AusCERT - AA-2009.0157 -- [Win][UNIX/Linux] -- Tor: Denial of Service

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AA-2009.0157 -- [Win][UNIX/Linux] -- Tor: Denial of Service
Date: 13 July 2009

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AA-2009.0157                  AUSCERT Advisory

                             [Win][UNIX/Linux]
                          Tor: Denial of Service
                               13 July 2009
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        AusCERT Advisory Summary
        ------------------------

Product:              Tor
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact:               Denial of Service
                      Provide Misleading Information
Access:               Remote/Unauthenticated
CVE Names:            CVE-2009-2425
Member content until: Tuesday, July 28 2009

Revision History:  July 13 2009: Added CVE Reference
                      June 30 2009: Initial Release

OVERVIEW:

       Tor 0.2.0.35 has been released fixing two security issues and a 
       number of bugs. 


IMPACT:

       The vendor provides the following details:
   
       "- Avoid crashing in the presence of certain malformed descriptors.
          Found by lark, and by automated fuzzing.
        - Fix an edge case where a malicious exit relay could convince a
          controller that the client's DNS question resolves to an internal 
          IP address. Bug found and fixed by "optimist"; bugfix 
          on 0.1.2.8-beta." [1]


MITIGATION:

       The vendor recommends updating to version 0.2.0.35, available for
       download from their website. [2]


REFERENCES:

       [1] Tor 0.2.0.35 is released
           http://archives.seul.org/or/announce/Jun-2009/msg00000.html
 
       [2] Tor Download
           https://www.torproject.org/easy-download.html

AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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