An Authentication Bypass by Primary Weakness
in the FTP server of Juniper Networks Junos OS allows an unauthenticated, network-based attacker to get limited read-write access to files on the device. When the FTP server is enabled and a user named ftp or anonymous is configured, that user can login without providing the configured password and then has read-write access to their home directory.
This issue affects Junos OS:
- all versions before 22.4R3-S8,
- 23.2 versions before 23.2R2-S3,
- 23.4 versions before 23.4R2.
Weakness
The authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Junos | Juniper | * | 22.4 (excluding) |
| Junos | Juniper | 22.4 (including) | 22.4 (including) |
| Junos | Juniper | 22.4-r1 (including) | 22.4-r1 (including) |
| Junos | Juniper | 22.4-r1-s1 (including) | 22.4-r1-s1 (including) |
| Junos | Juniper | 22.4-r1-s2 (including) | 22.4-r1-s2 (including) |
| Junos | Juniper | 22.4-r2 (including) | 22.4-r2 (including) |
| Junos | Juniper | 22.4-r2-s1 (including) | 22.4-r2-s1 (including) |
| Junos | Juniper | 22.4-r2-s2 (including) | 22.4-r2-s2 (including) |
| Junos | Juniper | 22.4-r3 (including) | 22.4-r3 (including) |
| Junos | Juniper | 22.4-r3-s1 (including) | 22.4-r3-s1 (including) |
| Junos | Juniper | 22.4-r3-s2 (including) | 22.4-r3-s2 (including) |
| Junos | Juniper | 22.4-r3-s3 (including) | 22.4-r3-s3 (including) |
| Junos | Juniper | 22.4-r3-s4 (including) | 22.4-r3-s4 (including) |
| Junos | Juniper | 22.4-r3-s5 (including) | 22.4-r3-s5 (including) |
| Junos | Juniper | 22.4-r3-s6 (including) | 22.4-r3-s6 (including) |
| Junos | Juniper | 22.4-r3-s7 (including) | 22.4-r3-s7 (including) |
| Junos | Juniper | 23.2 (including) | 23.2 (including) |
| Junos | Juniper | 23.2-r1 (including) | 23.2-r1 (including) |
| Junos | Juniper | 23.2-r1-s1 (including) | 23.2-r1-s1 (including) |
| Junos | Juniper | 23.2-r1-s2 (including) | 23.2-r1-s2 (including) |
| Junos | Juniper | 23.2-r2 (including) | 23.2-r2 (including) |
| Junos | Juniper | 23.2-r2-s1 (including) | 23.2-r2-s1 (including) |
| Junos | Juniper | 23.2-r2-s2 (including) | 23.2-r2-s2 (including) |
| Junos | Juniper | 23.4 (including) | 23.4 (including) |
| Junos | Juniper | 23.4-r1 (including) | 23.4-r1 (including) |
| Junos | Juniper | 23.4-r1-s1 (including) | 23.4-r1-s1 (including) |
| Junos | Juniper | 23.4-r1-s2 (including) | 23.4-r1-s2 (including) |