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.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Opensuse | Opensuse | 12.2 (including) | 12.2 (including) |
| Opensuse | Opensuse | 12.3 (including) | 12.3 (including) |
| Opensuse | Opensuse | 13.1 (including) | 13.1 (including) |
| Lightdm-gtk-greeter | Ubuntu | precise | * |
| Lightdm-gtk-greeter | Ubuntu | quantal | * |
| Lightdm-gtk-greeter | Ubuntu | raring | * |
| Lightdm-gtk-greeter | Ubuntu | saucy | * |
| Lightdm-gtk-greeter | Ubuntu | upstream | * |
References
- 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
- 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