Apache Tomcat before 5.5.35, 6.x before 6.0.35, and 7.x before 7.0.23 computes hash values for form parameters without restricting the ability to trigger hash collisions predictably, which allows remote attackers to cause a denial of service (CPU consumption) by sending many crafted parameters.
mail-archives.apache.org/mod_mbox/tomcat-announce/201112.mbox/%3c4EFB9800.5010106%40apache.org%3e
marc.info/?l=bugtraq&m=132871655717248&w=2
marc.info/?l=bugtraq&m=133294394108746&w=2
marc.info/?l=bugtraq&m=136485229118404&w=2
rhn.redhat.com/errata/RHSA-2012-0074.html
rhn.redhat.com/errata/RHSA-2012-0075.html
rhn.redhat.com/errata/RHSA-2012-0076.html
rhn.redhat.com/errata/RHSA-2012-0077.html
rhn.redhat.com/errata/RHSA-2012-0078.html
rhn.redhat.com/errata/RHSA-2012-0089.html
rhn.redhat.com/errata/RHSA-2012-0325.html
rhn.redhat.com/errata/RHSA-2012-0406.html
secunia.com/advisories/48549
secunia.com/advisories/48790
secunia.com/advisories/48791
secunia.com/advisories/54971
secunia.com/advisories/55115
tomcat.apache.org/tomcat-7.0-doc/changelog.html
www.debian.org/security/2012/dsa-2401
www.kb.cert.org/vuls/id/903934
www.nruns.com/_downloads/advisory28122011.pdf
www.ocert.org/advisories/ocert-2011-003.html
www.securityfocus.com/bid/51200
bugzilla.redhat.com/show_bug.cgi?id=750521
github.com/FireFart/HashCollision-DOS-POC/blob/master/HashtablePOC.py
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18886