CVE-2014-4717

Multiple cross-site request forgery (CSRF) vulnerabilities in the Simple Share Buttons Adder plugin before 4.5 for WordPress allow remote attackers to hijack the authentication of administrators for requests that conduct cross-site scripting (XSS) attacks via the (1) ssba_share_text parameter in a save action to wp-admin/options-general.php, which is not properly handled in the homepage, and unspecified vectors related to (2) Pages, (3) Posts, (4) Category/Archive pages or (5) post Excerpts.

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/127238/WordPress-Simple-Share-Buttons-Adder-4.4-CSRF-XSS.html
• http://seclists.org/fulldisclosure/2014/Jun/138
• https://security.dxw.com/advisories/csrf-and-stored-xss-in-simple-share-buttons-adder
• https://wordpress.org/plugins/simple-share-buttons-adder/changelog