CVE-2024-20410
📋 TL;DR
An unauthenticated cross-site scripting (XSS) vulnerability in Cisco Firepower Management Center's web interface allows remote attackers to inject malicious scripts. This could lead to session hijacking, credential theft, or unauthorized actions when administrators view compromised pages. Organizations using vulnerable FMC versions are affected.
💻 Affected Systems
- Cisco Firepower Management Center (FMC)
📦 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
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
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
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
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
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
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
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
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
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
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
Attacker gains administrative access to FMC, modifies firewall rules, exfiltrates sensitive network data, or deploys malware across managed security devices.
Likely Case
Attacker steals administrator session cookies or credentials, leading to unauthorized access to the management interface.
If Mitigated
With proper network segmentation and access controls, impact is limited to the management interface without compromising core network security functions.
🎯 Exploit Status
XSS vulnerabilities are commonly exploited and require minimal technical skill. No authentication required for initial injection.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.4.1.3 and later
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-xss-dhJxQYZs
Restart Required: Yes
Instructions:
1. Backup FMC configuration. 2. Download and install FMC software version 7.4.1.3 or later from Cisco Software Center. 3. Reboot the FMC appliance after installation completes.
🔧 Temporary Workarounds
Restrict Management Interface Access
allLimit access to FMC web interface to trusted IP addresses only using network ACLs or firewall rules.
Enable Content Security Policy Headers
allConfigure web server to send Content-Security-Policy headers that restrict script execution sources.
🧯 If You Can't Patch
- Isolate FMC management interface to dedicated VLAN with strict access controls
- Implement web application firewall (WAF) with XSS protection rules in front of FMC
🔍 How to Verify
Check if Vulnerable:
Check FMC software version via web interface: System > Updates > Version InformationCheck Version:
ssh admin@fmc-host 'show version' or check web interfaceVerify Fix Applied:
Confirm version is 7.4.1.3 or later and test input validation on web interface forms📡 Detection & Monitoring
Log Indicators:
- Unusual JavaScript payloads in web server logs
- Multiple failed login attempts following suspicious web requests
Network Indicators:
- HTTP requests with encoded script tags or JavaScript payloads to FMC management interface
SIEM Query:
source="fmc-web.log" AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=")