CVE-2021-30642
📋 TL;DR
This critical vulnerability allows remote, unauthenticated attackers to execute arbitrary operating system commands with elevated privileges on Symantec Security Analytics web UI. Affected systems include versions 7.2 prior to 7.2.7, 8.1 prior to 8.1.3-NSR3, 8.2 prior to 8.2.1-NSR2, and 8.2.2. The flaw stems from improper input validation in the web interface.
💻 Affected Systems
- Symantec Security Analytics
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to install malware, exfiltrate sensitive data, pivot to other systems, and maintain persistent access.
Likely Case
Attackers gain full control of the Security Analytics appliance, potentially accessing network monitoring data and using it as a foothold for lateral movement.
If Mitigated
Limited impact if system is isolated, patched, or has network controls preventing external access.
🎯 Exploit Status
The CVSS 9.8 score and unauthenticated nature make this highly attractive for exploitation. While no public PoC is confirmed, similar command injection vulnerabilities are often weaponized quickly.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.2.7, 8.1.3-NSR3, 8.2.1-NSR2, or later versions
Vendor Advisory: https://support.broadcom.com/security-advisory/content/security-advisories/0/SYMSA17969
Restart Required: Yes
Instructions:
1. Download appropriate patch from Broadcom support portal. 2. Backup current configuration. 3. Apply patch following vendor instructions. 4. Restart the Security Analytics appliance. 5. Verify patch installation and system functionality.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to Security Analytics web UI to trusted management networks only
Configure firewall rules to allow access only from specific IP ranges
Disable Web UI
linuxTemporarily disable the web interface if not required for operations
Consult vendor documentation for disabling web UI service
🧯 If You Can't Patch
- Immediately isolate the Security Analytics appliance from internet and untrusted networks
- Implement strict network access controls allowing only necessary management traffic from trusted sources
🔍 How to Verify
Check if Vulnerable:
Check current version via web UI admin panel or SSH to appliance and check version filesCheck Version:
ssh admin@[appliance-ip] 'cat /etc/version' or check via web UI admin interfaceVerify Fix Applied:
Verify installed version matches patched versions (7.2.7, 8.1.3-NSR3, 8.2.1-NSR2 or later)📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Web UI access from unexpected sources
- Failed authentication attempts followed by successful command execution
Network Indicators:
- Unexpected outbound connections from Security Analytics appliance
- Traffic patterns suggesting command and control activity
SIEM Query:
source="security_analytics" AND (event_type="command_execution" OR http_uri CONTAINS "cmd" OR http_uri CONTAINS "exec")