CVE-2017-17992
📋 TL;DR
This vulnerability in Biometric Shift Employee Management System allows attackers to download arbitrary files from the server using directory traversal sequences. Attackers can access sensitive system files, configuration files, or database credentials by manipulating the form_file_name parameter. This affects all installations of the vulnerable software version.
💻 Affected Systems
- Biometric Shift Employee Management System
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through theft of sensitive files like configuration files, database credentials, or system files leading to full administrative access.
Likely Case
Data breach exposing sensitive employee information, system configuration details, or authentication credentials stored in accessible files.
If Mitigated
Limited impact with proper file system permissions and web server restrictions preventing access to critical system files.
🎯 Exploit Status
Exploitation requires only web access and knowledge of the vulnerable endpoint with directory traversal payloads.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Consider implementing workarounds or replacing the software.
🔧 Temporary Workarounds
Input Validation Filter
allAdd input validation to filter directory traversal sequences in the form_file_name parameter
Modify index.php to sanitize form_file_name parameter before processing
Web Server Restrictions
allConfigure web server to restrict file access to specific directories only
Apache: Use Directory directives with AllowOverride None
Nginx: Use location blocks with root restrictions
🧯 If You Can't Patch
- Implement network segmentation to isolate the system from sensitive networks
- Deploy a web application firewall (WAF) with directory traversal protection rules
🔍 How to Verify
Check if Vulnerable:
Test by accessing the vulnerable endpoint with directory traversal payloads like ../../../etc/passwd in form_file_name parameterCheck Version:
Check software version in admin panel or configuration files if accessibleVerify Fix Applied:
Attempt exploitation with the same payloads after implementing fixes to confirm they are blocked📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing ../ sequences in URL parameters
- Unusual file access patterns from web application logs
Network Indicators:
- HTTP requests with directory traversal patterns in parameters
- Multiple failed attempts to access system files
SIEM Query:
web.url:*../* AND (web.url_param:*form_file_name* OR web.uri:*download_form*)