CVE-2021-4106
📋 TL;DR
CVE-2021-4106 is a privilege escalation vulnerability in Snow Inventory Java Scanner that allows attackers to execute arbitrary code with elevated privileges. This affects organizations using SNOW Snow Inventory Java Scanner version 1.0 for IT asset management. Successful exploitation could lead to complete system compromise.
💻 Affected Systems
- SNOW Snow Inventory Java Scanner
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with administrative privileges, enabling data theft, lateral movement, and persistent backdoor installation across the network.
Likely Case
Local privilege escalation allowing attackers to gain administrative access to the host system and potentially pivot to other systems.
If Mitigated
Limited impact with proper network segmentation, least privilege principles, and monitoring in place.
🎯 Exploit Status
Requires local access or ability to interact with the Java Scanner process. No public exploit code available as of knowledge cutoff.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to latest version as per vendor advisory
Vendor Advisory: https://community.snowsoftware.com/s/feed/0D5690000BObYdUCQV
Restart Required: Yes
Instructions:
1. Check current version of Snow Inventory Java Scanner. 2. Download and apply the latest patch from Snow Software. 3. Restart the Java Scanner service. 4. Verify the update was successful.
🔧 Temporary Workarounds
Disable Java Scanner
allTemporarily disable the vulnerable Java Scanner component if patching is not immediately possible
Stop the Snow Inventory Java Scanner service
Restrict Access
allApply network segmentation and firewall rules to limit access to the Java Scanner
Configure firewall to allow only trusted management systems to communicate with Java Scanner
🧯 If You Can't Patch
- Implement strict network segmentation to isolate systems running the vulnerable scanner
- Apply principle of least privilege and monitor for suspicious privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check the version of Snow Inventory Java Scanner installed; version 1.0 is vulnerableCheck Version:
Check Snow Inventory administration console or consult system documentation for version informationVerify Fix Applied:
Verify the Java Scanner version has been updated to a patched version and test functionality📡 Detection & Monitoring
Log Indicators:
- Unusual Java process spawning with elevated privileges
- Unexpected modifications to Java Scanner files or configuration
Network Indicators:
- Unusual network connections originating from Java Scanner process
SIEM Query:
Process creation events where parent process is Java Scanner and child process has elevated privileges