CVE-2021-26725
📋 TL;DR
This path traversal vulnerability in Nozomi Networks Guardian and CMC allows authenticated administrators to read protected system files through the web GUI's timezone change function. It affects Guardian and CMC versions 20.0.7.3 and earlier. Exploitation requires administrator credentials but enables unauthorized file access.
💻 Affected Systems
- Nozomi Networks Guardian
- Nozomi Networks CMC
📦 What is this software?
Guardian by Nozominetworks
Guardian by Nozominetworks
⚠️ Risk & Real-World Impact
Worst Case
Administrator credentials are compromised, allowing attackers to read sensitive system files, potentially exposing configuration secrets, credentials, or other protected data.
Likely Case
Malicious insider or compromised administrator account reads sensitive system files containing configuration data or credentials.
If Mitigated
With proper access controls and monitoring, impact is limited to authorized administrators who should already have access to most system files.
🎯 Exploit Status
Exploitation requires administrator credentials but path traversal techniques are well-understood.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 20.0.7.3
Vendor Advisory: https://security.nozominetworks.com/NN-2021:2-01
Restart Required: Yes
Instructions:
1. Upgrade to version after 20.0.7.3. 2. Follow Nozomi Networks upgrade documentation. 3. Restart affected services.
🔧 Temporary Workarounds
Restrict Administrator Access
allLimit administrator accounts to trusted personnel only and implement strong authentication controls.
Network Segmentation
allIsolate Nozomi Networks devices from general network access, limiting exposure to potential attackers.
🧯 If You Can't Patch
- Implement strict access controls on administrator accounts with multi-factor authentication.
- Monitor administrator activity logs for unusual file access patterns through the web GUI.
🔍 How to Verify
Check if Vulnerable:
Check version in web GUI or via CLI: version should be 20.0.7.3 or earlier.Check Version:
Check web GUI dashboard or consult Nozomi Networks documentation for version check commands.Verify Fix Applied:
Verify version is updated to later than 20.0.7.3 and test timezone change functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual file access patterns via web GUI
- Multiple timezone change attempts
- Access to protected system file paths
Network Indicators:
- HTTP requests to timezone change endpoint with path traversal patterns
SIEM Query:
web_gui_access AND (path_traversal_patterns OR unusual_file_access)