CVE-2024-57540
📋 TL;DR
A buffer overflow vulnerability exists in Linksys E8450 routers where the 'action' field is copied to the stack without length verification. This allows attackers to potentially execute arbitrary code or crash the device. Only Linksys E8450 v1.2.00.360516 users 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 with proper network segmentation and firewall rules
🎯 Exploit Status
Proof of concept available on GitHub; exploitation requires crafting specific network packets
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Linksys support site for firmware updates
2. Download latest firmware if available
3. Upload via router admin interface
4. Reboot router after installation
🔧 Temporary Workarounds
Network Segmentation
allIsolate router management interface from untrusted networks
Firewall Rules
linuxBlock external access to router management interface
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Replace affected router with different model or updated version
- Implement strict network access controls to limit exposure
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under Administration > Firmware UpdateCheck Version:
curl -s http://router-ip/status.cgi | grep firmwareVerify Fix Applied:
Verify firmware version is no longer v1.2.00.360516📡 Detection & Monitoring
Log Indicators:
- Multiple malformed HTTP requests to router management interface
- Router crash/reboot events
Network Indicators:
- Unusual traffic patterns to router management ports
- Exploit-specific payload patterns in network traffic
SIEM Query:
source="router-logs" AND (event="crash" OR event="reboot") OR (http_request CONTAINS "action=" AND length(http_request) > 1000)