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TITLE:
ImperialBB Avatar File Upload Vulnerability

SECUNIA ADVISORY ID:
SA30939

VERIFY ADVISORY:
http://secunia.com/advisories/30939/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
ImperialBB 2.x
http://secunia.com/product/19249/

DESCRIPTION:
PHPLizardo has discovered a vulnerability in ImperialBB, which can be
exploited by malicious users to compromise a vulnerable system.

The vulnerability is caused due to missing restrictions on file types
that users are allowed to upload as avatar images. This can be
exploited to upload malicious script files (e.g. PHP scripts) inside
the web root.

The vulnerability is confirmed in version 2.3.5. Other versions may
also be affected.

SOLUTION:
Edit the source code to ensure that the name and type of files are
properly sanitised and verified.

PROVIDED AND/OR DISCOVERED BY:
PHPLizardo

ORIGINAL ADVISORY:
http://phplizardo.breizh-web.net/blog/2008/07/05/advisory-1-imperialbb/

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
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Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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