CVE-2024-11315: Trcore DVC Path Traversal Vulnerability

CVE-2024-11315 Overview

CVE-2024-11315 is a critical vulnerability affecting TRCore DVC that combines a Path Traversal weakness with unrestricted file upload functionality. This dangerous combination allows unauthenticated remote attackers to upload arbitrary files to any directory on the affected system, ultimately enabling arbitrary code execution through the deployment of webshells.

Critical Impact

Unauthenticated attackers can achieve full remote code execution by uploading malicious webshells to arbitrary directories, potentially leading to complete system compromise without any prior authentication.

Affected Products

• TRCore DVC (all versions)

Discovery Timeline

• 2024-11-18 - CVE-2024-11315 published to NVD
• 2024-11-20 - Last updated in NVD database

Technical Details for CVE-2024-11315

Vulnerability Analysis

This vulnerability represents a compound security flaw combining two critical weaknesses: Path Traversal (CWE-22/CWE-23) and unrestricted file type uploads. The TRCore DVC application fails to properly validate and sanitize file paths during upload operations, allowing attackers to escape the intended upload directory using directory traversal sequences such as ../. Additionally, the application does not enforce restrictions on the types of files that can be uploaded, enabling attackers to upload executable content including webshells.

The combination of these flaws creates a particularly severe attack scenario. An attacker can craft a malicious request that places a webshell directly into a web-accessible directory, bypassing normal access controls entirely. Since no authentication is required to exploit this vulnerability, any network-accessible instance of the affected software is immediately at risk.

Root Cause

The root cause of this vulnerability stems from inadequate input validation on file upload functionality within the TRCore DVC application. Specifically, the application fails to:

1. Sanitize user-supplied file path components, allowing directory traversal sequences (../, ..\) to escape intended upload directories
2. Implement file type validation or allowlisting to restrict uploads to safe file types only
3. Require authentication for file upload operations

These missing security controls create a direct path from unauthenticated network access to arbitrary code execution on the underlying system.

Attack Vector

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

1. Identifying an exposed TRCore DVC instance accessible over the network
2. Crafting a file upload request containing path traversal sequences (e.g., ../../webroot/) in the filename or path parameter
3. Including a malicious webshell payload (such as PHP, JSP, or ASP code) in the upload
4. The traversal sequences allow placement of the webshell in a web-accessible directory
5. Accessing the uploaded webshell via HTTP to execute arbitrary commands on the server

The vulnerability does not require complex attack chains or additional exploitation steps, making it highly exploitable in real-world scenarios. Technical details regarding the specific endpoint and parameters involved can be found in the TW-CERT Security Advisory.

Detection Methods for CVE-2024-11315

Indicators of Compromise

• Presence of unexpected executable files (.php, .jsp, .asp, .aspx, .sh) in web-accessible directories
• Web server log entries showing upload requests containing path traversal patterns (../, ..%2f, ..%5c)
• Newly created files with suspicious names or random character strings in web directories
• Outbound network connections from the web server process to unknown external hosts

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block path traversal sequences in HTTP requests
• Implement file integrity monitoring (FIM) on web-accessible directories to alert on new file creation
• Monitor web server access logs for requests to newly created files with executable extensions
• Enable real-time threat detection using endpoint protection solutions like SentinelOne to identify webshell deployment and execution

Monitoring Recommendations

• Configure alerts for HTTP POST requests to upload endpoints containing ../ or encoded variants
• Monitor process execution chains originating from web server processes (e.g., httpd, nginx, IIS)
• Track file creation events in web document roots and adjacent directories
• Review authentication logs for post-exploitation lateral movement attempts following initial compromise

How to Mitigate CVE-2024-11315

Immediate Actions Required

• Restrict network access to TRCore DVC instances using firewall rules or network segmentation
• Place affected systems behind a reverse proxy with path traversal filtering capabilities
• Conduct a forensic review of web-accessible directories for signs of webshell deployment
• Remove any unauthorized or suspicious files discovered during the review
• Implement additional authentication requirements for upload functionality if possible

Patch Information

Organizations should contact TRCore directly for patch availability and remediation guidance. Additional information may be available through the TW-CERT Security Advisory and the TW-CERT Security Notice.

Workarounds

• Disable or restrict access to file upload functionality until a patch is available
• Implement server-side file type validation that checks file content (magic bytes), not just extensions
• Configure the web server to deny execution permissions on upload directories
• Deploy network-level controls to limit access to the affected application to trusted networks only
• Utilize application-layer firewalls to filter and block requests containing path traversal patterns

# Example: Disable script execution in upload directories (Apache)
<Directory "/var/www/uploads">
    Options -ExecCGI
    php_flag engine off
    RemoveHandler .php .phtml .php3 .php4 .php5 .phps
    AddType text/plain .php .phtml .php3 .php4 .php5 .phps
</Directory>