CVE-2023-44423
📋 TL;DR
This vulnerability allows network-adjacent attackers to execute arbitrary code as root on D-Link DIR-X3260 routers by exploiting a command injection flaw in the prog.cgi program via HNAP requests. It requires authentication but can be bypassed, affecting users of these routers with default or vulnerable configurations.
💻 Affected Systems
- D-Link DIR-X3260
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full root-level compromise of the router, enabling attackers to steal credentials, intercept traffic, pivot to internal networks, or deploy persistent malware.
Likely Case
Attackers on the local network gain unauthorized access to the router, potentially modifying settings, launching attacks on internal devices, or disrupting network services.
If Mitigated
If patched or isolated, the router remains secure with no impact, though unpatched devices in controlled environments may face limited risk from trusted users.
🎯 Exploit Status
Exploitation involves sending crafted HNAP requests to prog.cgi; authentication bypass increases likelihood of weaponization, but no public PoC is confirmed from the input.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in input; check vendor advisory for latest firmware.
Vendor Advisory: Not provided in input; refer to D-Link security advisories.
Restart Required: Yes
Instructions:
1. Log into the router's web interface. 2. Navigate to firmware update section. 3. Download and install the latest firmware from D-Link's official site. 4. Reboot the router after update.
🔧 Temporary Workarounds
Disable Remote Management
allPrevents external access to the vulnerable web interface by disabling remote management features.
Log into router web interface, go to Advanced > Remote Management, set to Disabled.
Restrict Network Access
linuxUse firewall rules to limit access to the router's web interface (ports 80/443) to trusted IPs only.
Configure router firewall: iptables -A INPUT -p tcp --dport 80,443 -s TRUSTED_IP -j ACCEPT; iptables -A INPUT -p tcp --dport 80,443 -j DROP
🧯 If You Can't Patch
- Isolate the router on a dedicated VLAN to limit exposure to network-adjacent attacks.
- Monitor network traffic for unusual HNAP requests to prog.cgi and implement strict access controls.
🔍 How to Verify
Check if Vulnerable:
Check firmware version via router web interface or SSH: if version is older than patched release, assume vulnerable.Check Version:
Log into router web interface and check System Info, or use: curl -s http://router-ip/status.html | grep firmwareVerify Fix Applied:
After update, confirm firmware version matches the patched release from D-Link's advisory.📡 Detection & Monitoring
Log Indicators:
- Unusual HNAP POST requests to /prog.cgi with command injection patterns in logs.
Network Indicators:
- Suspicious traffic to router ports 80/443 from unauthorized internal IPs.
SIEM Query:
source="router_logs" AND url="/prog.cgi" AND (method="POST" AND body CONTAINS "SetTriggerPPPoEValidate" AND body MATCHES "[;|&]" )