CVE-2024-20431
📋 TL;DR
This vulnerability in Cisco Firepower Threat Defense (FTD) Software allows unauthenticated remote attackers to bypass geolocation-based access control policies by sending traffic through affected devices. Organizations using FTD with geolocation access control features are affected. The vulnerability stems from improper assignment of geolocation data.
💻 Affected Systems
- Cisco Firepower Threat Defense (FTD) Software
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could bypass all geolocation-based access controls, potentially allowing unauthorized access to protected internal resources from blocked geographic regions.
Likely Case
Attackers bypass specific geolocation restrictions, potentially accessing services intended only for certain geographic regions.
If Mitigated
With proper network segmentation and additional authentication layers, impact is limited to bypassing only the geolocation control component.
🎯 Exploit Status
Exploitation requires sending traffic through affected devices. No authentication required for exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.4.1 and later
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-geoip-bypass-MB4zRDu
Restart Required: Yes
Instructions:
1. Review Cisco advisory for specific affected versions. 2. Upgrade to FTD version 7.4.1 or later. 3. Apply configuration changes if required. 4. Restart affected devices.
🔧 Temporary Workarounds
Disable Geolocation Access Control
allTemporarily disable geolocation-based access control policies until patching can be completed.
configure terminal
no access-list GEO-ACL
write memory
Implement Additional Network Controls
allAdd supplementary network segmentation or firewall rules to compensate for geolocation bypass risk.
configure terminal
access-list COMPENSATION extended deny ip any any
write memory
🧯 If You Can't Patch
- Implement network segmentation to isolate resources protected by geolocation controls
- Add additional authentication layers for services behind geolocation controls
🔍 How to Verify
Check if Vulnerable:
Check FTD version via CLI: 'show version' and verify if using geolocation access control features.Check Version:
show version | include VersionVerify Fix Applied:
Verify version is 7.4.1 or later: 'show version' and test geolocation policy enforcement.📡 Detection & Monitoring
Log Indicators:
- Unexpected traffic from blocked geographic regions in FTD logs
- Geolocation policy bypass events
Network Indicators:
- Traffic from unexpected geographic sources reaching protected resources
- Anomalous connection patterns
SIEM Query:
source="ftd_logs" AND (geo_bypass OR unexpected_region)