SSH Tectia (SSH.com Communications) Authentication Bypass Remote 0day

2012-12-02 / 2012-12-05
Credit: Kingcope
Risk: High
Local: Yes
Remote: No
CWE: CWE-287


CVSS Base Score: 9.3/10
Impact Subscore: 10/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

SSH Tectia Remote Authentication Bypass Tectia is the commercial OpenSSH solution. The product can be found at: www.tectia.com An attacker in the possession of a valid username of an SSH Tectia installation running on UNIX (verified: AIX/Linux) can login without a password. The bug is in the SSH USERAUTH CHANGE REQUEST routines which are there to allow a user to change their password. A bug in this code allows an attacker to login without a password by forcing a password change request prior to authentication. The vulnerability has been verified on UNIX operating systems and at least on this (recent) versions: - SSH-2.0-6.1.9.95 SSH Tectia Server (Latest available version from www.tectia.com) - SSH-2.0-6.0.11.5 SSH Tectia Server A default installation on Linux (version 6.1.9.95 of Tectia) is vulnerable to the attack. Kingcope

References:

http://seclists.org/fulldisclosure/2012/Dec/att-12/tectia_zip.bin


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