CVE-2020-5754
📋 TL;DR
CVE-2020-5754 is a type confusion vulnerability in Webroot endpoint agents that allows remote attackers to crash the agent or read its memory contents by sending specially crafted TCP packets to its listening port. This affects organizations using Webroot endpoint protection with vulnerable agent versions. Attackers can potentially gain unauthorized access to sensitive memory data.
💻 Affected Systems
- Webroot Endpoint Protection
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data exfiltration, or lateral movement within the network.
Likely Case
Denial of service through agent crashes and potential memory disclosure that could reveal sensitive information or facilitate further attacks.
If Mitigated
Limited impact with proper network segmentation and updated agents, potentially only causing temporary service disruption.
🎯 Exploit Status
Tenable published detailed research including proof-of-concept code. Exploitation requires network access to the agent's TCP port (default 27015).
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v9.0.28.48 and later
Vendor Advisory: https://community.webroot.com/announcements-3/webroot-endpoint-agent-vulnerability-cve-2020-5754-316667
Restart Required: Yes
Instructions:
1. Update Webroot Management Console to latest version. 2. Deploy agent update to all endpoints. 3. Restart endpoints to ensure new agent version is active. 4. Verify agent version is v9.0.28.48 or higher.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to Webroot agent TCP port (default 27015) using firewall rules
Windows: netsh advfirewall firewall add rule name="Block Webroot Port" dir=in action=block protocol=TCP localport=27015
Linux: iptables -A INPUT -p tcp --dport 27015 -j DROP
Disable Remote Management
allConfigure Webroot agent to disable remote management features if not required
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Webroot agents from untrusted networks
- Monitor for unusual network traffic to Webroot agent ports and agent crash events
🔍 How to Verify
Check if Vulnerable:
Check Webroot agent version in system tray or via Webroot Management Console. Versions below v9.0.28.48 are vulnerable.Check Version:
Windows: Check Webroot system tray icon or C:\ProgramData\WRData\wrlog.txt. macOS: Check /Library/Application Support/Webroot/wrlog.txtVerify Fix Applied:
Confirm agent version is v9.0.28.48 or higher in Webroot Management Console or local agent interface.📡 Detection & Monitoring
Log Indicators:
- Webroot agent crash logs
- Unexpected termination of wrservice.exe (Windows) or WebrootService (macOS)
- Memory access violations in system logs
Network Indicators:
- Unusual TCP traffic to port 27015
- Multiple connection attempts to Webroot agent port from single source
- Malformed packets to Webroot port
SIEM Query:
source="webroot" AND (event="crash" OR event="terminated") OR destination_port=27015 AND protocol=TCP AND bytes_sent>1000