Multiple cross-site request forgery (CSRF) vulnerabilities in e107_admin/download.php in e107 1.0.2 allow remote attackers to hijack the authentication of administrators for requests that conduct SQL injection attacks via the (1) download_url, (2) download_url_extended, (3) download_author_email, (4) download_author_website, (5) download_image, (6) download_thumb, (7) download_visible, or (8) download_class parameter.
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 |
|---|---|---|---|
| E107 | E107 | 1.0.2 (including) | 1.0.2 (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://e107.org/changelog
- http://e107.svn.sourceforge.net/viewvc/e107/trunk/e107_0.7/e107_admin/download.php?sortdir=down\u0026r1=13037\u0026r2=13058\u0026sortby=rev
- http://www.exploit-db.com/exploits/23829/
- http://e107.org/changelog
- http://e107.svn.sourceforge.net/viewvc/e107/trunk/e107_0.7/e107_admin/download.php?sortdir=down\u0026r1=13037\u0026r2=13058\u0026sortby=rev
- http://www.exploit-db.com/exploits/23829/