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.

- add lightdm-gtk-greeter-handle-invalid-user.patch in     order to fix a NULL pointer dereference after     authentication of an invalid username has failed     (bnc#857303, CVE-2014-0979)

  - add lightdm-gtk-greeter-invalid-last_session.patch fix     segfault when last_session is an invalid session     (lp#1161883)

  - add lightdm-gtk-greeter-fix-login.patch in order to fix     login/unlock detection

Fix potential denial of service.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
75386	openSUSE Security Update : lightdm-gtk-greeter (openSUSE-SU-2014:0071-1)	Nessus	SuSE Local Security Checks	low
72444	Fedora 19 : lightdm-gtk-1.6.1-3.fc19 (2014-1648)	Nessus	Fedora Local Security Checks	low
72443	Fedora 20 : lightdm-gtk-1.6.1-3.fc20 (2014-1647)	Nessus	Fedora Local Security Checks	low

Detections

Analytics

CVE-2014-0979

medium

Tenable Plugins

low

low

low