CVE-2023-20219
📋 TL;DR
This vulnerability allows authenticated remote attackers with valid device credentials (no admin privileges required) to execute arbitrary commands on Cisco Firepower Management Center (FMC) systems. The attack exploits insufficient input validation in the web management interface configuration options, potentially compromising the underlying operating system. Organizations using vulnerable Cisco FMC software versions are affected.
💻 Affected Systems
- Cisco Firepower Management Center (FMC) Software
📦 What is this software?
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attacker to execute arbitrary commands on the underlying OS, potentially gaining persistent access, exfiltrating sensitive data, disrupting network security operations, and using the device as a pivot point for further attacks.
Likely Case
Attacker with valid credentials executes commands to modify configurations, disable security controls, create backdoors, or disrupt FMC operations while maintaining access for future exploitation.
If Mitigated
Limited impact due to strong credential management, network segmentation, and monitoring preventing successful exploitation or containing damage if exploitation occurs.
🎯 Exploit Status
Exploitation requires authenticated access but no special privileges. Crafted input via configuration GUI can trigger command injection.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.2.5.1, 7.4.1, and 7.6.0 or later
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-cmdinj-bTEgufOX
Restart Required: Yes
Instructions:
1. Backup current configuration. 2. Download appropriate patch from Cisco Software Center. 3. Apply patch following Cisco upgrade procedures. 4. Verify successful update and functionality.
🔧 Temporary Workarounds
Restrict Web Interface Access
allLimit access to FMC web management interface to trusted IP addresses only
Configure firewall/ACL rules to restrict access to FMC management IP/ports
Enforce Strong Credential Policies
allImplement multi-factor authentication and strong password policies for all FMC accounts
Enable MFA via Cisco Identity Services Engine or similar
Enforce complex passwords with regular rotation
🧯 If You Can't Patch
- Implement strict network segmentation to isolate FMC systems from untrusted networks
- Enable comprehensive logging and monitoring for suspicious configuration changes or command execution attempts
🔍 How to Verify
Check if Vulnerable:
Check FMC version via web interface (System > Updates > Version) or CLI command 'show version'Check Version:
show version | include VersionVerify Fix Applied:
Verify version is 7.2.5.1, 7.4.1, 7.6.0 or later and test configuration functionality📡 Detection & Monitoring
Log Indicators:
- Unusual configuration changes via web interface
- Command execution patterns in system logs
- Multiple failed login attempts followed by successful login
Network Indicators:
- Unusual outbound connections from FMC system
- Traffic patterns suggesting command and control
SIEM Query:
source="fmc_logs" AND (event_type="configuration_change" AND user!="admin") OR (process_execution AND parent_process="web_interface")