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Bugs fixed in Version 1.4.3
From: Joxean Koret <joxeankoret () yahoo es>
Date: 22 Aug 2004 17:56:32 -0000

In-Reply-To: <20040820225036.17877.qmail () www securityfocus com>

 
B. Unspecified File Download Vulnerability  
 
B1. An error in the MyDMS software allows to a  
registered users (and only to  
registered users) to download any file, such  
as /etc/passwd, by inserting in a   
parameter a text such as ../../../../../etc/passwd.  
Contact:  
 
The author has released a new version (1.4.3) 
that solves the problem avoid arbitrary file 
download. 
 
Problem Description : 
~~~~~~~~~~~~~~~~~ 
 
When do you want to download any file stored in 
MyDMS internally calls to a PHP script (called 
op.ViewOnline.php). 
 
The Parameter 'request' of this script is a field 
with 3 parts, separated by the ':' char. 
 
The first part is the DocumentID (DocumentID in 
database). The second part is the Document 
Version. The thirst part is the document name. 
 
I don't know why the author uses the thirst part 
(the document name), because he has the 
DocumentID to retrieve it (or it's name) from the 
MySQL Database server. 
 
The problem is the following : If you change the 
document name with, in 
example, ../../../../../etc/passwd, you will download 
the file /etc/passwd from the Web Server. 
 
To try the vulnerability follow these steps :  
 
1.- Login in to MyDMS 
2.- Enter the following URL in your browser :  
 
http://<site-with-mydms>/mydms/op/op.ViewOnline.php?request=4:6:/../../../../../../../../../../../../etc/passwd 
 
Where '4' is the document id and '6' is the 
document version. 
 
You need to known a valid document id and a 
valid document version as well as you need an 
account in the MyDMS system, but an user with 
this data may download any file that he/she 
wants. 
 
Bye 


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