A denial of service flaw was found in the way xlockmore, X screen lock and screen saver, performed passing arguments to underlying localtime() call, when the 'dlock' mode was used. An attacker could use this flaw to potentially obtain unauthorized access to screen / graphical session, previously locked by another user / victim.
CVE request (containing also patch proposal):
Created attachment 629482 [details]
Local copy of the proposed preliminary patch from 
This issue affects the versions of the xlockmore package, as shipped with Fedora release of 16 and 17. Please schedule an update.
This issue affects the version of the xlockmore package, as shipped with Fedora EPEL 6. Please schedule an update.
Created xlockmore tracking bugs for this issue
Affects: fedora-all [bug 867910]
Affects: epel-6 [bug 867911]
xlockmore-5.40-4.el6 has been pushed to the Fedora EPEL 6 stable repository. If problems still persist, please make note of it in this bug report.