CVE-2023-26615
📋 TL;DR
CVE-2023-26615 is a password reset vulnerability in D-Link DIR-823G routers that allows unauthenticated attackers to reset the web management interface password via the SetMultipleActions API. This affects users of DIR-823G routers with vulnerable firmware, potentially allowing attackers to take full administrative control of the device.
💻 Affected Systems
- D-Link DIR-823G
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain full administrative control of the router, enabling them to intercept traffic, redirect DNS, install malware, or use the device as part of a botnet.
Likely Case
Attackers reset the admin password and gain persistent access to the router's management interface, potentially compromising network security and privacy.
If Mitigated
With proper network segmentation and access controls, the impact is limited to the router itself rather than the entire network.
🎯 Exploit Status
Public proof-of-concept code is available on GitHub. The exploit requires sending crafted HTTP requests to the router's HNAP1 interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: Yes
Instructions:
1. Check D-Link's official website for firmware updates. 2. If available, download the latest firmware. 3. Log into router admin interface. 4. Navigate to firmware update section. 5. Upload and apply the new firmware. 6. Reboot the router.
🔧 Temporary Workarounds
Disable Remote Management
allDisable remote access to the router's web management interface to prevent internet-based attacks.
Restrict Management Interface Access
allConfigure firewall rules to restrict access to the router's management interface to trusted IP addresses only.
🧯 If You Can't Patch
- Replace the vulnerable router with a different model that receives security updates
- Isolate the router in a separate network segment to limit potential damage
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface: Login > Tools > Firmware. If version is 1.02B05, device is vulnerable.Check Version:
curl -s http://router-ip/HNAP1/ | grep -i versionVerify Fix Applied:
After updating firmware, verify the version is no longer 1.02B05. Test if password reset via SetMultipleActions API is still possible.📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts followed by successful password reset
- Unusual HNAP1 protocol requests to SetMultipleActions endpoint
Network Indicators:
- HTTP POST requests to /HNAP1/ with SetMultipleActions in payload
- Unusual traffic patterns from router management interface
SIEM Query:
source="router_logs" AND ("SetMultipleActions" OR "password reset")🔗 References
- https://github.com/726232111/VulIoT/tree/main/D-Link/DIR823G%20V1.0.2B05/HNAP1
- https://github.com/726232111/VulIoT/tree/main/D-Link/DIR823G%20V1.0.2B05/HNAP1/SetMultipleActions
- https://github.com/726232111/VulIoT/tree/main/D-Link/DIR823G%20V1.0.2B05/HNAP1
- https://github.com/726232111/VulIoT/tree/main/D-Link/DIR823G%20V1.0.2B05/HNAP1/SetMultipleActions
