Description
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.
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Metasploit 1 module
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Tectia SSH USERAUTH Change Request Password Reset Vulnerability
exploit/unix/ssh/tectia_passwd_changereq
Exploit-DB 2
- (SSH.com Communications) SSH Tectia - USERAUTH Change Request Password Reset (Metasploit) EDB-23156 · remote · Dec 5, 2012 · verified
- (SSH.com Communications) SSH Tectia (SSH < 2.0-6.1.9.95 / Tectia 6.1.9.95) - Remote Authentication Bypass EDB-23082 · remote · Dec 2, 2012 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- 23082 exploit
- 20121203 Re: SSH.com Communications SSH Tectia Authentication Bypass Remote Zeroday Exploit (king cope) mailing-list
- 20121201 SSH.com Communications SSH Tectia Authentication Bypass Remote Zeroday Exploit mailing-list
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/unix/ssh/tectia_passwd_changereq.rb