CVE-2024-45697
📋 TL;DR
This vulnerability affects certain D-Link wireless routers where the telnet service is automatically enabled when the WAN port is connected, exposing hard-coded credentials. Unauthorized remote attackers can use these credentials to log in and execute arbitrary operating system commands. Organizations and home users with affected D-Link router models are at risk.
💻 Affected Systems
- D-Link wireless routers (specific models not fully disclosed in references)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing attackers to intercept all network traffic, install persistent malware, pivot to internal networks, and permanently disable the device.
Likely Case
Attackers gain full administrative control of the router, enabling them to redirect DNS, capture credentials, and use the device as a foothold for further attacks.
If Mitigated
If telnet is disabled or network segmentation isolates the router, impact is limited to denial of service if the device is compromised.
🎯 Exploit Status
Exploitation requires only telnet access and hard-coded credentials. No authentication bypass needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not provided in references
Restart Required: No
Instructions:
1. Check D-Link website for firmware updates for your specific router model. 2. Download and install any available security patches. 3. Monitor vendor communications for official fix.
🔧 Temporary Workarounds
Disable Telnet Service
allManually disable telnet service if router configuration interface allows it
telnet disable
service telnet stop
Block Telnet Port
linuxUse firewall rules to block incoming telnet connections (port 23)
iptables -A INPUT -p tcp --dport 23 -j DROP
🧯 If You Can't Patch
- Replace affected routers with different models or brands
- Implement network segmentation to isolate routers from critical assets
🔍 How to Verify
Check if Vulnerable:
Connect to router's WAN port, then attempt telnet connection to router IP on port 23 using hard-coded credentials (specific credentials not disclosed in references)Check Version:
Check router web interface or use 'show version' via console if availableVerify Fix Applied:
After applying workarounds, attempt telnet connection to verify service is no longer accessible📡 Detection & Monitoring
Log Indicators:
- Failed telnet authentication attempts
- Successful telnet logins from unexpected sources
- Unusual command execution in router logs
Network Indicators:
- Unexpected telnet traffic to router on port 23
- Outbound connections from router to suspicious IPs
SIEM Query:
source_ip=router_ip AND destination_port=23 AND protocol=TCP