CVE-2024-0416: Csdeshang Dsmall Path Traversal Flaw

CVE-2024-0416 Overview

A critical path traversal vulnerability has been discovered in DeShang DSMall, a popular e-commerce platform. The vulnerability exists in the file application/home/controller/MemberAuth.php where improper handling of the file_name argument allows attackers to traverse directory structures using ../ sequences. This flaw enables unauthorized access to sensitive files outside the intended directory, potentially leading to information disclosure, configuration exposure, or further system compromise.

Critical Impact

Remote attackers can exploit this path traversal vulnerability without authentication to access arbitrary files on the server, potentially exposing sensitive configuration data, user credentials, or application source code.

Affected Products

• DeShang DSMall versions up to and including 5.0.3
• csdeshang dsmall e-commerce platform

Discovery Timeline

• 2024-01-11 - CVE-2024-0416 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2024-0416

Vulnerability Analysis

This path traversal vulnerability (CWE-24) affects the MemberAuth.php controller in the DSMall application. The vulnerable code fails to properly sanitize user-supplied input in the file_name parameter, allowing attackers to inject directory traversal sequences (../) to escape the intended file directory. This enables access to files outside the web application's root directory structure.

The vulnerability is remotely exploitable without requiring authentication or user interaction, making it particularly dangerous for internet-facing DSMall installations. An attacker can potentially read sensitive configuration files, database credentials, or other critical system files that should not be publicly accessible.

Root Cause

The root cause of this vulnerability is insufficient input validation and sanitization of the file_name parameter in the MemberAuth.php controller. The application fails to implement proper path canonicalization or restrict file access to a designated safe directory. User-controlled input is directly used in file path operations without stripping or encoding directory traversal characters, allowing attackers to break out of the intended directory structure.

Attack Vector

The attack can be launched remotely over the network against vulnerable DSMall installations. An attacker crafts a malicious HTTP request containing directory traversal sequences in the file_name parameter. By manipulating this parameter with sequences like ../../../etc/passwd or similar paths, the attacker can traverse up the directory tree and access files outside the application's intended scope.

The exploit has been publicly disclosed, which increases the risk of exploitation in the wild. The attack requires no authentication and no user interaction, making it trivially exploitable against unpatched systems.

Detection Methods for CVE-2024-0416

Indicators of Compromise

• HTTP requests to MemberAuth.php containing ../ sequences in the file_name parameter
• Unusual file access patterns in web server logs showing attempts to read system files
• Access log entries showing requests for sensitive files like /etc/passwd, configuration files, or .env files
• Error logs indicating failed file access attempts outside the web root directory

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block path traversal patterns (../, ..%2f, ..%252f)
• Configure intrusion detection systems to alert on anomalous file access requests targeting sensitive system paths
• Deploy file integrity monitoring on critical system and configuration files
• Enable detailed logging on the web server to capture all requests to the vulnerable endpoint

Monitoring Recommendations

• Monitor web server access logs for requests containing path traversal sequences targeting MemberAuth.php
• Set up alerts for any access attempts to sensitive system files from web application processes
• Implement real-time log analysis to detect exploitation patterns
• Review SentinelOne endpoint detection alerts for suspicious file access activity originating from web server processes

How to Mitigate CVE-2024-0416

Immediate Actions Required

• Upgrade DeShang DSMall to a patched version beyond 5.0.3 if available from the vendor
• Implement input validation to strip or reject path traversal sequences from user input
• Configure web application firewall rules to block requests containing ../ patterns
• Restrict file system permissions to limit web server access to only necessary directories

Patch Information

At the time of this advisory, no official vendor patch has been publicly documented in the available references. Organizations should contact DeShang directly for patch availability or upgrade guidance. In the meantime, implement the recommended workarounds to reduce exposure.

For more technical details, refer to the VulDB advisory or the technical disclosure.

Workarounds

• Deploy a web application firewall with rules to detect and block path traversal attempts
• Implement server-side input validation to sanitize the file_name parameter before use
• Apply PHP basename() function to strip directory components from file name inputs
• Consider restricting access to the vulnerable endpoint via IP allowlisting or authentication requirements until patched

# Example: Apache mod_rewrite rule to block path traversal attempts
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./) [NC,OR]
RewriteCond %{REQUEST_URI} (\.\./) [NC]
RewriteRule .* - [F,L]