Buffer overflow in xlockmore xlock program version 4.16 and earlier allows local users to read sensitive data from memory via a long -mode option.
http://www.securityfocus.com/bid/1267
http://www.nai.com/nai_labs/asp_set/advisory/41initialized.asp
http://archives.neohapsis.com/archives/bugtraq/2000-05/0375.html