CVE-2020-15371
📋 TL;DR
This vulnerability allows remote code injection and privilege escalation in Brocade Fabric OS. Attackers can execute arbitrary code with elevated privileges on affected switches. Organizations using Brocade Fibre Channel switches with vulnerable Fabric OS versions are affected.
💻 Affected Systems
- Brocade Fibre Channel switches running Fabric OS
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of Fibre Channel SAN infrastructure, allowing attackers to intercept, modify, or disrupt storage traffic, potentially leading to data theft, ransomware deployment, or service disruption.
Likely Case
Unauthorized access to storage network, privilege escalation to administrative control, and potential lateral movement to connected systems.
If Mitigated
Limited impact if network segmentation isolates SAN infrastructure and strict access controls prevent unauthorized connections.
🎯 Exploit Status
CVSS 9.8 indicates critical severity with low attack complexity. No authentication required for exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v9.0.0, v8.2.2c, v8.2.1e, v8.1.2k, or v8.2.0_CBN3
Vendor Advisory: https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2020-1080
Restart Required: Yes
Instructions:
1. Download appropriate firmware from Broadcom support portal. 2. Backup switch configuration. 3. Apply firmware update following vendor documentation. 4. Reboot switch. 5. Verify firmware version.
🔧 Temporary Workarounds
Network segmentation
allIsolate SAN infrastructure from general network traffic
Access control restrictions
allRestrict management interface access to authorized IP addresses only
ipaccesscreate -n <name> -i <ip> -m <mask> -p permit
ipaccesscreate -n default -i 0.0.0.0 -m 0.0.0.0 -p deny
🧯 If You Can't Patch
- Implement strict network segmentation to isolate SAN infrastructure
- Apply IP-based access controls to limit management interface access
🔍 How to Verify
Check if Vulnerable:
Check Fabric OS version with 'version' command and compare against patched versionsCheck Version:
versionVerify Fix Applied:
Verify firmware version shows v9.0.0, v8.2.2c, v8.2.1e, v8.1.2k, or v8.2.0_CBN3 or higher📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to management interfaces
- Unexpected configuration changes
- Unusual process execution
Network Indicators:
- Unexpected connections to SAN management ports
- Anomalous traffic patterns in SAN
SIEM Query:
source="brocade_switch" AND (event_type="authentication_failure" OR event_type="configuration_change")