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TITLE:
phpBB Topic calendar "start" Cross-Site Scripting Vulnerability

SECUNIA ADVISORY ID:
SA14659

VERIFY ADVISORY:
http://secunia.com/advisories/14659/

CRITICAL:
Less critical

IMPACT:
Cross Site Scripting, Exposure of system information

WHERE:
>From remote

SOFTWARE:
Topic calendar 1.x (module for phpBB)
http://secunia.com/product/4835/

DESCRIPTION:
Alberto Trivero has reported a vulnerability in the Topic calendar
module for phpBB, which can be exploited by malicious people to
conduct cross-site scripting attacks.

Input passed to the "start" parameter in "calendar_scheduler.php"
isn't properly sanitised before being returned to the user. This can
be exploited to execute arbitrary HTML and script code in a user's
browser session in context of an affected site.

It has also been reported that the full path to
"calender_scheduler.php" can be disclosed on Microsoft IIS.

Examples:
http://[host]/calendar_scheduler.php%5C
http://[host]/calendar_scheduler.php?d=-1

The vulnerability has been reported in version 1.0.1. Other versions
may also be affected.

SOLUTION:
Edit the source code to ensure that input is properly sanitised.

PROVIDED AND/OR DISCOVERED BY:
Alberto Trivero, CODEBUG Labs

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