The cgi_initialize_string function in cgi-bin/var.c in the web interface in CUPS before 1.4.4, as used on Apple Mac OS X 10.5.8, Mac OS X 10.6 before 10.6.4, and other platforms, does not properly handle parameter values containing a % (percent) character without two subsequent hex characters, which allows context-dependent attackers to obtain sensitive information from cupsd process memory via a crafted request, as demonstrated by the (1) /admin?OP=redirect&URL=% and (2) /admin?URL=/admin/&OP=% URIs.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9723
http://www.vupen.com/english/advisories/2011/0535
http://www.vupen.com/english/advisories/2010/1481
http://www.securityfocus.com/bid/40871
http://www.mandriva.com/security/advisories?name=MDVSA-2010:234
http://www.mandriva.com/security/advisories?name=MDVSA-2010:232
http://www.debian.org/security/2011/dsa-2176
http://support.apple.com/kb/HT4188
http://security.gentoo.org/glsa/glsa-201207-10.xml
http://secunia.com/advisories/43521
http://secunia.com/advisories/40220
http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00000.html
http://lists.apple.com/archives/security-announce/2010//Jun/msg00001.html