CVE-2024-28340
📋 TL;DR
This vulnerability allows unauthenticated attackers to access sensitive information from Netgear CBR40, CBK40, and CBK43 routers via the currentsetting.htm component. The information leak exposes potentially confidential router configuration data without requiring any authentication. Users of affected Netgear router models with vulnerable firmware versions are impacted.
💻 Affected Systems
- Netgear CBR40
- Netgear CBK40
- Netgear CBK43
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers obtain full router configuration including network credentials, admin passwords, Wi-Fi settings, and network topology, enabling further attacks on the network.
Likely Case
Attackers gather sensitive router configuration information that could be used for reconnaissance or to facilitate other attacks against the network.
If Mitigated
With proper network segmentation and access controls, the impact is limited to information disclosure about the router itself.
🎯 Exploit Status
Exploitation requires only HTTP access to the router's web interface on port 80/443.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.netgear.com/about/security/
Restart Required: No
Instructions:
1. Check Netgear security advisory page for updates. 2. If patch available, download firmware from Netgear support site. 3. Log into router admin interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware.
🔧 Temporary Workarounds
Block External Access
allPrevent external access to router web interface
Configure firewall to block inbound traffic to router ports 80, 443, 8080 from external networks
Network Segmentation
allIsolate router management interface
Place router management interface on separate VLAN with restricted access
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach the router's web interface
- Monitor network traffic for unauthorized access attempts to router management pages
🔍 How to Verify
Check if Vulnerable:
Access http://[router-ip]/currentsetting.htm without authentication; if it returns configuration data, the device is vulnerable.Check Version:
Log into router admin interface and check firmware version in settingsVerify Fix Applied:
Attempt to access currentsetting.htm without authentication; should return access denied or 404 error.📡 Detection & Monitoring
Log Indicators:
- HTTP GET requests to /currentsetting.htm from unauthorized IPs
- Multiple failed authentication attempts followed by currentsetting.htm access
Network Indicators:
- Unusual HTTP traffic to router IP on port 80/443
- External IPs accessing router management pages
SIEM Query:
source_ip=external AND dest_ip=router_ip AND (url_path="*currentsetting*" OR status_code=200)🔗 References
- https://github.com/funny-mud-peee/IoT-vuls/blob/main/Netgear%20CBR40%5CCBK40%5CCBK43/Info%20Leak%20in%20Netgear-CBR40%E3%80%81CBK40%E3%80%81CBK43%20Router%EF%BC%88currentsetting.htm%EF%BC%89.md
- https://www.netgear.com/about/security/
- https://github.com/funny-mud-peee/IoT-vuls/blob/main/Netgear%20CBR40%5CCBK40%5CCBK43/Info%20Leak%20in%20Netgear-CBR40%E3%80%81CBK40%E3%80%81CBK43%20Router%EF%BC%88currentsetting.htm%EF%BC%89.md
- https://www.netgear.com/about/security/
