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                         AUSCERT Security Bulletin

                               ASB-2012.0163
                A vulnerability has been identified in Tor
                             27 November 2012

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              Tor
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact/Access:        Denial of Service -- Remote/Unauthenticated
Resolution:           Patch/Upgrade
Member content until: Thursday, December 27 2012

OVERVIEW

        A vulnerability has been identified in Tor prior to version 0.2.3.25.


IMPACT

        The vendor has provided the following information regarding this
        vulnerability:
        
        "Fix a denial of service attack by which any directory authority
        could crash all the others, or by which a single v2 directory
        authority could crash everybody downloading v2 directory
        information." [1]


MITIGATION

        The vendor recommends upgrading to the latest version of Tor to
        correct this issue. [1]


REFERENCES

        [1] ReleaseNotes
            https://gitweb.torproject.org/tor.git/blob/release-0.2.3:/ReleaseNotes

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.

===========================================================================
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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