xrdp 0.9.1 calls the PAM function auth_start_session() in an incorrect location, leading to PAM session modules not being properly initialized, with a potential consequence of incorrect configurations or elevation of privileges, aka a pam_limits.so bypass.
Weakness
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Xrdp | Neutrinolabs | 0.9.1 (including) | 0.9.1 (including) |
| Xrdp | Ubuntu | artful | * |
| Xrdp | Ubuntu | esm-apps/xenial | * |
| Xrdp | Ubuntu | esm-infra-legacy/trusty | * |
| Xrdp | Ubuntu | precise | * |
| Xrdp | Ubuntu | trusty | * |
| Xrdp | Ubuntu | trusty/esm | * |
| Xrdp | Ubuntu | upstream | * |
| Xrdp | Ubuntu | xenial | * |
| Xrdp | Ubuntu | yakkety | * |
| Xrdp | Ubuntu | zesty | * |
Potential Mitigations
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/114.html
- https://cwe.mitre.org/data/definitions/115.html
- https://cwe.mitre.org/data/definitions/151.html
- https://cwe.mitre.org/data/definitions/194.html
- https://cwe.mitre.org/data/definitions/22.html
- https://cwe.mitre.org/data/definitions/57.html
- https://cwe.mitre.org/data/definitions/593.html
- https://cwe.mitre.org/data/definitions/633.html
- https://cwe.mitre.org/data/definitions/650.html
- https://cwe.mitre.org/data/definitions/94.html
References
- https://bugs.launchpad.net/ubuntu/+source/xrdp/+bug/1672742
- https://github.com/neutrinolabs/xrdp/issues/350
- https://github.com/neutrinolabs/xrdp/pull/694
- https://bugs.launchpad.net/ubuntu/+source/xrdp/+bug/1672742
- https://github.com/neutrinolabs/xrdp/issues/350
- https://github.com/neutrinolabs/xrdp/pull/694