Description
Apache Tomcat 7.0.x before 7.0.17 permits web applications to replace an XML parser used for other web applications, which allows local users to read or modify the (1) web.xml, (2) context.xml, or (3) tld files of arbitrary web applications via a crafted application that is loaded earlier than the target application. NOTE: this vulnerability exists because of a CVE-2009-0783 regression.
Remediation
References
http://marc.info/?l=bugtraq&m=139344343412337&w=2
http://secunia.com/advisories/57126
http://securitytracker.com/id?1025924
http://svn.apache.org/viewvc?view=revision&revision=1137753
http://svn.apache.org/viewvc?view=revision&revision=1138788
http://tomcat.apache.org/security-7.html
http://www.securityfocus.com/bid/49147
https://issues.apache.org/bugzilla/show_bug.cgi?id=51395