VyOS restricted-shell Escape / Privilege Escalation
Posted on 21 September 2020
This Metasploit module exploits command injection vulnerabilities and an insecure default sudo configuration on VyOS versions 1.0.0 through 1.1.8 to execute arbitrary system commands as root. VyOS features a restricted-shell system shell intended for use by low privilege users with operator privileges. This module exploits a vulnerability in the telnet command to break out of the restricted shell, then uses sudo to exploit a command injection vulnerability in /opt/vyatta/bin/sudo-users/vyatta-show-lldp.pl to execute commands with root privileges. This module has been tested successfully on VyOS 1.1.8 amd64 and VyOS 1.0.0 i386.
