Description
Apache Tomcat before 6.0.40, 7.x before 7.0.54, and 8.x before 8.0.6 does not properly constrain the class loader that accesses the XML parser used with an XSLT stylesheet, which allows remote attackers to (1) read arbitrary files via a crafted web application that provides an XML external entity declaration in conjunction with an entity reference, related to an XML External Entity (XXE) issue, or (2) read files associated with different web applications on a single Tomcat instance via a crafted web application.
Remediation
References
http://tomcat.apache.org/security-6.html
http://svn.apache.org/viewvc?view=revision&revision=1589992
http://svn.apache.org/viewvc?view=revision&revision=1590028
http://svn.apache.org/viewvc?view=revision&revision=1588199
http://svn.apache.org/viewvc?view=revision&revision=1593815
http://svn.apache.org/viewvc?view=revision&revision=1589997
http://svn.apache.org/viewvc?view=revision&revision=1589985
http://svn.apache.org/viewvc?view=revision&revision=1589990
http://svn.apache.org/viewvc?view=revision&revision=1588193
http://tomcat.apache.org/security-8.html
http://tomcat.apache.org/security-7.html
http://svn.apache.org/viewvc?view=revision&revision=1589640
http://svn.apache.org/viewvc?view=revision&revision=1589837
http://svn.apache.org/viewvc?view=revision&revision=1589980
http://svn.apache.org/viewvc?view=revision&revision=1590036
http://svn.apache.org/viewvc?view=revision&revision=1589983
http://svn.apache.org/viewvc?view=revision&revision=1593821
http://secunia.com/advisories/59873
http://www-01.ibm.com/support/docview.wss?uid=swg21678231
http://www.securityfocus.com/bid/67669
http://secunia.com/advisories/59732
http://www.oracle.com/technetwork/topics/security/cpujul2014-1972956.html
http://www-01.ibm.com/support/docview.wss?uid=swg21681528
http://secunia.com/advisories/60729
http://www.oracle.com/technetwork/topics/security/cpuoct2014-1972960.html
http://www.vmware.com/security/advisories/VMSA-2014-0012.html
http://seclists.org/fulldisclosure/2014/Dec/23
http://advisories.mageia.org/MGASA-2014-0268.html
http://www.mandriva.com/security/advisories?name=MDVSA-2015:052
http://rhn.redhat.com/errata/RHSA-2015-0675.html
http://www.mandriva.com/security/advisories?name=MDVSA-2015:053
http://rhn.redhat.com/errata/RHSA-2015-0720.html
http://www.mandriva.com/security/advisories?name=MDVSA-2015:084
http://rhn.redhat.com/errata/RHSA-2015-0765.html
http://www.debian.org/security/2016/dsa-3530
http://www.debian.org/security/2016/dsa-3552
http://marc.info/?l=bugtraq&m=141017844705317&w=2
http://marc.info/?l=bugtraq&m=144498216801440&w=2
http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04851013
http://www.securitytracker.com/id/1030298
http://seclists.org/fulldisclosure/2014/May/141
http://www.ubuntu.com/usn/USN-2654-1
http://www.securityfocus.com/archive/1/534161/100/0/threaded
https://lists.apache.org/thread.html/b8a1bf18155b552dcf9a928ba808cbadad84c236d85eab3033662cfb%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/39ae1f0bd5867c15755a6f959b271ade1aea04ccdc3b2e639dcd903b%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/37220405a377c0182d2afdbc36461c4783b2930fbeae3a17f1333113%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/b84ad1258a89de5c9c853c7f2d3ad77e5b8b2930be9e132d5cef6b95%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/r03c597a64de790ba42c167efacfa23300c3d6c9fe589ab87fe02859c%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/r9136ff5b13e4f1941360b5a309efee2c114a14855578c3a2cbe5d19c%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/r587e50b86c1a96ee301f751d50294072d142fd6dc08a8987ae9f3a9b%40%3Cdev.tomcat.apache.org%3E