OpenVPN Access Server older than version 2.8.4 and version 2.9.5 generates new user authentication tokens instead of reusing exiting tokens on reconnect making it possible to circumvent the initial token expiry timestamp.
Weakness
The authentication scheme or implementation uses key data elements that are assumed to be immutable, but can be controlled or modified by the attacker.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Openvpn_access_server | Openvpn | * | 2.8.4 (excluding) |
| Openvpn_access_server | Openvpn | 2.9.0 (including) | 2.9.6 (excluding) |
| Openvpn | Ubuntu | eoan | * |
| Openvpn | Ubuntu | trusty | * |
Potential Mitigations
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/10.html
- https://cwe.mitre.org/data/definitions/13.html
- https://cwe.mitre.org/data/definitions/21.html
- https://cwe.mitre.org/data/definitions/274.html
- https://cwe.mitre.org/data/definitions/31.html
- https://cwe.mitre.org/data/definitions/39.html
- https://cwe.mitre.org/data/definitions/45.html
- https://cwe.mitre.org/data/definitions/77.html