CVE-2024-2571: Employee Task Management System RCE Flaw

CVE-2024-2571 Overview

A critical vulnerability has been identified in SourceCodester Employee Task Management System version 1.0, specifically affecting the /manage-admin.php file. This vulnerability is classified as an Execution After Redirect (EAR) flaw (CWE-698), which allows attackers to bypass authentication and authorization controls by continuing to execute code after a redirect instruction has been sent to the browser.

Critical Impact

This vulnerability allows remote attackers to bypass access controls and execute unauthorized administrative functions in the Employee Task Management System without proper authentication.

Affected Products

• SourceCodester Employee Task Management System 1.0
• oretnom23 Employee Task Management System 1.0

Discovery Timeline

• 2024-03-18 - CVE-2024-2571 published to NVD
• 2025-02-20 - Last updated in NVD database

Technical Details for CVE-2024-2571

Vulnerability Analysis

The Employee Task Management System contains an Execution After Redirect (EAR) vulnerability in the /manage-admin.php file. EAR vulnerabilities occur when server-side code sends a redirect response (such as a Location header) to the client but continues to execute subsequent code instead of properly terminating execution. This allows attackers who ignore the redirect instruction to access functionality that should be protected by the authentication check.

In this specific case, the vulnerable endpoint processes sensitive administrative operations even after issuing a redirect for unauthenticated users. Since the redirect is merely an HTTP header that the browser chooses to follow, an attacker using tools like curl, Burp Suite, or custom scripts can ignore the redirect and capture the full response containing the executed code output.

Root Cause

The root cause of this vulnerability is improper control flow implementation in the PHP authentication logic. When the application detects an unauthenticated user, it issues a redirect header but fails to call exit() or die() after the redirect. This allows the PHP interpreter to continue executing the remainder of the script, including administrative functions that should only be accessible to authenticated users.

The vulnerable pattern typically looks like:

if (!authenticated()) {
    header("Location: login.php");
    // Missing exit() or die() here
}
// Administrative code continues to execute

Attack Vector

The attack can be initiated remotely over the network without requiring any authentication or user interaction. An attacker can exploit this vulnerability by:

1. Making a direct HTTP request to /manage-admin.php without valid session credentials
2. Ignoring the redirect response header sent by the server
3. Processing the full HTTP response body which contains the output of the executed administrative code
4. Potentially manipulating administrative functions such as user management, task assignments, or system configuration

The exploit has been disclosed publicly, making this vulnerability particularly dangerous for unpatched installations. For technical details, see the GitHub PoC Resource.

Detection Methods for CVE-2024-2571

Indicators of Compromise

• Unusual requests to /manage-admin.php from unauthenticated sessions or unknown IP addresses
• HTTP requests that do not follow redirect responses (302/303 status codes) to the administrative endpoints
• Administrative actions logged without corresponding valid authentication events
• Access patterns showing direct navigation to admin pages bypassing the login flow

Detection Strategies

• Implement web application firewall (WAF) rules to detect requests that ignore redirect responses
• Monitor server access logs for requests to /manage-admin.php that return 200 OK status with redirect headers
• Review authentication logs for discrepancies between login events and administrative action logs
• Deploy intrusion detection signatures that identify EAR exploitation patterns

Monitoring Recommendations

• Enable detailed logging on the /manage-admin.php endpoint to capture all request parameters and session states
• Set up alerts for administrative actions performed without valid session tokens
• Monitor for automated scanning tools or penetration testing frameworks targeting the Employee Task Management System
• Implement real-time monitoring of authentication bypass attempts

How to Mitigate CVE-2024-2571

Immediate Actions Required

• Restrict access to /manage-admin.php at the web server level using IP whitelisting or VPN requirements
• Implement additional authentication checks at the web server configuration level (e.g., .htaccess or nginx location blocks)
• Consider taking the affected application offline if it handles sensitive employee data until patching is possible
• Review access logs to determine if the vulnerability has been exploited

Patch Information

No official patch has been released by the vendor (oretnom23/SourceCodester) at the time of this writing. Organizations using this software should monitor the vendor's repository and security channels for updates. For additional vulnerability context, refer to VulDB #257074.

Workarounds

• Add exit(); or die(); immediately after all redirect headers in the /manage-admin.php file and all other PHP files with authentication redirects
• Implement server-level access controls using Apache mod_authz or nginx location directives to require authentication before processing requests
• Deploy a Web Application Firewall (WAF) rule to block unauthenticated access to administrative endpoints
• Consider replacing the vulnerable application with a more secure task management solution if the vendor does not provide timely patches

# Example .htaccess configuration to restrict admin access
<Files "manage-admin.php">
    Require ip 192.168.1.0/24
    Require ip 10.0.0.0/8
</Files>

# Alternative: Require valid authentication at server level
<Location /manage-admin.php>
    AuthType Basic
    AuthName "Admin Access"
    AuthUserFile /etc/apache2/.htpasswd
    Require valid-user
</Location>