Bugzilla 2.18.x before 2.18.6, 2.20.x before 2.20.3, 2.22.x before 2.22.1, and 2.23.x before 2.23.3 allow remote attackers to obtain (1) the description of arbitrary attachments by viewing the attachment in "diff" mode in attachment.cgi, and (2) the deadline field by viewing the XML format of the bug in show_bug.cgi.
https://bugzilla.mozilla.org/show_bug.cgi?id=346564
https://bugzilla.mozilla.org/show_bug.cgi?id=346086
http://www.vupen.com/english/advisories/2006/4035
http://www.securityfocus.com/bid/20538
http://www.securityfocus.com/archive/1/448777/100/100/threaded
http://www.bugzilla.org/security/2.18.5/
http://securitytracker.com/id?1017064
http://securityreason.com/securityalert/1760
http://security.gentoo.org/glsa/glsa-200611-04.xml