CVE-2024-0417: Csdeshang DSShop Path Traversal Flaw

CVE-2024-0417 Overview

A critical path traversal vulnerability has been identified in DeShang DSShop, an e-commerce platform. The vulnerability exists in the file application/home/controller/MemberAuth.php where improper handling of the member_info argument allows attackers to traverse directories using '../filedir' sequences. This flaw enables unauthorized access to files and directories outside the intended scope, potentially leading to sensitive data exposure, configuration file access, and further system compromise.

Critical Impact

This path traversal vulnerability allows remote attackers to access arbitrary files on the server without authentication, potentially exposing sensitive configuration files, user data, and enabling further exploitation of the affected system.

Affected Products

• DeShang DSShop versions up to and including 2.1.5
• csdeshang dsshop (all versions prior to patch)

Discovery Timeline

• 2024-01-11 - CVE-2024-0417 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2024-0417

Vulnerability Analysis

This vulnerability is classified as CWE-24 (Path Traversal: '../filedir'), a specific subset of path traversal attacks. The vulnerable component resides in the MemberAuth.php controller within the application's home module. When processing user-supplied input through the member_info parameter, the application fails to properly sanitize directory traversal sequences.

The vulnerability allows attackers to break out of the intended directory structure by injecting relative path components such as ../ into the input. This enables navigation to parent directories and ultimately access to sensitive files anywhere on the filesystem that the web server process has permission to read.

The attack can be initiated remotely over the network without requiring any authentication or user interaction, making it highly exploitable. Successful exploitation could lead to unauthorized access to sensitive configuration files, database credentials, source code, and other critical system resources.

Root Cause

The root cause of this vulnerability is insufficient input validation and sanitization in the MemberAuth.php controller. The application does not properly filter or reject directory traversal sequences (such as ../) in the member_info parameter before using it to construct file paths. This allows an attacker to manipulate the path and escape the intended directory boundary.

Attack Vector

The attack is conducted remotely over the network by sending crafted HTTP requests to the vulnerable endpoint. An attacker manipulates the member_info parameter to include path traversal sequences, allowing them to navigate the file system and access arbitrary files.

The exploit has been publicly disclosed, increasing the risk of exploitation in the wild. Attackers can leverage this vulnerability to:

1. Read sensitive configuration files containing database credentials
2. Access application source code for further vulnerability discovery
3. Retrieve user data and session information
4. Gather system information for privilege escalation attacks

Technical details and proof-of-concept information are available through VulDB #250437 and Zhao Jin's technical notes.

Detection Methods for CVE-2024-0417

Indicators of Compromise

• HTTP requests containing ../ sequences targeting MemberAuth.php endpoints
• Unusual access patterns to the application/home/controller/MemberAuth.php file
• Web server logs showing repeated requests with encoded path traversal sequences such as %2e%2e%2f or ..%2f
• Access attempts to sensitive files like /etc/passwd, configuration files, or database credentials through the application

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block path traversal patterns in the member_info parameter
• Configure intrusion detection systems (IDS/IPS) with signatures for path traversal attack patterns
• Monitor application logs for suspicious requests containing directory traversal sequences
• Deploy SentinelOne Singularity Platform for real-time detection of file access anomalies and exploitation attempts

Monitoring Recommendations

• Enable detailed logging on web servers to capture full request parameters
• Set up alerts for any access attempts to files outside the web application root directory
• Monitor for unusual file read operations by the web server process
• Implement file integrity monitoring on critical system and configuration files

How to Mitigate CVE-2024-0417

Immediate Actions Required

• Upgrade DeShang DSShop to a patched version if available from the vendor
• Implement input validation to reject any path traversal sequences in the member_info parameter
• Deploy Web Application Firewall (WAF) rules to block requests containing ../ or encoded variants
• Restrict file system permissions for the web server process to minimize impact

Patch Information

No official patch information has been published by the vendor at this time. Organizations should monitor the official DeShang DSShop channels and VulDB for updates on security patches.

In the absence of an official patch, organizations should implement the workarounds below and consider additional compensating controls to protect vulnerable systems.

Workarounds

• Implement strict input validation that rejects any path traversal sequences including ../, ..\\, URL-encoded variants, and double-encoded variants
• Use a whitelist approach for the member_info parameter, allowing only expected characters and patterns
• Configure the web server to operate with minimal file system permissions using the principle of least privilege
• Deploy a reverse proxy or WAF in front of the application to filter malicious requests
• Consider temporarily disabling the affected functionality in MemberAuth.php until a patch is available

# Example Apache ModSecurity rule to block path traversal attempts
SecRule REQUEST_URI|ARGS|ARGS_NAMES "@contains ../" \
    "id:1001,\
    phase:2,\
    deny,\
    status:403,\
    log,\
    msg:'Path Traversal Attack Detected - CVE-2024-0417',\
    severity:'CRITICAL'"