CVE-2024-34470
📋 TL;DR
An unauthenticated path traversal vulnerability in HSC Mailinspector allows attackers to read arbitrary files on the server without authentication. This affects HSC Mailinspector versions 5.2.17-3 through 5.2.18. Attackers can exploit this to access sensitive system files, configuration files, or other data.
💻 Affected Systems
- HSC Mailinspector
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers read sensitive files like /etc/passwd, /etc/shadow, configuration files with credentials, or source code, leading to full system compromise.
Likely Case
Attackers exfiltrate configuration files, user data, or other sensitive information from the server.
If Mitigated
Limited impact if file permissions restrict access to sensitive files or if the server is isolated.
🎯 Exploit Status
Exploitation is straightforward with publicly available proof-of-concept code targeting the path parameter.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
Check vendor for updates; if unavailable, apply workarounds or upgrade to a non-vulnerable version.
🔧 Temporary Workarounds
Block access to /public/loader.php
allRestrict access to the vulnerable endpoint using web server configuration or firewall rules.
# Apache: <Location "/public/loader.php"> Require all denied </Location>
# Nginx: location /public/loader.php { deny all; }
Implement input validation
allAdd server-side validation to filter path parameter inputs and restrict to webroot.
🧯 If You Can't Patch
- Restrict network access to the server to trusted IPs only.
- Monitor logs for suspicious access to /public/loader.php with unusual path parameters.
🔍 How to Verify
Check if Vulnerable:
Test by accessing /public/loader.php?path=../../../etc/passwd and checking for file content in response.Check Version:
Check HSC Mailinspector version in admin interface or configuration files.Verify Fix Applied:
Verify the endpoint is blocked or returns an error when attempting path traversal.📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /public/loader.php with path parameter containing ../ sequences.
- Unusual file access patterns from external IPs.
Network Indicators:
- Traffic to /public/loader.php with suspicious query strings.
SIEM Query:
source="web_logs" AND uri_path="/public/loader.php" AND query="*../*"