CVE-2024-58313: Xbtitfm File Upload RCE Vulnerability

CVE-2024-58313 Overview

CVE-2024-58313 is an insecure file upload vulnerability [CWE-434] in xbtitFM version 4.1.18, a PHP-based file hosting and torrent tracker application. The flaw resides in the file_hosting feature and allows authenticated attackers with administrative privileges to upload arbitrary PHP files. Attackers bypass file type restrictions by manipulating the Content-Type header, injecting GIF89a magic bytes, and using alternate PHP tags. Successful exploitation yields remote code execution on the underlying web server.

Critical Impact
Authenticated administrators can upload web shells that execute arbitrary system commands with the privileges of the PHP process.

Affected Products

xbtitFM 4.1.18
Deployments using the file_hosting feature
PHP web servers hosting the vulnerable application

Discovery Timeline

2025-12-11 - CVE-2024-58313 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-58313

Vulnerability Analysis

The vulnerability lies in xbtitFM's file_hosting upload handler, which fails to properly validate uploaded file contents and extensions. The application relies on client-controllable signals such as the Content-Type header and leading file bytes to determine whether an upload is a legitimate image. Attackers can craft a PHP payload that satisfies these superficial checks while retaining executable server-side code.

Because the uploaded file is stored under a web-accessible directory and preserves an executable extension or is interpreted by PHP, requesting the file causes the server to execute the embedded code. The attacker gains a persistent web shell capable of running arbitrary operating system commands through the web server user context.

Exploitation requires administrative authentication, which limits opportunistic attacks but remains realistic against exposed panels with weak credentials, credential reuse, or compromised admin accounts.

Root Cause

The root cause is missing server-side validation of uploaded file types [CWE-434]. The application trusts request-supplied metadata rather than performing content inspection, extension allowlisting, and safe storage outside executable paths.

Attack Vector

An authenticated administrator sends a crafted multipart upload to the file_hosting endpoint. The payload sets Content-Type: image/gif, prepends GIF89a magic bytes, and encloses PHP logic in alternate PHP tags such as <script language="php">...</script>. After upload, the attacker requests the stored file URL to trigger PHP execution and pass commands through parameters. Refer to the VulnCheck Security Advisory and Exploit-DB #51909 for the full technical writeup.

Detection Methods for CVE-2024-58313

Indicators of Compromise

Files stored in the file_hosting upload directory with .php, .phtml, or double extensions such as .gif.php.
Uploaded files whose contents begin with GIF89a but contain PHP tokens like <?php, <?=, or <script language="php">.
Outbound process execution originating from the PHP-FPM or web server user shortly after an upload event.

Detection Strategies

Inspect web server access logs for POST requests to file_hosting endpoints followed by GET requests to newly created files under the uploads directory.
Perform content scanning on the uploads directory for PHP tags embedded inside files declared as images.
Correlate administrative logins from unusual IPs with subsequent upload activity to surface account takeover patterns.

Monitoring Recommendations

Enable file integrity monitoring on the xbtitFM webroot and any user-writable upload directories.
Alert on shell command execution (sh, bash, cmd, powershell, curl, wget) spawned by the web server process.
Log and review all administrative authentication events, focusing on failed logins and geographic anomalies.

How to Mitigate CVE-2024-58313

Immediate Actions Required

Restrict access to the xbtitFM administrative interface using network ACLs, VPN, or IP allowlists.
Rotate all administrator credentials and enforce multi-factor authentication where supported.
Audit the uploads directory for unexpected files and remove any suspected web shells.

Patch Information

No vendor patch is referenced in the NVD entry for CVE-2024-58313 at the time of publication. Monitor the XBTITFM Official Website and the VulnCheck Security Advisory for updates. Until a fix is released, treat all 4.1.18 deployments as vulnerable.

Workarounds

Disable the file_hosting feature entirely if it is not required for business operations.
Configure the web server to prevent PHP execution inside upload directories using directives such as php_flag engine off or an equivalent Nginx location block.
Deploy a web application firewall rule that blocks multipart uploads containing PHP tags within declared image content.

bash

# Apache: disable PHP execution in the xbtitFM uploads directory
<Directory "/var/www/xbtitfm/file_hosting/uploads">
    php_flag engine off
    RemoveHandler .php .phtml .php5
    AddType text/plain .php .phtml .php5
    Options -ExecCGI
</Directory>