message/ax/AxMessage.java in OpenID4Java before 0.9.6 final, as used in JBoss Enterprise Application Platform 5.1 before 5.1.2, Step2, Kay Framework before 1.0.2, and possibly other products does not verify that Attribute Exchange (AX) information is signed, which allows remote attackers to modify potentially sensitive AX information without detection via a man-in-the-middle (MITM) attack.
https://issues.jboss.org/browse/SOA-3597
https://issues.jboss.org/browse/JBEPP-1368
http://www.redhat.com/support/errata/RHSA-2011-1804.html
http://www.openwall.com/lists/oss-security/2011/11/17/1
http://www.openwall.com/lists/oss-security/2011/11/16/1
http://securitytracker.com/id?1026400
http://secunia.com/advisories/48954
http://secunia.com/advisories/48697
http://secunia.com/advisories/44496
http://rhn.redhat.com/errata/RHSA-2012-0519.html
http://rhn.redhat.com/errata/RHSA-2012-0441.html
http://openid.net/2011/05/05/attribute-exchange-security-alert/