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AusCERT Update AU-2006.0016 - [Win][UNIX/Linux]
Active exploiting of RealVNC 4.1.1 vulnerability
19 May 2006

        AusCERT Update Summary
        ----------------------

Product:              RealVNC 4.1.1
Operating System:     Windows
                      UNIX variants (UNIX, Linux, OSX)
Impact:               Inappropriate Access
Access:               Remote/Unauthenticated
Member content until: Monday, June 12 2006

Ref:                  AA-2006.0030

SANS ISC has seen received reports[1] of the RealVNC 4.1.1 vulnerability
reported in AusCERT Advisory AA-2006.0030[2] being actively exploited in
the wild.

AusCERT advises that users of RealVNC 4.1.1 take one or more of the
following actions as soon as possible:

    o Upgrade to RealVNC 4.1.2 [3]
    o Tunnel VNC sessions over SSH [4]
    o Limit network access to the VNC server. While this is a good general
      practice it should not relied upon to mitigate this vulnerability.

REFERENCES:

        [1] SANS ISC
            http://isc.sans.org/diary.php?storyid=1341&rss 

        [2] AusCERT Advisory AA-2006.0030
            https://www.auscert.org.au/6303

        [3] RealVNC
            http://www.realvnc.com

        [4] Using VNC with SSH
            http://www.cl.cam.ac.uk/Research/DTG/attarchive/vnc/sshvnc.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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