CVE-2024-27683
📋 TL;DR
This CVE describes a critical stack-based buffer overflow vulnerability in D-Link Go-RT-AC750 routers. Attackers can exploit it by sending a specially crafted POST request to the hnap_main function, potentially allowing remote code execution. All users of affected D-Link Go-RT-AC750 routers with vulnerable firmware versions are at risk.
💻 Affected Systems
- D-Link Go-RT-AC750 GORTAC750_A1
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to remote code execution, persistent backdoor installation, network traffic interception, and lateral movement to other devices on the network.
Likely Case
Router compromise allowing attacker to modify DNS settings, intercept traffic, create persistent access, and potentially pivot to other network devices.
If Mitigated
If properly segmented and monitored, impact limited to isolated router compromise with minimal lateral movement potential.
🎯 Exploit Status
Exploit requires sending POST request to vulnerable endpoint, making it relatively easy to weaponize
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check D-Link security bulletin for latest patched version
Vendor Advisory: https://www.dlink.com/en/security-bulletin/
Restart Required: Yes
Instructions:
1. Visit D-Link support website 2. Download latest firmware for Go-RT-AC750 3. Log into router admin interface 4. Navigate to firmware update section 5. Upload and apply new firmware 6. Reboot router
🔧 Temporary Workarounds
Disable Remote Administration
allDisable web administration interface from WAN/Internet side
Network Segmentation
allPlace router on isolated network segment with strict firewall rules
🧯 If You Can't Patch
- Replace affected router with patched or different model
- Implement strict network segmentation and firewall rules to limit router exposure
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface and compare against vulnerable versions listed in D-Link advisoryCheck Version:
Check via router web interface or SSH if available: show version or similar commandVerify Fix Applied:
Verify firmware version has been updated to patched version in router admin interface📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to hnap_main endpoint
- Unusual traffic patterns to router administration interface
- Failed authentication attempts followed by POST requests
Network Indicators:
- POST requests to router IP on port 80/443 with unusual payload sizes
- Traffic to router from unexpected external sources
SIEM Query:
source_ip="router_ip" AND (http_method="POST" AND uri CONTAINS "hnap_main")🔗 References
- https://drive.google.com/file/d/18RhbBnaD_kH16Y6C-7TpSSPUmYKKyU_k/view
- https://gist.github.com/sunwithmoon/428c3871482a600382fec0a1994a518b
- https://www.dlink.com/en/security-bulletin/
- https://drive.google.com/file/d/18RhbBnaD_kH16Y6C-7TpSSPUmYKKyU_k/view
- https://gist.github.com/sunwithmoon/428c3871482a600382fec0a1994a518b
- https://www.dlink.com/en/security-bulletin/
