CVE-2024-54808
📋 TL;DR
This CVE describes a critical stack-based buffer overflow vulnerability in Netgear WNR854T routers that allows remote attackers to execute arbitrary code. The vulnerability exists in the SetDefaultConnectionService function due to improper use of sscanf without bounds checking. All users of affected Netgear WNR854T routers are at risk of complete device compromise.
💻 Affected Systems
- Netgear WNR854T
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router takeover leading to persistent backdoor installation, network traffic interception, credential theft, and lateral movement to connected devices.
Likely Case
Router compromise allowing attackers to redirect DNS, intercept traffic, or use the device as a botnet node for DDoS attacks.
If Mitigated
Limited impact if device is isolated behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
The vulnerability requires no authentication and has a public proof-of-concept available, making exploitation straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch is available. Consider replacing the device with a supported model or implementing network-level mitigations.
🔧 Temporary Workarounds
Network Isolation
allPlace the router behind a firewall with strict inbound filtering to prevent external exploitation.
Disable Remote Management
allDisable WAN-side management interfaces to reduce attack surface.
🧯 If You Can't Patch
- Replace the router with a supported model that receives security updates
- Segment the network to isolate the router from critical systems
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at http://routerlogin.net or using 'show version' command if accessible via CLI.Check Version:
Check web interface at http://routerlogin.net under Advanced > Administration > Router StatusVerify Fix Applied:
Verify firmware version is no longer 1.5.2. Since no patch exists, replacement is the only fix.📡 Detection & Monitoring
Log Indicators:
- Unusual connection attempts to router management interface
- Multiple failed authentication attempts followed by successful exploit patterns
Network Indicators:
- Unusual outbound connections from router
- DNS hijacking patterns
- Traffic redirection to unexpected destinations
SIEM Query:
source_ip="router_ip" AND (event_type="authentication_failure" OR event_type="buffer_overflow")