CVE-2024-11314: Trcore DVC Path Traversal Vulnerability

CVE-2024-11314 Overview

CVE-2024-11314 is a critical vulnerability affecting the DVC application from TRCore. The vulnerability combines a Path Traversal flaw (CWE-22, CWE-23) with unrestricted file upload capabilities, allowing unauthenticated remote attackers to upload arbitrary files to any directory on the target system. This dangerous combination enables attackers to achieve arbitrary code execution by uploading webshells to web-accessible directories.

Critical Impact

Unauthenticated remote attackers can exploit this vulnerability to upload malicious webshells and execute arbitrary code on vulnerable TRCore DVC installations without any authentication requirements.

Affected Products

• TRCore DVC (all versions prior to patch)
• Systems running TRCore DVC exposed to network access
• Web servers hosting vulnerable TRCore DVC installations

Discovery Timeline

• 2024-11-18 - CVE-2024-11314 published to NVD
• 2024-11-20 - Last updated in NVD database

Technical Details for CVE-2024-11314

Vulnerability Analysis

This vulnerability presents a severe security risk due to the combination of two distinct weaknesses. The Path Traversal component allows attackers to navigate outside intended directories using specially crafted path sequences (such as ../), while the unrestricted file upload flaw permits the uploading of any file type, including executable scripts and webshells. Together, these weaknesses enable a complete compromise of the affected system.

The attack requires no authentication, making it particularly dangerous for internet-exposed TRCore DVC installations. Once a webshell is successfully uploaded to a web-accessible directory, attackers gain the ability to execute arbitrary commands on the underlying server with the privileges of the web application.

Root Cause

The root cause of CVE-2024-11314 lies in two implementation failures within the TRCore DVC application:

1. Insufficient Path Validation: The application fails to properly sanitize user-supplied path input, allowing directory traversal sequences to escape the intended upload directory.

2. Missing File Type Restrictions: The file upload functionality does not enforce restrictions on uploaded file types, permitting the upload of executable files such as PHP, ASP, or JSP webshells.

These weaknesses indicate a lack of input validation controls and security-by-design principles in the file handling components of the application.

Attack Vector

The attack is network-based and requires no privileges or user interaction. An attacker can exploit this vulnerability by crafting a malicious HTTP request that:

1. Includes path traversal sequences in the file path parameter to specify an arbitrary destination directory
2. Uploads a webshell or other malicious executable file
3. Accesses the uploaded webshell through a web browser to execute commands

The vulnerability manifests in the file upload handling mechanism where user-supplied path parameters are not properly validated before file write operations. Attackers can leverage directory traversal sequences to write files outside the intended upload directory. For detailed technical information, refer to the Taiwan CERT Security Advisory.

Detection Methods for CVE-2024-11314

Indicators of Compromise

• Unexpected file uploads in web-accessible directories, particularly files with executable extensions (.php, .asp, .aspx, .jsp)
• HTTP requests containing path traversal sequences (../, ..\\, %2e%2e%2f) targeting upload endpoints
• Newly created webshell files in non-standard locations on the web server
• Anomalous outbound network connections from web server processes

Detection Strategies

• Monitor HTTP request logs for path traversal patterns in file upload requests
• Implement file integrity monitoring on web server directories to detect unauthorized file creation
• Deploy web application firewalls (WAF) with rules to block path traversal attempts
• Analyze server access logs for requests to suspicious file names or unexpected executable extensions

Monitoring Recommendations

• Enable detailed logging on TRCore DVC file upload functionality
• Configure alerting for file creation events in web-accessible directories
• Monitor process execution from web server user accounts for suspicious command patterns
• Implement network traffic analysis to detect webshell command-and-control communications

How to Mitigate CVE-2024-11314

Immediate Actions Required

• Restrict network access to TRCore DVC installations using firewall rules or network segmentation
• Review web server directories for unauthorized or suspicious files, particularly webshells
• Implement web application firewall rules to block path traversal sequences in requests
• Consider taking vulnerable systems offline until patches can be applied

Patch Information

Organizations running TRCore DVC should consult the vendor for available security patches addressing this vulnerability. Refer to the Taiwan CERT Security Advisory and the Taiwan CERT Incident Report for the latest remediation guidance and patch availability.

Workarounds

• Implement strict network segmentation to limit access to TRCore DVC to trusted networks only
• Deploy a reverse proxy or WAF with rules to filter path traversal sequences and restrict uploadable file types
• Configure file system permissions to prevent the web application from writing to web-accessible directories
• Disable or restrict the file upload functionality if not required for business operations

# Example: Block path traversal patterns at the web server level (Apache mod_rewrite)
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.\\) [NC,OR]
RewriteCond %{REQUEST_URI} (\.\./|\.\.\\) [NC]
RewriteRule .* - [F,L]

# Example: Restrict access to TRCore DVC by IP (Apache)
<Directory "/path/to/dvc">
    Require ip 10.0.0.0/8
    Require ip 192.168.0.0/16
</Directory>