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CVE-2008-3271: Tomcat information disclosure vulnerability

Severity: Low

Vendor:
The Apache Software Foundation

Versions Affected:
Tomcat 4.1.0 to 4.1.31
Tomcat 5.5.0
Tomcat 6.0.x is not affected
The unsupported Tomcat 3.x, 4.0.x and 5.0.x versions may be also affected

Description:
Bug 25835 (https://issues.apache.org/bugzilla/show_bug.cgi?id=25835) can,
in very rare circumstances, permit a user from a non-permitted IP address
to gain access to a context protected with a valve that extends
RemoteFilterValve.

Mitigation:
Upgrade to:
4.1.32 or later
5.5.1 or later
6.0.0 or later

Example:
This has only been reproduced using a debugger to force a particular
processing sequence across two threads.

    1. Set a breakpoint right after the place where a value
       is to be entered in the instance variable of regexp
       (search:org.apache.regexp.CharacterIterator).

    2. Send a request from the IP address* which is not permitted.
       (stopped at the breakpoint)

       *About the IP address which is not permitted.
       The character strings length of the IP address which is set
       in RemoteAddrValve must be same.

    3. Send a request from the IP address which was set in
       RemoteAddrValve.
       (stopped at the breakpoint)
       In this way, the instance variable is to be overwritten here.

    4. Resume the thread which is processing the step 2 above.

    5. The request from the not permitted IP address will succeed.

Credit:
This issue was discovered by Kenichi Tsukamoto (Development Dept. II,
Application Management Middleware Div., FUJITSU LIMITED) and reported to
the Tomcat security team via JPCERT.

References:
http://tomcat.apache.org/security.html

Mark Thomas
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