CVE-2014-5347

Multiple cross-site request forgery (CSRF) vulnerabilities in the Disqus Comment System plugin before 2.76 for WordPress allow remote attackers to hijack the authentication of administrators for requests that conduct cross-site scripting (XSS) attacks via the (1) disqus_replace, (2) disqus_public_key, or (3) disqus_secret_key parameter to wp-admin/edit-comments.php in manage.php or that (4) reset or (5) delete plugin options via the reset parameter to wp-admin/edit-comments.php.

Weakness

The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request.

Affected Software

Potential Mitigations

• Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
• For example, use anti-CSRF packages such as the OWASP CSRFGuard. [REF-330]
• Another example is the ESAPI Session Management control, which includes a component for CSRF. [REF-45]
• Use the “double-submitted cookie” method as described by Felten and Zeller:
• When a user visits a site, the site should generate a pseudorandom value and set it as a cookie on the user’s machine. The site should require every form submission to include this value as a form value and also as a cookie value. When a POST request is sent to the site, the request should only be considered valid if the form value and the cookie value are the same.
• Because of the same-origin policy, an attacker cannot read or modify the value stored in the cookie. To successfully submit a form on behalf of the user, the attacker would have to correctly guess the pseudorandom value. If the pseudorandom value is cryptographically strong, this will be prohibitively difficult.
• This technique requires Javascript, so it may not work for browsers that have Javascript disabled. [REF-331]

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/111.html
• https://cwe.mitre.org/data/definitions/462.html
• https://cwe.mitre.org/data/definitions/467.html
• https://cwe.mitre.org/data/definitions/62.html

References

• http://packetstormsecurity.com/files/127847/WordPress-Disqus-2.7.5-CSRF-Cross-Site-Scripting.html
• http://packetstormsecurity.com/files/127852/Disqus-2.7.5-Cross-Site-Request-Forgery-Cross-Site-Scripting.html
• http://seclists.org/fulldisclosure/2014/Aug/35
• http://www.exploit-db.com/exploits/34336
• http://www.securityfocus.com/bid/69205
• https://exchange.xforce.ibmcloud.com/vulnerabilities/95288
• https://exchange.xforce.ibmcloud.com/vulnerabilities/95289
• https://gist.github.com/nikcub/cb5dc7a5464276c8424a
• https://wordpress.org/plugins/disqus-comment-system/other_notes
• https://www.nikcub.com/posts/multiple-vulnerabilities-in-disqus-wordpress-plugin