module

VyOS restricted-shell Escape and Privilege Escalation

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Disclosed
2018-11-05
Created
2020-09-19

Description

This module exploits command injection vulnerabilities and an insecure
default sudo configuration on VyOS versions 1.0.0 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.

Authors

Rich Mirch
bcoles bcoles@gmail.com

Platform

Unix

Architectures

cmd

References

Module Options

To display the available options, load the module within the Metasploit console and run the commands ‘show options’ or ‘show advanced’:


    msf > use exploit/linux/ssh/vyos_restricted_shell_privesc
    msf exploit(vyos_restricted_shell_privesc) > show targets
        ...targets...
    msf exploit(vyos_restricted_shell_privesc) > set TARGET < target-id >
    msf exploit(vyos_restricted_shell_privesc) > show options
        ...show and set options...
    msf exploit(vyos_restricted_shell_privesc) > exploit
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