CVE-2023-48383
📋 TL;DR
CVE-2023-48383 is a path traversal vulnerability in NetVision airPASS that allows unauthenticated remote attackers to bypass authentication and download arbitrary system files. This affects systems running vulnerable versions of NetVision airPASS software. Attackers can access sensitive files without valid credentials.
💻 Affected Systems
- NetVision airPASS
📦 What is this software?
Airpass by Netvision
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through sensitive file disclosure (passwords, configuration files, SSH keys), leading to lateral movement and data exfiltration.
Likely Case
Unauthorized access to sensitive system files, configuration data, and potentially authentication credentials stored on the server.
If Mitigated
Limited impact with proper network segmentation, file system permissions, and monitoring in place.
🎯 Exploit Status
Path traversal vulnerabilities typically have low exploitation complexity; unauthenticated access makes this particularly dangerous
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in provided references
Vendor Advisory: https://www.twcert.org.tw/tw/cp-132-7631-c6be3-1.html
Restart Required: Yes
Instructions:
1. Contact NetVision for patch information 2. Apply vendor-provided security updates 3. Restart affected services 4. Verify patch application
🔧 Temporary Workarounds
Input Validation Filter
allImplement strict input validation to block path traversal sequences in URL parameters
# Web server configuration depends on specific deployment
# Example for Apache: RewriteRule ^.*\.\./.*$ - [F,L]
# Example for Nginx: if ($request_uri ~* "\.\.") { return 403; }
Network Access Control
linuxRestrict access to vulnerable endpoints using firewall rules
# Example iptables rule to restrict access
iptables -A INPUT -p tcp --dport [airPASS_PORT] -s [TRUSTED_NETWORK] -j ACCEPT
iptables -A INPUT -p tcp --dport [airPASS_PORT] -j DROP
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block path traversal patterns
- Remove internet-facing exposure and place behind VPN with strict access controls
🔍 How to Verify
Check if Vulnerable:
Test for path traversal by attempting to access files like ../../etc/passwd through the vulnerable parameterCheck Version:
Check NetVision airPASS version through admin interface or configuration filesVerify Fix Applied:
Attempt exploitation after patch application; successful requests should return access denied or proper error messages📡 Detection & Monitoring
Log Indicators:
- Multiple failed attempts to access system files
- Requests containing ../ patterns in URL parameters
- Unusual file access patterns from single IP
Network Indicators:
- HTTP requests with ../ sequences in parameters
- Unusual file downloads from airPASS endpoints
SIEM Query:
source="airPASS_logs" AND (uri="*../*" OR status=200 AND uri="*/etc/*" OR uri="*/windows/*")