The ap_proxy_ajp_request function in mod_proxy_ajp.c in mod_proxy_ajp in the Apache HTTP Server 2.2.x before 2.2.15 does not properly handle certain situations in which a client sends no request body, which allows remote attackers to cause a denial of service (backend server outage) via a crafted request, related to use of a 500 error code instead of the appropriate 400 error code.
httpd.apache.org/security/vulnerabilities_22.html
lists.apple.com/archives/security-announce/2010//Nov/msg00000.html
lists.fedoraproject.org/pipermail/package-announce/2010-April/039957.html
lists.fedoraproject.org/pipermail/package-announce/2010-May/040652.html
lists.opensuse.org/opensuse-security-announce/2010-04/msg00006.html
marc.info/?l=bugtraq&m=127557640302499&w=2
secunia.com/advisories/39100
secunia.com/advisories/39501
secunia.com/advisories/39628
secunia.com/advisories/39632
secunia.com/advisories/39656
secunia.com/advisories/40096
support.apple.com/kb/HT4435
svn.apache.org/viewvc/httpd/httpd/branches/2.2.x/modules/proxy/mod_proxy_ajp.c?r1=917876&r2=917875&pathrev=917876
svn.apache.org/viewvc?view=revision&revision=917876
www-01.ibm.com/support/docview.wss?uid=swg1PM08939
www-01.ibm.com/support/docview.wss?uid=swg1PM12247
www-01.ibm.com/support/docview.wss?uid=swg1PM15829
www.debian.org/security/2010/dsa-2035
www.mandriva.com/security/advisories?name=MDVSA-2010:053
www.mandriva.com/security/advisories?name=MDVSA-2013:150
www.oracle.com/technetwork/topics/security/cpuapr2013-1899555.html
www.redhat.com/support/errata/RHSA-2010-0168.html
www.securityfocus.com/bid/38491
www.vupen.com/english/advisories/2010/0911
www.vupen.com/english/advisories/2010/0994
www.vupen.com/english/advisories/2010/1001
www.vupen.com/english/advisories/2010/1057
www.vupen.com/english/advisories/2010/1411
bugzilla.redhat.com/show_bug.cgi?id=569905
lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3E
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lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org%3E
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lists.apache.org/thread.html/reb7c64aeea604bf948467d9d1cab8ff23fa7d002be1964bcc275aae7%40%3Ccvs.httpd.apache.org%3E
lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3E
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8619
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9935