CVE-2014-0979 Information

Description

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.

Reference

http://lists.fedoraproject.org/pipermail/package-announce/2014-February/128117.html http://lists.fedoraproject.org/pipermail/package-announce/2014-February/128150.html http://lists.opensuse.org/opensuse-updates/2014-01/msg00048.html http://secunia.com/advisories/56211 http://secunia.com/advisories/56423 http://www.openwall.com/lists/oss-security/2014/01/07/15 http://www.securityfocus.com/bid/64679 https://bugs.launchpad.net/lightdm-gtk-greeter/+bug/1266449 https://bugzilla.novell.com/show_bug.cgi?id=857303