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Category:   Application (Calendar)  >   PerlCal Vendors:   Acme Software
PerCal Web Calendar Software Allows Remote Users to View Files on the Server
SecurityTracker Alert ID:  1001450
SecurityTracker URL:  http://securitytracker.com/id/1001450
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Updated:  Jun 10 2002
Original Entry Date:  Apr 28 2001
Impact:   Disclosure of system information, Disclosure of user information
Exploit Included:  Yes  
Version(s): probably 2.96 and prior
Description:   Whizkunde released a security advisory for PerlCal, a Perl-based web calendar, warning that it may allow remote users to view files on the server.

It is reported that the "cal_make.pl" script does not properly restrict use of ".." characters in the user-supplied URL.

As an example, a URL in the following format may allow the /etc/passwd file to be accessed by the remote user:

http://[targethost]/cgi-bin/cal_make.pl?p0=../../../../../../../../../../../../etc/passwd%00

The vendor has reportedly been notified.

Impact:   A remote user can obtain any file on the server that is readable by the web server.
Solution:   No solution was available at the time of this entry.
Vendor URL:  www.perlcal.com/ (Links to External Site)
Cause:   Access control error, Input validation error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
(Vendor Issued Fix) Re: PerCal Web Calendar Software Allows Remote Users to View Files on the Server
The vendor issued a fixed version.



 Source Message Contents

Subject:  PerlCal (CGI) show files vulnerability


[whizkunde security advisory: PerlCal (CGI)]
http://www.whizkunde.org | stan@whizkunde.org

----------------------------------------------------------
Release date: April 27th 2001

Subject: PerlCal (CGI) security problem

Systems affected: *NIX (not windows) systems running
PerlCal CGI script

Vendor: http://www.perlcal.com
----------------------------------------------------------

1. problem
cal_make.pl of the PerlCal script may allow remote users
(website visitors) to view any file on a webserver (depending
on the user the webserver is running on).

Regard this URL:

http://www.VULNERABLE.com/cgi-bin/cal_make.pl?
p0=../../../../../../../../../../../../etc/passwd%00
This will display the /etc/passwd (if the webserver user has
access to this file).

2. fix
I warned the PerlCal vendor three weeks ago. After a
reaction, I gave him some time and tips to release a fix.
Because the vendor still hasn't fixed the problem and because
he didn't notice me why he hasn't released a patch yet, I
released this advisory.
I really hope the vendor will release a patch in the very
near future.
In the meantime it might be a good idea to just chmod 000
your PerlCal scripts.

----------------------------------------------------------
Stan a.k.a. ThePike
stan@whizkunde.org
http://www.whizkunde.org

Copyright whizkunde security team 2001

 
 


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