CVE-2024-57543
📋 TL;DR
A buffer overflow vulnerability exists in the Linksys E8450 router firmware where the dhcpstart_ip field is copied to the stack without length verification. This allows attackers to potentially execute arbitrary code or crash the device. Only users of Linksys E8450 routers with the specific vulnerable firmware version are affected.
💻 Affected Systems
- Linksys E8450
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistence, and network infiltration.
Likely Case
Denial of service causing router crash and network disruption.
If Mitigated
Limited impact if network segmentation isolates the router and external access is restricted.
🎯 Exploit Status
Proof of concept available in GitHub repository. Exploitation requires network access to the router's management interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check Linksys support site for firmware updates. 2. Download latest firmware. 3. Access router admin interface. 4. Navigate to firmware update section. 5. Upload and install new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router management interface
Network Segmentation
allIsolate router management interface to trusted network segment
🧯 If You Can't Patch
- Replace affected router with updated model
- Implement strict network access controls to limit exposure
🔍 How to Verify
Check if Vulnerable:
Access router admin interface, navigate to firmware version page, check if version matches v1.2.00.360516Check Version:
curl -s http://router-ip/status.cgi | grep firmware_versionVerify Fix Applied:
Check firmware version after update to confirm it's different from v1.2.00.360516📡 Detection & Monitoring
Log Indicators:
- Unusual DHCP configuration requests
- Router crash/reboot events
- Multiple failed login attempts
Network Indicators:
- Unusual traffic to router management port
- Malformed DHCP packets
SIEM Query:
source="router_logs" AND (event="crash" OR event="reboot") OR (http_request LIKE "%dhcpstart_ip%")