CVE-2023-20048
📋 TL;DR
This vulnerability allows authenticated remote attackers to execute unauthorized configuration commands on Firepower Threat Defense devices managed by Cisco Firepower Management Center. Attackers need valid FMC credentials to exploit insufficient authorization checks in the web services interface. Organizations using affected Cisco FMC software versions are at risk.
💻 Affected Systems
- Cisco Firepower Management Center
📦 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
Secure Firewall Management Center by Cisco
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of FTD devices allowing network reconfiguration, traffic interception, lateral movement, and persistent backdoor installation.
Likely Case
Unauthorized configuration changes to firewall rules, network policies, or device settings leading to security bypass or service disruption.
If Mitigated
Limited impact due to strong credential management, network segmentation, and monitoring preventing successful exploitation.
🎯 Exploit Status
Exploitation requires valid credentials but is straightforward once authenticated. No public exploit code known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.2.5, 7.4.1 or later
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-cmd-inj-29MP49hN
Restart Required: Yes
Instructions:
1. Backup FMC configuration. 2. Download and install FMC software update 7.2.5 or 7.4.1 from Cisco. 3. Restart FMC appliance. 4. Verify FTD devices reconnect properly.
🔧 Temporary Workarounds
Restrict FMC web interface access
allLimit access to FMC web services interface to trusted IP addresses only
Configure firewall rules to restrict access to FMC management IP/ports
Enforce strong authentication
allImplement multi-factor authentication and strong password policies for FMC accounts
Enable MFA in FMC settings
Enforce complex password requirements
🧯 If You Can't Patch
- Implement strict network segmentation to isolate FMC management network
- Enable detailed logging and monitoring of all configuration changes on FTD devices
🔍 How to Verify
Check if Vulnerable:
Check FMC software version via web interface: System > Updates > Version InformationCheck Version:
ssh admin@fmc-ip 'show version' or check web interfaceVerify Fix Applied:
Verify version is 7.2.5, 7.4.1 or later and test configuration command authorization📡 Detection & Monitoring
Log Indicators:
- Unauthorized configuration commands in FMC logs
- Failed authorization attempts for configuration changes
- Unusual configuration changes from non-admin accounts
Network Indicators:
- HTTP POST requests to FMC web services interface with configuration payloads
- Unusual traffic patterns from FMC to FTD devices
SIEM Query:
source="fmc.log" AND ("configuration command" OR "unauthorized access") AND severity>=WARNING