CVE-2024-25331
📋 TL;DR
This vulnerability allows unauthenticated attackers on the local network to execute arbitrary code on affected D-Link routers by exploiting a buffer overflow in the HNAP stack. Attackers can gain full control of the device, potentially compromising network security. Users of DIR-822 Rev. B and DIR-822-CA Rev. B routers with vulnerable firmware versions are affected.
💻 Affected Systems
- D-Link DIR-822 Rev. B
- D-Link DIR-822-CA Rev. B
⚠️ 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 router compromise allowing attackers to intercept all network traffic, install persistent malware, pivot to other devices, and use the router as a botnet node.
Likely Case
Router takeover leading to DNS hijacking, credential theft from network traffic, and installation of backdoors for persistent access.
If Mitigated
Limited impact if routers are behind firewalls with strict network segmentation and traffic monitoring.
🎯 Exploit Status
The vulnerability requires LAN-side access but no authentication, making exploitation straightforward for attackers with network access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check D-Link support for latest firmware updates
Vendor Advisory: https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10372
Restart Required: Yes
Instructions:
1. Visit D-Link support website. 2. Download latest firmware for your specific model. 3. Log into router admin interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Wait for router to reboot.
🔧 Temporary Workarounds
Disable HNAP Protocol
allTurn off the vulnerable HNAP service if not required for functionality
Network Segmentation
allIsolate routers on separate VLANs with strict access controls
🧯 If You Can't Patch
- Replace affected routers with newer models or different vendors
- Implement strict network access controls and monitor for suspicious traffic
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface and compare with vulnerable versions listed in advisoryCheck Version:
Log into router web interface and check System Status or Firmware Update sectionVerify Fix Applied:
Verify firmware version has been updated to a version not listed in the vulnerability advisory📡 Detection & Monitoring
Log Indicators:
- Unusual HNAP protocol requests
- Multiple failed authentication attempts followed by successful access
- Unexpected firmware modification timestamps
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
- Unexpected port scans originating from router
SIEM Query:
source="router_logs" AND (protocol="HNAP" AND (request_size>threshold OR pattern="overflow"))🔗 References
- https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10372
- https://www.ensigninfosecurity.com/advisories/vulnerability-advisories/2
- https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10372
- https://www.ensigninfosecurity.com/advisories/vulnerability-advisories/2
