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 cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Simple_share_buttons_adder | Sharethis | * | 4.4 (including) |
| Simple_share_buttons_adder | Sharethis | 1.0 (including) | 1.0 (including) |
| Simple_share_buttons_adder | Sharethis | 1.1 (including) | 1.1 (including) |
| Simple_share_buttons_adder | Sharethis | 1.2 (including) | 1.2 (including) |
| Simple_share_buttons_adder | Sharethis | 1.3 (including) | 1.3 (including) |
| Simple_share_buttons_adder | Sharethis | 1.4 (including) | 1.4 (including) |
| Simple_share_buttons_adder | Sharethis | 1.5 (including) | 1.5 (including) |
| Simple_share_buttons_adder | Sharethis | 1.6 (including) | 1.6 (including) |
| Simple_share_buttons_adder | Sharethis | 1.7 (including) | 1.7 (including) |
| Simple_share_buttons_adder | Sharethis | 1.8 (including) | 1.8 (including) |
| Simple_share_buttons_adder | Sharethis | 1.9 (including) | 1.9 (including) |
| Simple_share_buttons_adder | Sharethis | 2.0 (including) | 2.0 (including) |
| Simple_share_buttons_adder | Sharethis | 2.1 (including) | 2.1 (including) |
| Simple_share_buttons_adder | Sharethis | 2.2 (including) | 2.2 (including) |
| Simple_share_buttons_adder | Sharethis | 2.3 (including) | 2.3 (including) |
| Simple_share_buttons_adder | Sharethis | 2.4 (including) | 2.4 (including) |
| Simple_share_buttons_adder | Sharethis | 2.5 (including) | 2.5 (including) |
| Simple_share_buttons_adder | Sharethis | 2.6 (including) | 2.6 (including) |
| Simple_share_buttons_adder | Sharethis | 2.7 (including) | 2.7 (including) |
| Simple_share_buttons_adder | Sharethis | 2.8 (including) | 2.8 (including) |
| Simple_share_buttons_adder | Sharethis | 2.9 (including) | 2.9 (including) |
| Simple_share_buttons_adder | Sharethis | 3.0 (including) | 3.0 (including) |
| Simple_share_buttons_adder | Sharethis | 3.1 (including) | 3.1 (including) |
| Simple_share_buttons_adder | Sharethis | 3.2 (including) | 3.2 (including) |
| Simple_share_buttons_adder | Sharethis | 3.3 (including) | 3.3 (including) |
| Simple_share_buttons_adder | Sharethis | 3.4 (including) | 3.4 (including) |
| Simple_share_buttons_adder | Sharethis | 3.5 (including) | 3.5 (including) |
| Simple_share_buttons_adder | Sharethis | 3.6 (including) | 3.6 (including) |
| Simple_share_buttons_adder | Sharethis | 3.7 (including) | 3.7 (including) |
| Simple_share_buttons_adder | Sharethis | 3.8 (including) | 3.8 (including) |
| Simple_share_buttons_adder | Sharethis | 3.9 (including) | 3.9 (including) |
| Simple_share_buttons_adder | Sharethis | 4.0 (including) | 4.0 (including) |
| Simple_share_buttons_adder | Sharethis | 4.1 (including) | 4.1 (including) |
| Simple_share_buttons_adder | Sharethis | 4.2 (including) | 4.2 (including) |
| Simple_share_buttons_adder | Sharethis | 4.3 (including) | 4.3 (including) |
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 [REF-1482].
- 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
- 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