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Category:   Application (Forum/Board/Portal)  >   Topic Calendar (for phpBB) Vendors:   Ptirhiik
Topic Calendar Mod for phpBB Permits Cross-Site Scripting Attacks and Discloses Path to Remote Users
SecurityTracker Alert ID:  1013554
SecurityTracker URL:  http://securitytracker.com/id/1013554
CVE Reference:   CVE-2005-0871, CVE-2005-0872   (Links to External Site)
Updated:  Jul 7 2008
Original Entry Date:  Mar 24 2005
Impact:   Disclosure of authentication information, Disclosure of system information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Exploit Included:  Yes  
Version(s): 1.0.1
Description:   Several vulnerabilities were reported in Topic Calendar for phpBB. A remote user can conduct cross-site scripting attacks. A remote user can determine the installation path.

The 'calendar_scheduler.php' script does not properly validate user-supplied input in the 'start' parameter. A remote user can create a specially crafted URL that, when loaded by a target user, will cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the Topic Calendar software and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

A demonstration exploit URL is provided:

http://[target]/phpbb/calendar_scheduler.php?start=%22%3E%3Cscript%3Ealert(document.cookie)%3C/script%3E

A remote user can supply the following type of URL to cause the server to disclose the installation path:

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

This exploit works when the target system is running Microsoft IIS web server.

Alberto Trivero from CODEBUG Labs reported this vulnerability.

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the Topic Calendar software, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

A remote user can determine the installation path.

Solution:   No solution was available at the time of this entry.
Cause:   Access control error, Input validation error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.


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