The ippReadIO function in cups/ipp.c in cupsd in CUPS before 1.3.10 does not properly initialize memory for IPP request packets, which allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a scheduler request with two consecutive IPP_TAG_UNSUPPORTED tags.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9631
https://euvd.enisa.europa.eu/vulnerability/EUVD-2009-0946
https://bugzilla.redhat.com/show_bug.cgi?id=500972
http://www.securityfocus.com/bid/35169
http://www.securityfocus.com/archive/1/504032/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2009-1083.html
http://www.redhat.com/support/errata/RHSA-2009-1082.html
http://www.debian.org/security/2009/dsa-1811
http://www.coresecurity.com/content/AppleCUPS-null-pointer-vulnerability
http://securitytracker.com/id?1022321
http://secunia.com/advisories/36701
http://secunia.com/advisories/35685
http://secunia.com/advisories/35342
http://secunia.com/advisories/35340
http://secunia.com/advisories/35328
http://secunia.com/advisories/35322
http://lists.opensuse.org/opensuse-security-announce/2009-07/msg00002.html
http://lists.apple.com/archives/security-announce/2009/Sep/msg00004.html