Some vulnerabilities and a weakness have been reported in MapServer, which can be exploited by malicious people to disclose potentially sensitive information, bypass certain security restrictions, cause a DoS (Denial of Service), and potentially to compromise a vulnerable system.

1) A boundary error in the "mapserv" CGI program can be exploited to cause a stack-based buffer overflow e.g. via a specially crafted map file or potentially via specially crafted requests containing an overly long string (128 bytes) passed via the "id" parameter.

Successful exploitation may allow execution of arbitrary code.

2) An integer overflow error exists when processing the "Content-Length" header within the "mapserv" CGI program. This can be exploited to cause an out-of-bounds array access and corrupt memory via a specially crafted POST request.

Successful exploitation requires a web server that does not sanitise the "Content-Length" header.

3) Input passed to the "id" parameter to the "mapserv" CGI program is not properly sanitised before being used. This can be exploited to write files to arbitrary locations via directory traversal attacks.

4) An error in the "mapserv" CGI program in the processing of local .map files can be exploited to disclose potentially sensitive information in arbitrary .map files by specifying a full path via the "map" parameter.

5) An error in the "mapserv" CGI program in the processing of local .map files can be exploited to disclose the existence of local files via the "queryfile" parameter.

6) Boundary errors within the "msGenerateImages()" function in maptemplate.c can potentially be exploited to cause stack-based buffer overflows via a specially crafted map file.

The vulnerabilities and the weakness are reported in version prior to 5.2.2 and 4.10.4.

Solution
Update to version 5.2.3 or 4.10.5
Further details available to Secunia VIM customers

Provided and/or discovered by
1 - 5) Joe Testa, Positron Security

Additional information about the incorrect fix for vulnerability #2 provided by Nico Golde, Debian.

Changelog
Further details available to Secunia VIM customers

Original Advisory
MapServer:
http://lists.osgeo.org/pipermail/mapserver-users/2009-March/060600.html
http://trac.osgeo.org/mapserver/browser/tags/rel-5-2-3/mapserver/HISTORY.TXT
http://trac.osgeo.org/mapserver/browser/tags/rel-4-10-5/mapserver/HISTORY.TXT

Positron Security:
http://www.positronsecurity.com/advisories/2009-000.html

Debian:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=535340

Deep Links
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