The JK Connector (aka mod_jk) 1.2.0 through 1.2.26 in Apache Tomcat allows remote attackers to obtain sensitive information via an arbitrary request from an HTTP client, in opportunistic circumstances involving (1) a request from a different client that included a Content-Length header but no POST data or (2) a rapid series of requests, related to noncompliance with the AJP protocol's requirements for requests containing Content-Length headers.
https://bugzilla.redhat.com/show_bug.cgi?id=490201
http://www.vupen.com/english/advisories/2009/0973
http://www.securityfocus.com/bid/34412
http://www.securityfocus.com/archive/1/502530/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2009-0446.html
http://www.openwall.com/lists/oss-security/2009/04/08/10
http://www.debian.org/security/2009/dsa-1810
http://tomcat.apache.org/security-jk.html
http://tomcat.apache.org/connectors-doc/miscellaneous/changelog.html
http://svn.eu.apache.org/viewvc?view=rev&revision=702540
http://sunsolve.sun.com/search/document.do?assetkey=1-26-262468-1
http://securitytracker.com/id?1022001
http://secunia.com/advisories/35537
http://secunia.com/advisories/34621
http://secunia.com/advisories/29283
http://marc.info/?l=tomcat-dev&m=123913700700879
http://lists.opensuse.org/opensuse-security-announce/2009-11/msg00004.html