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SSH Tectia Server versions 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 are vulnerable to authentication bypass when old-style password authentication is enabled. Remote attackers can exploit the SSH USERAUTH CHANGE REQUEST feature by crafting a session that submits blank passwords, as demonstrated by a root login from a modified OpenSSH client with an added input_userauth_passwd_changereq call in sshconnect2.c. This allows attackers to bypass authentication controls and gain unauthorized access.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository contains a single Metasploit module: 'tectia_passwd_changereq.rb', which exploits CVE-2012-5975, a critical authentication bypass vulnerability in Tectia SSH server for Unix (version 6.3 and prior, specific builds). The exploit abuses a flaw in the handling of SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ requests, allowing a remote attacker to bypass authentication and gain root access. The module is written in Ruby and leverages Metasploit's Remote::Tcp and Remote::SSH mixins. It checks the SSH banner to determine the version and build, then attempts the exploit by sending crafted authentication packets. If successful, it provides an interactive root shell to the attacker. The only network endpoint involved is the SSH service (default TCP port 22) on the target. The module is operational and ready for use within the Metasploit framework.
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