TITLE:
phpBB "Upload Avatar from a URL" Remote HTTP Request Weakness

SECUNIA ADVISORY ID:
SA20093

VERIFY ADVISORY:
http://secunia.com/advisories/20093/

CRITICAL:
Not critical

IMPACT:
Security Bypass

WHERE:
>From remote

SOFTWARE:
phpBB 2.x
http://secunia.com/product/463/

DESCRIPTION:
rgod has discovered a weakness in phpBB, which can be exploited by
malicious people to use it for making HTTP requests to other sites.

The weakness is caused due to a design error in the "Upload Avatar
from a URL" functionality. This can be exploited to cause the server
to make HTTP GET requests to arbitrary remote sites.

Successful exploitation requires that the "Enable avatar uploading"
setting is enabled (disabled by default).

The weakness has been confirmed in version 2.0.20. Other versions may
also be affected.

SOLUTION:
Disable "Enable avatar uploading" if enabled.

PROVIDED AND/OR DISCOVERED BY:
rgod

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