Multiple cross-site request forgery (CSRF) vulnerabilities in LetoDMS (formerly MyDMS) 1.7.2 and earlier allow remote attackers to hijack the authentication of administrators for requests that use (1) op/op.EditUserData.php, (2) op/op.UsrMgr.php, (3) out/out.RemoveVersion.php, (4) op/op.RemoveFolder.php, (5) op/op.DefaultKeywords.php, (6) op/op.GroupMgr.php, (7) op/op.FolderAccess.php, (8) op/op.FolderNotify.php, or (9) op.MoveFolder.php in mydms.
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 |
| Letodms |
Letodms |
* |
1.7.2 (including) |
| Letodms |
Letodms |
1.5.0 (including) |
1.5.0 (including) |
| Letodms |
Letodms |
1.5.0-b (including) |
1.5.0-b (including) |
| Letodms |
Letodms |
1.5.1 (including) |
1.5.1 (including) |
| Letodms |
Letodms |
1.6.0-b (including) |
1.6.0-b (including) |
| Letodms |
Letodms |
1.7.0 (including) |
1.7.0 (including) |
| Mydms |
Ubuntu |
dapper |
* |
| Mydms |
Ubuntu |
hardy |
* |
| Mydms |
Ubuntu |
karmic |
* |
| Mydms |
Ubuntu |
lucid |
* |
| Mydms |
Ubuntu |
maverick |
* |
| Mydms |
Ubuntu |
natty |
* |
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