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Category:   Application (Calendar)  >   CalendarScript Vendors:   Kruse, Matt
CalendarScript Discloses Installation Path and Debug Information to Remote Users and Permits Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1013705
SecurityTracker URL:  http://securitytracker.com/id/1013705
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Apr 14 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): 3.20, 3.21
Description:   sNKenjoi reported several vulnerabilities in CalendarScript. A remote user can determine the installation path. A remote user can conduct cross-site scripting attacks. A remote user can also view debug information.

The 'calendar.pl' script does not properly validate user-supplied input. 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 CalendarScript 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]/cgi-bin/calendar/calendar.pl?calendar=[valid calender]&template=[XSS]

This type of URL will also cause the system to disclose the installation path.

A remote user can also supply an invalid calendar name to determine the installation path.

Version 3.20 is affected.

In version 3.21, a remote user can supply the following type of URL to cause the system to disclose the installation path as well as some debug information:

http://[target]/cgi-bin/calendar/calendar.pl?calendar=[valid calender]&year=f00b4r
http://[target]/cgi-bin/calendar/calendar.pl?calendar=[valid calender]&month=f00b4r

Also in version 3.21, the 'username' parameter is not filtered to remove HTML code. A demonstration exploit URL is provided:

http://[target]/cgi-bin/calendar/calendar.pl?calendar=[valid calender]&command=login&username=[XSS]&template=login.htm

The original advisory is available at:

http://www.snkenjoi.com/secadv/secadv3.txt

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the CalendarScript 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.

A remote user can view debug information.

Solution:   No solution was available at the time of this entry.
Vendor URL:  www.calendarscript.com/ (Links to External Site)
Cause:   Access control error, Input validation error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.


 Source Message Contents

Subject:  4 new security advisorys


http://www.snkenjoi.com/secadv/secadv1.txt
http://www.snkenjoi.com/secadv/secadv2.txt
http://www.snkenjoi.com/secadv/secadv3.txt
http://www.snkenjoi.com/secadv/secadv4.txt

-- 
snkenjoi.com
 
 


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