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CVE-2018-18556 is a privilege escalation vulnerability in VyOS 1.1.8, where operator users are allowed to execute the pppd binary with sudo privileges. The pppd binary's plugin option can be abused to load a malicious shared library, which, when executed, spawns a root shell. The vulnerability arises from improper validation of input parameters and overly permissive sudo rules, allowing an attacker with operator access to escalate privileges to root by leveraging the plugin loading mechanism of pppd.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a single Metasploit exploit module targeting VyOS network appliances (versions 1.0.0 through 1.1.8) running the operator-level restricted shell. The exploit leverages two vulnerabilities: (1) a command injection in the 'telnet' command to escape the restricted shell, and (2) a command injection in the sudo configuration for '/opt/vyatta/bin/sudo-users/vyatta-show-lldp.pl' to execute arbitrary commands as root. The module connects to the target via SSH (default port 22), authenticates as an operator-level user (default credentials: vyos/vyos), and attempts to break out of the restricted shell. Upon success, it executes a payload (default: reverse bash shell) as root. The exploit is operational and provides root-level code execution on vulnerable VyOS systems. The only file in the repository is a Ruby script structured as a standard Metasploit module, making use of Metasploit's SSH and reporting libraries.
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