CVE-2023-43960
📋 TL;DR
This vulnerability in D-LINK DPH-400SE allows remote attackers to escalate privileges through the User Modify function in the Maintenance/Access component. Attackers can gain administrative access to the device, potentially compromising the entire system. All users of affected DPH-400SE devices are at risk.
💻 Affected Systems
- DLINK DPH-400SE
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover allowing attacker to reconfigure settings, intercept communications, install backdoors, or use device as pivot point into internal networks.
Likely Case
Unauthorized administrative access leading to configuration changes, data interception, and potential lateral movement within the network.
If Mitigated
Limited impact if device is isolated, has strong network segmentation, and regular monitoring detects unauthorized access attempts.
🎯 Exploit Status
Exploit requires some level of access but detailed public exploit code exists, making attacks straightforward for knowledgeable attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: Yes
Instructions:
1. Check D-LINK website for firmware updates
2. If update available, download and verify checksum
3. Access device web interface
4. Navigate to firmware update section
5. Upload new firmware file
6. Wait for update to complete
7. Reboot device
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to the device's management interface
Network segmentation
allIsolate DPH-400SE devices in separate VLAN with strict access controls
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach the device management interface
- Enable detailed logging and monitoring for unauthorized access attempts to the User Modify function
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface: System Information > Firmware Version. If version is FRU 2.2.15.8, device is vulnerable.Check Version:
No CLI command available; check via web interface at System Information pageVerify Fix Applied:
After firmware update, verify new version is different from FRU 2.2.15.8 and test User Modify function with non-admin credentials to ensure privilege escalation is prevented.📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts followed by successful User Modify operations
- User privilege changes from non-admin to admin
- Access to Maintenance/Access functions from unusual IP addresses
Network Indicators:
- HTTP POST requests to User Modify endpoints from unauthorized sources
- Unusual traffic patterns to device management interface
SIEM Query:
source="dlink-dph-400se" AND (event="user_modify" OR event="privilege_change") AND user_role="admin"