v1per-haCker has discovered a vulnerability in LetterIt, which can be exploited by malicious people to compromise a vulnerable system.
Input passed to the "lang" parameter in inc/session.php is not properly verified before being used to include files. This can be exploited to execute arbitrary PHP code by including files from local or external resources.
Successful exploitation requires that "register_globals" is enabled.
The vulnerability is confirmed in version "V2 060821". Prior versions may also be affected.
Solution: Update to version "V2 061110".
Provided and/or discovered by: v1per-haCker
Original Advisory: http://www.milw0rm.com/exploits/2744
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