Z","withdrawn":"2025-07-18T16:42:59Z","upstream":["CVE-2014-0979"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2014-0979"},{"type":"REPORT","url":"https://bugs.launchpad.net/lightdm-gtk-greeter/+bug/1266449"},{"type":"REPORT","url":"https://bugzilla.novell.com/show_bug.cgi?id=857303"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2014-0979"}],"affected":[{"package":{"name":"lightdm-gtk-greeter","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/lightdm-gtk-greeter@1.8.4-0ubuntu1?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.8.4-0ubuntu1"}]}],"versions":["1.6.1-0ubuntu1","1.6.1-0ubuntu2","1.6.1-0ubuntu3","1.8.1-1ubuntu1","1.8.1-1ubuntu2","1.8.2-1ubuntu1","1.8.3-0ubuntu1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"lightdm-gtk-greeter","binary_version":"1.8.4-0ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2014/UBUNTU-CVE-2014-0979.json"}}],"schema_version":"1.7.3","severity":[{"type":"Ubuntu","score":"medium"}]}