CVE-2024-6045
📋 TL;DR
Certain D-Link wireless routers contain a factory testing backdoor that allows unauthenticated attackers on the local network to enable Telnet service via a specific URL. Attackers can then log in using administrator credentials extracted from firmware analysis. This affects users of specific D-Link router models.
💻 Affected Systems
- D-Link wireless routers (specific models not fully disclosed in provided references)
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of router configuration, network traffic interception, malware deployment to connected devices, and persistent access to internal network.
Likely Case
Unauthorized access to router administration, network configuration changes, DNS hijacking, and credential theft from network traffic.
If Mitigated
Limited to internal network reconnaissance if proper network segmentation and access controls are implemented.
🎯 Exploit Status
Exploitation requires accessing specific URL and using extracted credentials. No authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific firmware versions
Vendor Advisory: https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10398
Restart Required: Yes
Instructions:
1. Check affected models in vendor advisory. 2. Download latest firmware from D-Link support site. 3. Log into router admin interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable Telnet service
allManually disable Telnet service if not needed
Router-specific commands vary by model
Network segmentation
allIsolate router management interface to trusted network segment
🧯 If You Can't Patch
- Replace affected routers with non-vulnerable models
- Implement strict network access controls to limit local network exposure
🔍 How to Verify
Check if Vulnerable:
Check router model and firmware version against vendor advisory. Attempt to access specific URL (details not fully disclosed in references).Check Version:
Router-specific command (typically via web interface or SSH/Telnet)Verify Fix Applied:
After patching, verify Telnet service cannot be enabled via backdoor URL and test with extracted credentials.📡 Detection & Monitoring
Log Indicators:
- Unexpected Telnet service activation
- Access to specific backdoor URL
- Failed authentication attempts with default/admin credentials
Network Indicators:
- Unexpected Telnet port (23) traffic
- HTTP requests to specific router endpoints
SIEM Query:
Search for: (destination_port:23 AND source_ip:internal) OR (http_uri:"/specific_backdoor_path" AND destination_ip:router_ip)🔗 References
- https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10398
- https://www.twcert.org.tw/en/cp-139-7880-629f5-2.html
- https://www.twcert.org.tw/tw/cp-132-7879-da630-1.html
- https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10398
- https://www.twcert.org.tw/en/cp-139-7880-629f5-2.html
- https://www.twcert.org.tw/tw/cp-132-7879-da630-1.html
