The SSH USERAUTH CHANGE REQUEST feature in SSH Tectia Server 6.0.4 through 6.0.20, 6.1.0 through 6.1.12, 6.2.0 through 6.2.5, and 6.3.0 through 6.3.2 on UNIX and Linux, when old-style password authentication is enabled, allows remote attackers to bypass authentication via a crafted session involving entry of blank passwords, as demonstrated by a root login session from a modified OpenSSH client with an added input_userauth_passwd_changereq call in sshconnect2.c.
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 |
|---|---|---|---|
| Tectia_server | Ssh | 6.0.4 (including) | 6.0.4 (including) |
| Tectia_server | Ssh | 6.0.5 (including) | 6.0.5 (including) |
| Tectia_server | Ssh | 6.0.6 (including) | 6.0.6 (including) |
| Tectia_server | Ssh | 6.0.7 (including) | 6.0.7 (including) |
| Tectia_server | Ssh | 6.0.8 (including) | 6.0.8 (including) |
| Tectia_server | Ssh | 6.0.9 (including) | 6.0.9 (including) |
| Tectia_server | Ssh | 6.0.10 (including) | 6.0.10 (including) |
| Tectia_server | Ssh | 6.0.11 (including) | 6.0.11 (including) |
| Tectia_server | Ssh | 6.0.12 (including) | 6.0.12 (including) |
| Tectia_server | Ssh | 6.0.13 (including) | 6.0.13 (including) |
| Tectia_server | Ssh | 6.0.14 (including) | 6.0.14 (including) |
| Tectia_server | Ssh | 6.0.17 (including) | 6.0.17 (including) |
| Tectia_server | Ssh | 6.0.18 (including) | 6.0.18 (including) |
| Tectia_server | Ssh | 6.0.19 (including) | 6.0.19 (including) |
| Tectia_server | Ssh | 6.0.20. (including) | 6.0.20. (including) |
| Tectia_server | Ssh | 6.1.0 (including) | 6.1.0 (including) |
| Tectia_server | Ssh | 6.1.1 (including) | 6.1.1 (including) |
| Tectia_server | Ssh | 6.1.2 (including) | 6.1.2 (including) |
| Tectia_server | Ssh | 6.1.3 (including) | 6.1.3 (including) |
| Tectia_server | Ssh | 6.1.4 (including) | 6.1.4 (including) |
| Tectia_server | Ssh | 6.1.5 (including) | 6.1.5 (including) |
| Tectia_server | Ssh | 6.1.6 (including) | 6.1.6 (including) |
| Tectia_server | Ssh | 6.1.7 (including) | 6.1.7 (including) |
| Tectia_server | Ssh | 6.1.8 (including) | 6.1.8 (including) |
| Tectia_server | Ssh | 6.1.9 (including) | 6.1.9 (including) |
| Tectia_server | Ssh | 6.1.12 (including) | 6.1.12 (including) |
| Tectia_server | Ssh | 6.2.0 (including) | 6.2.0 (including) |
| Tectia_server | Ssh | 6.2.1 (including) | 6.2.1 (including) |
| Tectia_server | Ssh | 6.2.2 (including) | 6.2.2 (including) |
| Tectia_server | Ssh | 6.2.3 (including) | 6.2.3 (including) |
| Tectia_server | Ssh | 6.2.4 (including) | 6.2.4 (including) |
| Tectia_server | Ssh | 6.2.5 (including) | 6.2.5 (including) |
| Tectia_server | Ssh | 6.3.0 (including) | 6.3.0 (including) |
| Tectia_server | Ssh | 6.3.1 (including) | 6.3.1 (including) |
| Tectia_server | Ssh | 6.3.2 (including) | 6.3.2 (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://archives.neohapsis.com/archives/fulldisclosure/2012-12/0013.html
- http://archives.neohapsis.com/archives/fulldisclosure/2012-12/0065.html
- http://www.exploit-db.com/exploits/23082/
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/unix/ssh/tectia_passwd_changereq.rb
- http://archives.neohapsis.com/archives/fulldisclosure/2012-12/0013.html
- http://archives.neohapsis.com/archives/fulldisclosure/2012-12/0065.html
- http://www.exploit-db.com/exploits/23082/
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/unix/ssh/tectia_passwd_changereq.rb