CVE-2024-11313: Trcore DVC Path Traversal Vulnerability

CVE-2024-11313 Overview

CVE-2024-11313 is a critical Path Traversal vulnerability in TRCore DVC that allows unauthenticated remote attackers to upload arbitrary files to any directory on the target system. The vulnerability stems from improper path validation combined with a lack of restrictions on uploaded file types, enabling attackers to achieve arbitrary code execution by uploading webshells.

Critical Impact

Unauthenticated remote attackers can exploit this vulnerability to upload malicious webshells to arbitrary directories, leading to complete system compromise through remote code execution.

Affected Products

• TRCore DVC (all versions)

Discovery Timeline

• 2024-11-18 - CVE-2024-11313 published to NVD
• 2024-11-20 - Last updated in NVD database

Technical Details for CVE-2024-11313

Vulnerability Analysis

This vulnerability combines two dangerous weaknesses: Path Traversal (CWE-22/CWE-23) and unrestricted file upload. The TRCore DVC application fails to properly sanitize user-supplied file paths during the upload process, allowing attackers to use directory traversal sequences (such as ../) to escape the intended upload directory. Additionally, the application does not validate or restrict the types of files that can be uploaded.

This combination is particularly dangerous because it allows attackers to place executable files, such as webshells, in web-accessible directories or other sensitive locations on the filesystem. Once a webshell is uploaded, the attacker can execute arbitrary commands on the server with the privileges of the web application.

Root Cause

The root cause of this vulnerability lies in insufficient input validation on file path parameters during the upload process. The application accepts user-controlled path components without properly sanitizing directory traversal sequences. Combined with the absence of file type validation, this allows attackers to bypass intended directory restrictions and upload malicious executable content.

Attack Vector

The attack can be executed remotely over the network without requiring authentication. An attacker crafts a malicious HTTP request containing directory traversal sequences in the file path parameter along with a webshell payload. The vulnerable application processes this request and writes the malicious file to an attacker-specified location. Once the webshell is uploaded to a web-accessible directory, the attacker can access it via HTTP to execute arbitrary commands on the target system.

The attack flow typically involves:

1. Identifying the vulnerable upload endpoint
2. Crafting a request with path traversal sequences (e.g., ../../webroot/shell.php)
3. Including a webshell or other malicious payload as the file content
4. Accessing the uploaded webshell to gain command execution

Detection Methods for CVE-2024-11313

Indicators of Compromise

• Unexpected files appearing in web-accessible directories, particularly script files (.php, .jsp, .asp, .aspx)
• HTTP requests to upload endpoints containing path traversal sequences (../, ..\, %2e%2e%2f)
• Newly created files with suspicious names or content patterns matching known webshell signatures
• Anomalous web requests to files that were not part of the original application deployment

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block requests containing path traversal patterns
• Monitor file integrity of web-accessible directories to detect unauthorized file creation
• Analyze HTTP access logs for requests to upload functionality containing encoded or raw traversal sequences
• Deploy endpoint detection solutions to identify webshell execution behavior

Monitoring Recommendations

• Enable detailed logging on the TRCore DVC application to capture all file upload attempts
• Configure alerts for new file creation events in web server document roots and application directories
• Monitor process execution chains originating from web server processes for anomalous command execution
• Implement network monitoring to detect command and control traffic patterns associated with webshell activity

How to Mitigate CVE-2024-11313

Immediate Actions Required

• Restrict network access to the TRCore DVC application to trusted IP addresses only
• Implement web application firewall rules to block requests containing path traversal sequences
• Review web-accessible directories for any unauthorized or suspicious files and remove them
• Consider temporarily disabling the file upload functionality until a patch is available

Patch Information

Consult the TW-CERT Security Advisory for official guidance from the Taiwan Computer Emergency Response Team. Contact TRCore directly for patch availability and updated software versions that address this vulnerability.

Workarounds

• Deploy a reverse proxy or WAF in front of the application to filter malicious requests containing traversal patterns
• Implement strict allow-listing of permitted file extensions at the web server level
• Configure the web server to prevent execution of scripts in upload directories using appropriate directives
• Apply principle of least privilege to the application's filesystem permissions to limit writable directories

Organizations should prioritize applying vendor-provided patches when available. In the interim, network segmentation and access controls can help reduce the attack surface for this vulnerability.