transport.py in the SSH server implementation of Paramiko before 1.17.6, 1.18.x before 1.18.5, 2.0.x before 2.0.8, 2.1.x before 2.1.5, 2.2.x before 2.2.3, 2.3.x before 2.3.2, and 2.4.x before 2.4.1 does not properly check whether authentication is completed before processing other requests, as demonstrated by channel-open. A customized SSH client can simply skip the authentication step.
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Paramiko | Paramiko | * | 1.17.6 (excluding) |
| Paramiko | Paramiko | 1.18.0 (including) | 1.18.5 (excluding) |
| Paramiko | Paramiko | 2.0.0 (including) | 2.0.8 (excluding) |
| Paramiko | Paramiko | 2.1.0 (including) | 2.1.5 (excluding) |
| Paramiko | Paramiko | 2.2.0 (including) | 2.2.3 (excluding) |
| Paramiko | Paramiko | 2.3.0 (including) | 2.3.2 (excluding) |
| Paramiko | Paramiko | 2.4.0 (including) | 2.4.0 (including) |