[DSECRG-08-008] Textpattern 4.0.5 Multiple Security Vulnerabilities Feb 04 2008 05:18PM
Digital Security Research Group (research dsec ru)

Digital Security Research Group [DSecRG] Advisory #DSECRG-08-008

Application: Txp CMS
Versions Affected: 4.0.5
Vendor URL: http://www.textpattern.com
Bugs: DOS, multiple XSS, etc.
Exploits: YES
Reported: 11.01.2008
Vendor response: 14.01.2008
Patch Released: 03.02.2008
Date of Public Advisory: 04.02.2008
Authors: Alexandr Polyakov, Stas Svistunovich
Digital Security Research Group [DSecRG] (research [at] dsec [dot] ru)


Textpattern system has multiple security vulnerabilities:

1. Parameter Value Overflow
2. Linked XSS
3. XSS in POST
4. Stored XSS
5. Insecure password changing algorithm


1. Parameter Value Overflow

Vulnerability found in script index.php in comments section. Post parameter "message".

The application does not ensure that the parameter value length. It can be used for performing a DOS attack.


message = [A]x10000


2. Linked XSS vulnerability found in /textpattern/setup/index.php, attacker can inject XSS in URL string.


('DSecRG XSS')</script>


3. XSS in POST

Vulnerability found in script index.php in comments section. Post parameter "name".


name = <img src="javascript:alert('DSecRG XSS')">

name = <script>alert('DSecRG XSS')</script>


4. Stored XSS

Vulnerability found in script textpattern/index.php?event=article in post parameter "Body".


Body = <IMG SRC=javascript:alert("DSecRG_XSS")>


5. Insecure password changing algorithm

Previous password not required to set a new password.

If attacker gain access to admin session by using XSS vulnerability, he can change admin password without knowing old password.

It will be more secure to ask old password when changing password or primary email.

Fix Information

Textpattern was altered to fix this flaw on 03.02.2008. Updated version (4.0.6) can be downloaded here:


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