Rapid7 Security Advisory R7-0028: Caucho Resin World Readable DOS Device

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                        Rapid7 Security Advisory
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Rapid7 Advisory R7-0028
Caucho Resin World Readable DOS Device

   Published:  May 14, 2007
   Revision:   1.0
   http://www.rapid7.com/advisories/R7-0028

1. Affected system(s):

   KNOWN VULNERABLE:
    o Caucho Resin Professional v3.1.0 for Windows
    o Caucho Resin v3.1.0 for Windows
    o Caucho Resin v3.0.21 for Windows
    o Caucho Resin v3.0.20 for Windows
    o Caucho Resin v3.0.19 for Windows
    o Caucho Resin v3.0.18 for Windows
    o Caucho Resin v3.0.17 for Windows

   KNOWN FIXED:
    o Caucho Resin v3.1.1 for Windows
    o Caucho Resin Professional v3.1.1 for Windows

2. Summary

   The Caucho Resin web application server does not properly
   sanitize get requests on windows servers.  By specifying
   a DOS device file name appended with an arbitrary extension,
   an attacker could read a continuous stream of data from
   any COM or LPT device on the system.

   Rapid7 have updated NeXpose to check for this vulnerability. Licensed
   customers will receive the new vulnerability checks automatically.
   Visit www.rapid7.com to register for a
   free demo of NeXpose.

3. Vendor status and information

   Caucho Technology, Inc.
   http://www.caucho.com/

   Caucho was notified of this vulnerability on May 3rd, 2007.
   They fixed this vulnerability in the latest unofficial snapshot
   of Resin 3.1.1, available from Caucho's website.

4. Solution

   Upgrade to Caucho Resin 3.1.1 or later.

5. Detailed analysis

   Caucho Resin is a servlet and JSP server. Resin ships with its own
   stand-alone web server which runs by default on port 8080. Any remote
   user can request URLs of the form:

      http://victim:8080/[path]/[device].foo

   (where "[device]" can be COM1, COM2, LPT1, etc.) to open an input
   stream to any hardware serial or LPT device on the system.

   Once the initial connection is made, Resin will hold a lock on the
   device and subsequent requests to the same device may result
   in a 404/Not Found response from the server.

6. Credit

   Discovered by Derek Abdine of Rapid7.

7. Contact Information

   Rapid7, LLC
   Email: advisory@rapid7.com
   Web: http://www.rapid7.com
   Phone: +1 (617) 247-1717

8. Disclaimer and Copyright

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   provided in our security advisories. These advisories are a service
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   regard to this information. Any application or distribution of this
   information constitutes acceptance AS IS, at the user's own risk.
   This information is subject to change without notice.

   This advisory Copyright (C) 2007 Rapid7, LLC. Permission is hereby
   granted to redistribute this advisory, providing that no changes are
   made and that the copyright notices and disclaimers remain intact.