CVE-2024-8463: Phpgurukul Job Portal RCE Vulnerability

CVE-2024-8463 Overview

CVE-2024-8463 is a file upload restriction bypass vulnerability in PHPGurukul Job Portal 1.0. An authenticated attacker can bypass upload filters and place a webshell on the server, enabling remote code execution (RCE). The flaw is classified under [CWE-434] (Unrestricted Upload of File with Dangerous Type). The vulnerability affects a web application commonly used to demonstrate PHP-based recruitment portals.

Critical Impact
Authenticated attackers can gain remote code execution on the underlying web server by uploading a webshell, leading to full compromise of confidentiality, integrity, and availability.

Affected Products

PHPGurukul Job Portal 1.0
Deployments exposing the portal to authenticated users
Web servers hosting the vulnerable PHP application

Discovery Timeline

2024-09-05 - CVE-2024-8463 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-8463

Vulnerability Analysis

The vulnerability resides in the file upload handling logic of PHPGurukul Job Portal 1.0. The application accepts file submissions from authenticated users but fails to enforce sufficient restrictions on file type, extension, or content. An attacker who holds valid credentials, such as a registered job seeker or employer account, can submit a crafted file that the server subsequently interprets as PHP code.

Once a webshell is written into a directory accessible by the web server, the attacker can invoke it via an HTTP request. This grants command execution in the security context of the web server process. From that position, attackers typically pivot to database credentials, harvest session data, and stage additional payloads. The INCIBE Security Notice tracks this issue among multiple flaws affecting the product.

Root Cause

The root cause is improper validation of uploaded files ([CWE-434]). The application relies on client-supplied metadata such as file extensions or MIME types rather than verifying the actual file content and restricting execution in the upload directory. This allows PHP payloads to be stored with executable extensions and served by the PHP interpreter.

Attack Vector

Exploitation requires network access to the portal and a valid user session. The attacker logs in, submits a malicious file through an upload endpoint such as a profile picture or resume upload, and then requests the uploaded file directly. The server executes the embedded PHP code, returning attacker-controlled command output.

No verified public proof-of-concept code is available. See the INCIBE Security Notice for additional technical detail.

Detection Methods for CVE-2024-8463

Indicators of Compromise

Unexpected .php, .phtml, or .phar files present in upload directories such as those used for resumes or profile images
HTTP GET requests to files inside upload directories that return dynamic content or command output
Web server process spawning shell interpreters (sh, bash, cmd.exe) or reconnaissance binaries (whoami, id, net)
Outbound network connections initiated by the PHP interpreter to attacker-controlled infrastructure

Detection Strategies

Monitor file writes to web-accessible directories and alert on newly created files with executable script extensions
Inspect HTTP POST bodies to upload endpoints for PHP tags (<?php) or common webshell signatures
Correlate authenticated user sessions with subsequent process creation events on the web server host

Monitoring Recommendations

Enable verbose access logging on the Job Portal application and retain logs for post-incident review
Baseline the contents of upload directories and alert on deviations
Monitor child processes of the web server (httpd, nginx, php-fpm) for shell activity

How to Mitigate CVE-2024-8463

Immediate Actions Required

Restrict access to the Job Portal to trusted networks until a vendor-supplied fix is applied
Audit upload directories and remove any files not matching expected image or document formats
Rotate credentials for all portal users and any accounts reachable from a compromised web server
Review web server and database logs for signs of exploitation dating back to deployment

Patch Information

No vendor patch is listed in the referenced advisories at the time of publication. Track the INCIBE Security Notice and the PHPGurukul project for updates. Organizations should consider replacing the application with a maintained alternative if a fix is not released.

Workarounds

Configure the web server to disable PHP execution within upload directories using directives such as php_admin_flag engine off or equivalent location blocks
Enforce server-side validation of file content using magic-byte inspection and reject files that do not match an allowlist of MIME types
Rename uploaded files to non-executable extensions and store them outside the document root
Place a web application firewall in front of the portal with rules that block requests containing PHP tags in multipart uploads

bash

# Example Apache configuration to disable PHP execution in an uploads directory
<Directory "/var/www/jobportal/uploads">
    php_admin_flag engine off
    AddType text/plain .php .phtml .php3 .php4 .php5 .phar
    Options -ExecCGI
</Directory>