The libobby server in inc/server.hpp in libnet6 (aka net6) before 1.3.14 does not perform authentication before checking the user name, which allows remote attackers to obtain sensitive information such as server-usage patterns by a particular user and color preferences.
https://bugzilla.redhat.com/show_bug.cgi?id=750632
https://bugzilla.novell.com/show_bug.cgi?id=727708
http://www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html
http://www.openwall.com/lists/oss-security/2011/10/31/1
http://lists.opensuse.org/opensuse-updates/2012-01/msg00054.html
http://lists.opensuse.org/opensuse-updates/2012-01/msg00044.html