CVE-2020-8463
📋 TL;DR
This vulnerability in Trend Micro InterScan Web Security Virtual Appliance allows attackers to bypass authorization checks for anonymous users by manipulating request paths. This affects organizations using the vulnerable version of this web security appliance, potentially exposing protected resources to unauthorized access.
💻 Affected Systems
- Trend Micro InterScan Web Security Virtual Appliance
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could gain unauthorized access to sensitive administrative functions or protected web resources, potentially leading to data exfiltration, system compromise, or further privilege escalation.
Likely Case
Unauthorized users accessing restricted areas or resources they shouldn't have permission to view, potentially exposing internal web applications or sensitive information.
If Mitigated
Limited impact with proper network segmentation and additional authentication layers, though the vulnerability still presents a security weakness.
🎯 Exploit Status
The vulnerability involves path manipulation which is relatively straightforward to exploit once the technique is understood.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to version with fix as specified in vendor advisory
Vendor Advisory: https://success.trendmicro.com/solution/000283077
Restart Required: Yes
Instructions:
1. Download the latest patch from Trend Micro support portal. 2. Apply the patch following vendor instructions. 3. Restart the appliance as required. 4. Verify the fix is applied.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to the appliance management interface to trusted networks only
Additional Authentication Layer
allImplement additional authentication mechanisms in front of the appliance
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach the appliance
- Monitor logs for unusual path manipulation attempts and unauthorized access patterns
🔍 How to Verify
Check if Vulnerable:
Check if running Trend Micro InterScan Web Security Virtual Appliance version 6.5 SP2Check Version:
Check appliance web interface or console for version informationVerify Fix Applied:
Verify version has been updated beyond the vulnerable release and test authorization bypass attempts📡 Detection & Monitoring
Log Indicators:
- Unusual path manipulation in request logs
- Access attempts from anonymous users to restricted paths
- Failed authorization checks followed by successful access
Network Indicators:
- Unusual HTTP request patterns with manipulated paths
- Access to administrative interfaces from unauthorized sources
SIEM Query:
source="interscan" AND (path:*../* OR path:*..\* OR path:*%2e%2e%2f*) AND response_code=200🔗 References
- https://sec-consult.com/vulnerability-lab/advisory/multiple-critical-vulnerabilities-in-trend-micro-interscan-web-security-virtual-appliance/
- https://success.trendmicro.com/solution/000283077
- https://sec-consult.com/vulnerability-lab/advisory/multiple-critical-vulnerabilities-in-trend-micro-interscan-web-security-virtual-appliance/
- https://success.trendmicro.com/solution/000283077
