CVE-2024-20298
📋 TL;DR
This CVE describes a cross-site scripting (XSS) vulnerability in Cisco Firepower Management Center's web interface that allows authenticated attackers to inject malicious scripts. When exploited, it enables attackers to execute arbitrary JavaScript in victims' browsers, potentially stealing session cookies or performing actions as the victim. Only authenticated users with access to the FMC web interface 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
⚠️ Risk & Real-World Impact
Worst Case
Attacker steals administrator session cookies, gains full administrative access to the FMC, and potentially compromises the entire security infrastructure managed by FMC.
Likely Case
Attacker steals session cookies or performs limited actions as the victim user, potentially escalating privileges or accessing sensitive configuration data.
If Mitigated
With proper input validation and output encoding, the attack fails to execute malicious scripts, limiting impact to data display issues.
🎯 Exploit Status
Exploitation requires authenticated access; attacker needs to trick victim into interacting with malicious input.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.4.1 or 7.2.5.2
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-xss-M446vbEO
Restart Required: Yes
Instructions:
1. Backup FMC configuration. 2. Download appropriate patch from Cisco Software Center. 3. Apply patch via FMC web interface or CLI. 4. Reboot system as required.
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement additional input validation on affected data fields
Content Security Policy
allImplement strict CSP headers to limit script execution
🧯 If You Can't Patch
- Restrict access to FMC web interface to trusted networks only
- Implement web application firewall with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Check FMC version via web interface (System > Updates) or CLI command 'show version'Check Version:
show versionVerify Fix Applied:
Verify version is 7.4.1 or 7.2.5.2 or later after patching📡 Detection & Monitoring
Log Indicators:
- Unusual input patterns in web interface logs
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- Unusual outbound connections from FMC to external domains
- Suspicious JavaScript payloads in HTTP requests
SIEM Query:
source="fmc_web_logs" AND (http_uri CONTAINS "<script>" OR http_uri CONTAINS "javascript:")