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TITLE:
Apache Tomcat Denial of Service and Information Disclosure

SECUNIA ADVISORY ID:
SA35326

VERIFY ADVISORY:
http://secunia.com/advisories/35326/

DESCRIPTION:
Two vulnerabilities have been reported in Apache Tomcat, which can be
exploited by malicious people to cause a DoS (Denial of Service) or
potentially disclose sensitive information.  

1) An error exists when processing invalid HTTP headers received via
the Java AJP connector. This can be exploited to close AJP
connections and temporarily block a connector that is a member of a
mod_jk load balancing worker.

2) An error in certain authentication classes can be exploited to
potentially enumerate existing usernames via specially crafted
URL-encoded passwords and brute force attacks.

Successful exploitation of this vulnerability requires that form
based authentication ("j_security_check") with one of the
"MemoryRealm", "DataSourceRealm", or "JDBCRealm" authentication
realms is used.

The vulnerabilities are reported in versions 4.1.0 through 4.1.39 and
5.5.0 through 5.5.27.

SOLUTION:
Fixed in the SVN repository.

Apache Tomcat 4.1.x:
http://svn.apache.org/viewvc?rev=781362&view=rev
http://svn.apache.org/viewvc?rev=781382&view=rev

Apache Tomcat 5.5.x:
http://svn.apache.org/viewvc?rev=781362&view=rev
http://svn.apache.org/viewvc?rev=781379&view=rev

PROVIDED AND/OR DISCOVERED BY:
The vendor credits:
1) Yoshihito Fukuyama
2) D. Matscheko and T. Hackner of SEC Consult

ORIGINAL ADVISORY:
http://tomcat.apache.org/security-4.html
http://tomcat.apache.org/security-5.html

http://marc.info/?l=tomcat-user&m=124404378413716&w=2
http://marc.info/?l=tomcat-user&m=124404378913734&w=2

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