HTML Purifier CSS Multiple Cross-Site Scripting Vulnerabilities

Bugtraq ID:	29886
Class:	Input Validation Error
CVE:
Remote:	Yes
Local:	No
Published:	Jun 23 2008 12:00AM
Updated:	Jun 24 2008 07:11PM
Credit:	The vendor disclosed these issues.
Vulnerable:	Edward Z. Yang HTML Purifier 2.0.1 Edward Z. Yang HTML Purifier 2.0 Edward Z. Yang HTML Purifier 3.1 Edward Z. Yang HTML Purifier 2.1
Not Vulnerable:	Edward Z. Yang HTML Purifier 3.1.1 Edward Z. Yang HTML Purifier 2.1.5

HTML Purifier CSS Multiple Cross-Site Scripting Vulnerabilities

HTML Purifier is prone to multiple cross-site scripting vulnerabilities because the application fails to properly sanitize user-supplied input.

An attacker may leverage these issues to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This may help the attacker steal cookie-based authentication credentials and launch other attacks.

Versions prior to HTML Purifier 2.1.5 and 3.1.1 are affected.

HTML Purifier CSS Multiple Cross-Site Scripting Vulnerabilities

An attacker can exploit these issues by enticing an unsuspecting user to follow a malicious URI.

HTML Purifier CSS Multiple Cross-Site Scripting Vulnerabilities

Solution:
The vendor has released fixes. Please see the references for more information.


Edward Z. Yang HTML Purifier 3.1

• Edward Z. Yang htmlpurifier-3.1.1.tar.gz
  http://htmlpurifier.org/releases/htmlpurifier-3.1.1.tar.gz

Edward Z. Yang HTML Purifier 2.1

• Edward Z. Yang htmlpurifier-2.1.5.tar.gz
  http://htmlpurifier.org/releases/htmlpurifier-2.1.5.tar.gz

Edward Z. Yang HTML Purifier 2.0

• Edward Z. Yang htmlpurifier-2.1.5.tar.gz
  http://htmlpurifier.org/releases/htmlpurifier-2.1.5.tar.gz

Edward Z. Yang HTML Purifier 2.0.1

• Edward Z. Yang htmlpurifier-2.1.5.tar.gz
  http://htmlpurifier.org/releases/htmlpurifier-2.1.5.tar.gz

HTML Purifier CSS Multiple Cross-Site Scripting Vulnerabilities

References:

• HTML Purifier 3.1.1 released (Edward Z. Yang)
  
• HTML Purifier Homepage (Edward Z. Yang)