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DeluxeBB Multiple File Extensions File Upload Vulnerability
Secunia Advisory: SA20135
Release Date: 2006-05-17
Last Update: 2006-09-08
Popularity: 6,515 views

Critical:
Highly critical
Impact: System access
Where: From remote
Solution Status: Vendor Patch

Software:DeluxeBB 1.x

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CVE reference:CVE-2006-4558


Description:
rgod has discovered a vulnerability in DeluxeBB, which potentially can be exploited by malicious people to compromise a vulnerable system.

The vulnerability is caused due to an error in the handling of file uploads where a filename has multiple file extensions. This can be exploited to upload malicious script files inside the web root (e.g. a PHP script).

Successful exploitation may allow execution of script code depending on the HTTP server configuration (it requires e.g. an Apache server with the "mod_mime" module installed), but requires knowledge of the filename used to save the uploaded attachment.

The vulnerability has been confirmed in version 1.06. Other versions may also be affected.

Solution:
Update to version 1.07.
http://www.deluxebb.com/main.php?content=downloads

Provided and/or discovered by:
rgod

Changelog:
2006-06-26: Updated "Solution" section.
2006-09-08: Added CVE reference.

Original Advisory:
http://retrogod.altervista.org/deluxebb_106_xpl.html


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