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AA-2009.0102                  AUSCERT Advisory

                                  [Cisco]
                    Cisco ASA: Multiple Vulnerabilities
                               27 April 2009
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        AusCERT Advisory Summary
        ------------------------

Product:              Cisco ASA 7.2.1
                      Cisco ASA 7.2.2
                      Cisco ASA 7.2.34
                      Cisco ASA 7.3
                      Cisco ASA 7.3.1
                      Cisco ASA 7.4
                      Cisco ASA 7.4.27
                      Cisco ASA 8.0.1.2
                      Cisco ASA 8.0.2
                      Cisco ASA 8.0.2.11
                      Cisco ASA 8.0.3
                      Cisco ASA 8.0.4
                      Cisco ASA 8.0.4.25
                      Cisco ASA 8.0.4.28
Operating System:     Cisco
Impact:               Execute Arbitrary Code/Commands
                      Cross-site Scripting
Access:               Remote/Unauthenticated
Member content until: Monday, May 25 2009

Comment: Proof of concept code is available for this vulnerability.

OVERVIEW:

       A vulnerability has been identified in Cisco Adaptive Security 
       Appliance (ASA) clientless SSL VPN feature.


IMPACT:

       The vendor describes the vulnerability as being due to "... 
       insufficient input validation within the WebVPN clientless mode
       feature." This vulnerability could be exploited by attackers to
       allow cross-site scripting attacks, and potentially the execution
       of arbitrary code. [1]   
       

MITIGATION:

       While the vulnerability has been confirmed by the vendor, no updates
       are yet available. The vendor recommends restricting access to affected
       systems to trusted users only, and advises that users should not follow
       unsolicited links, and always ensure that they have verified the 
       authenticity of links prior to following them. [1]


REFERENCES:

      [1] Cisco ASA Software WebVPN Cross-Site Scripting Vulnerability
          http://tools.cisco.com/security/center/viewAlert.x?alertId=17950

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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