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AA-2008.0092                  AUSCERT Advisory

                               [UNIX/Linux]
             ClamAV multiple denial of service vulnerabilities
                               18 April 2008
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        AusCERT Advisory Summary
        ------------------------

Product:              ClamAV prior to 0.93
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact:               Denial of Service
Access:               Remote/Unauthenticated
CVE Names:            CVE-2008-1837 CVE-2008-1836 CVE-2008-1835
Member content until: Friday, May 16 2008

Original Bulletin:    
  http://lurker.clamav.net/message/20080414.161123.ba784ba8.en.html

OVERVIEW:

        ClamAV versions prior to 0.93 contain multiple denial of service 
        vulnerabilities.


IMPACT: 

        According to the NIST National Vulnerability Database the following 
        issues were present in versions prior to ClamAV 0.93:

        "ClamAV before 0.93 allows remote attackers to bypass the scanning 
         engine via a RAR file with an invalid version number, which cannot 
         be parsed by ClamAV but can be extracted by Winrar." [1]
	
         "The rfc2231 function in message.c in libclamav in ClamAV before 
          0.93 allows remote attackers to cause a denial of service (crash) 
          via a crafted message that produces a string that is not null 
          terminated, which triggers a buffer over-read." [2]

        "libclamunrar in ClamAV before 0.93 allows remote attackers to 
         cause a denial of service (crash) via crafted RAR files" [3]
        

MITIGATION: 

        Users of ClamAV should upgrade to the version 0.93 [4].


REFERENCES:

        [1] CVE-2008-1835
            http://nvd.nist.gov/nvd.cfm?cvename=CVE-2008-1835

	[2] CVE-2008-1836
            http://nvd.nist.gov/nvd.cfm?cvename=CVE-2008-1836

	[3] CVE-2008-1837
            http://nvd.nist.gov/nvd.cfm?cvename=CVE-2008-1837 

        [4] ClamAV Download
            http://www.clamav.org/download


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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