CVE-2025-40893
📋 TL;DR
An unauthenticated attacker can inject HTML into asset attributes by sending crafted network packets to the Asset List functionality. When users view affected assets, the injected HTML renders in their browsers, enabling phishing and open redirect attacks. This affects systems using the vulnerable Asset List functionality.
💻 Affected Systems
- Nozomi Networks Guardian/CMC products with Asset List functionality
📦 What is this software?
Cmc by Nozominetworks
Guardian by Nozominetworks
⚠️ Risk & Real-World Impact
Worst Case
Successful phishing campaigns leading to credential theft or open redirect attacks that could redirect users to malicious sites.
Likely Case
Limited phishing attempts or defacement of asset information pages through HTML injection.
If Mitigated
Minimal impact due to existing input validation and Content Security Policy preventing full XSS and information disclosure.
🎯 Exploit Status
Exploitation requires sending specially crafted network packets to the vulnerable functionality
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in reference, but vendor has released fixes
Vendor Advisory: https://security.nozominetworks.com/NN-2025:14-01
Restart Required: Yes
Instructions:
1. Review vendor advisory at provided URL
2. Apply the latest security updates from Nozomi Networks
3. Restart affected services after patching
4. Verify the fix by testing asset list functionality
🔧 Temporary Workarounds
Network Access Restriction
allRestrict network access to the Asset List functionality to trusted sources only
Configure firewall rules to limit access to the vulnerable service ports
Input Validation Enhancement
allImplement additional input validation for network traffic data processing
Review and enhance input validation routines in asset processing code
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable systems
- Deploy web application firewall (WAF) with HTML injection protection rules
🔍 How to Verify
Check if Vulnerable:
Test if HTML can be injected into asset attributes via network traffic dataCheck Version:
Check product version via Nozomi Networks administrative interface or CLIVerify Fix Applied:
Attempt HTML injection after patching to confirm it's blocked📡 Detection & Monitoring
Log Indicators:
- Unusual network traffic patterns to asset list endpoints
- HTML tags in asset attribute fields
Network Indicators:
- Crafted packets containing HTML tags sent to asset list functionality
SIEM Query:
source_ip=* AND dest_port=[asset_list_port] AND payload CONTAINS '<script>' OR '<iframe>' OR 'javascript:'