WordPress Multiple Vulnerabilities
Secunia Advisory: SA26771
Release Date: 2007-09-12
Last Update: 2008-05-14
Popularity: 8,949 views

Critical:
Moderately critical
Impact: Security Bypass
Cross Site Scripting
Manipulation of data
Where: From remote
Solution Status: Vendor Patch

Software:WordPress 2.x
WordPress MU 1.x

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CVE reference:CVE-2007-4893
CVE-2007-4894
CVE-2008-2146


Description:
Some vulnerabilities have been reported in WordPress, which can be exploited by malicious users to conduct script insertion attacks and bypass certain security restrictions, and by malicious people to conduct SQL injection attacks.

1) The "unfiltered_html" privilege feature can be bypassed by adding a field named "no_filter". This can be exploited by malicious users without the "unfiltered_html" privilege to e.g. post blog entries with arbitrary HTML and script code via specially crafted POST requests.

2) Input passed to certain parameters (e.g. the "post_type" parameter of the URL passed to the "pingback.extensions.getPingbacks()" XMLRPC method) is not properly sanitised before being used in SQL queries. This can be exploited to manipulate SQL queries by injecting arbitrary SQL code.

3) A vulnerability is caused due to improper access restriction. This can be exploited to bypass the authentication mechanism and e.g. switch themes or activate/deactivate plugins without valid administrator credentials, by passing malicious data in the "PATH_INFO" part of a URL.

Successful exploitation of this vulnerability requires valid user credentials.

The vulnerabilities are reported in Wordpress prior to 2.2.3 and Wordpress MU prior to 1.2.5a.

Solution:
Update to Wordpress version 2.2.3 or Wordpress MU version 1.2.5a.

Provided and/or discovered by:
1) xknown
2) Alexander Concha, buayacorp.com
3) xknown

Changelog:
2007-09-18: Added CVE reference.
2008-05-14: Added vulnerability #3. Added CVE reference.

Original Advisory:
1) http://trac.wordpress.org/ticket/4720
2) http://www.buayacorp.com/files/wordpress/wordpress-sql-injection-advisory.html
3) http://trac.wordpress.org/ticket/4748


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