The (1) CHAP and (2) MS-CHAP-V2 authentication capabilities in the PPP Access Concentrator (PPPAC) function in Internet Initiative Japan SEIL/B1 firmware 1.00 through 2.52 use the same challenge for each authentication attempt, which allows remote attackers to bypass authentication via a replay attack.
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 |
|---|---|---|---|
| Seil/b1 | Iij | 1.00 (including) | 1.00 (including) |
| Seil/b1 | Iij | 2.01 (including) | 2.01 (including) |
| Seil/b1 | Iij | 2.10 (including) | 2.10 (including) |
| Seil/b1 | Iij | 2.20 (including) | 2.20 (including) |
| Seil/b1 | Iij | 2.30 (including) | 2.30 (including) |
| Seil/b1 | Iij | 2.40 (including) | 2.40 (including) |
| Seil/b1 | Iij | 2.41 (including) | 2.41 (including) |
| Seil/b1 | Iij | 2.42 (including) | 2.42 (including) |
| Seil/b1 | Iij | 2.50 (including) | 2.50 (including) |
| Seil/b1 | Iij | 2.51 (including) | 2.51 (including) |
| Seil/b1 | Iij | 2.52 (including) | 2.52 (including) |