In versions 15.1.0-15.1.0.4, 15.0.0-15.0.1.3, 14.1.0-14.1.2.6, 13.1.0-13.1.3.4, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.1, BIG-IP ASM Configuration utility CSRF protection token can be reused multiple times.
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
| Name |
Vendor |
Start Version |
End Version |
| Big-ip_application_security_manager |
F5 |
11.5.2 (including) |
11.6.5 (excluding) |
| Big-ip_application_security_manager |
F5 |
12.1.0 (including) |
12.1.5.2 (excluding) |
| Big-ip_application_security_manager |
F5 |
13.1.0 (including) |
13.1.3 (excluding) |
| Big-ip_application_security_manager |
F5 |
14.1.0 (including) |
14.1.2.7 (excluding) |
| Big-ip_application_security_manager |
F5 |
15.0.0 (including) |
15.0.1.4 (excluding) |
| Big-ip_application_security_manager |
F5 |
15.1.0 (including) |
15.1.0.5 (excluding) |
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]
References