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TITLE:
PunBB Automatic Image Upload with Thumbnails Module File Upload

SECUNIA ADVISORY ID:
SA28138

VERIFY ADVISORY:
http://secunia.com/advisories/28138/

CRITICAL:
Moderately critical

IMPACT:
Cross Site Scripting, System access

WHERE:
>From remote

SOFTWARE:
Automatic Image Upload with Thumbnails (module for PunBB) 1.x
http://secunia.com/product/16985/

DESCRIPTION:
Peter Österberg has discovered a vulnerability in the Automatic Image
Upload with Thumbnails module for PunBB, which can be exploited by
malicious users to conduct cross-site scripting attacks and to
compromise a vulnerable system.

The uploadimg.php script fails to validate the extension of an
uploaded file. This can be exploited to upload files with ".html" or
".php" extensions by passing an allowed MIME media type in the HTTP
headers.

Successful exploitation allows to conduct cross-site scripting
attacks or to execute arbitrary PHP code on the server, but requires
valid user credentials in a group that is allowed to upload files.

The vulnerability is confirmed in version 1.3.3 and reported in
version 1.3.2. Other versions may also be affected.

SOLUTION:
Implement whitelisting based on file extensions in uploaded files.

Grant only trusted users privileges to upload files.

PROVIDED AND/OR DISCOVERED BY:
Peter Österberg, FortConsult A/S

ORIGINAL ADVISORY:
http://www.fortconsult.net/images/pdf/advisories/punBB_imgUpload.pdf

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