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AA-2009.0076                  AUSCERT Advisory

                          [Win][Linux][Mac][OSX]
               MapServer - multiple vulnerabilities patched
                               1 April 2009
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        AusCERT Advisory Summary
        ------------------------

Product:              MapServer
Operating System:     Linux variants
                      Mac OS X
                      Windows
Impact:               Execute Arbitrary Code/Commands
                      Create Arbitrary Files
                      Access Confidential Data
Access:               Remote/Unauthenticated
CVE Names:            CVE-2009-0843 CVE-2009-0842 CVE-2009-0841
                      CVE-2009-0840 CVE-2009-0839
Member content until: Wednesday, April 29 2009

OVERVIEW:

      MapServer 5.2.2 and 4.10.4 have been released, correcting multiple
      security vulnerabilities.


IMPACT:

      (CVE-2009-0839)
      A stack-based buffer overflow issue in the mapserv CGI program exists,
      allowing a local attacker to execute arbitrary code. [1]

      (CVE-2009-0840)
      An out-of-bounds memory write can be caused by a remote attacker via a
      heap-based buffer underflow by sending a malformed POST request to the 
      mapserve CGI program. [1]

      (CVE-2009-0841)
      Insufficient validation of the CGI parameter allows for the creation
      of abritrary files. [1]

      (CVE-2009-0842)
      If an attacker creates a symlink to a file anywhere in the file system,
      the mapserv CGI program is vulnerable to data leakage. [1]

      (CVE-2009-0843)
      Any value passed to msLoadQuery() is not correctly validated and the 
      mapserv CGI program will attempt to open a file by that name and, if 
      absent, report its absence.  [1]

      
MITIGATION:

      It is recommended that users upgrade to the latest versions. [2]


REFERENCES:

      [1] MapServer 5.2.2 and 4.10.4 released with security fixes
          http://lists.osgeo.org/pipermail/mapserver-users/2009-March/060600.html

      [2] Download
          http://mapserver.org/download.html#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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