The Authentication Proxy feature in Cisco IOS does not properly handle invalid AAA return codes from RADIUS and TACACS+ servers, which allows remote attackers to bypass authentication in opportunistic circumstances via a connection attempt that triggers an invalid code, as demonstrated by a connection attempt with a blank password, aka Bug IDs CSCuo09400 and CSCun16016.
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 |
|---|---|---|---|
| Ios | Cisco | 15.4(1)t (including) | 15.4(1)t (including) |
| Ios | Cisco | 15.4(1)t1 (including) | 15.4(1)t1 (including) |
| Ios | Cisco | 15.4(1)t2 (including) | 15.4(1)t2 (including) |
| Ios | Cisco | 15.4(1)t3 (including) | 15.4(1)t3 (including) |
| Ios | Cisco | 15.4(1)t4 (including) | 15.4(1)t4 (including) |
| Ios | Cisco | 15.4(2)t (including) | 15.4(2)t (including) |
| Ios | Cisco | 15.4(2)t1 (including) | 15.4(2)t1 (including) |
| Ios | Cisco | 15.4(2)t2 (including) | 15.4(2)t2 (including) |
| Ios | Cisco | 15.4(2)t3 (including) | 15.4(2)t3 (including) |
| Ios | Cisco | 15.4(100)t (including) | 15.4(100)t (including) |
| Ios | Cisco | 15.4t (including) | 15.4t (including) |
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
- http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2015-0607
- http://tools.cisco.com/security/center/viewAlert.x?alertId=37711
- http://www.securityfocus.com/bid/72794
- http://www.securitytracker.com/id/1031817
- http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2015-0607
- http://tools.cisco.com/security/center/viewAlert.x?alertId=37711
- http://www.securityfocus.com/bid/72794
- http://www.securitytracker.com/id/1031817