A vulnerability has been discovered in GuestCal, which can be exploited by malicious people to disclose potentially sensitive information.
Input passed to the "lang" parameter in index.php is not properly verified before being used to include files. This can be exploited to include arbitrary files from local resources via directory traversal attacks.
The vulnerability is confirmed in version 2.1. Other versions may also be affected.
Solution: Edit the source code to ensure that input is properly verified.
Provided and/or discovered by: SirGod
Original Advisory: http://milw0rm.com/exploits/8431
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Subject: GuestCal "lang" Local File Inclusion Vulnerability
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