CVE-2022-28573
📋 TL;DR
CVE-2022-28573 is a critical command injection vulnerability in D-Link DIR-823-Pro routers that allows attackers to execute arbitrary system commands via the system_time_timezone parameter. This affects all users of D-Link DIR-823-Pro v1.0.2 routers, potentially giving attackers complete control over the device.
💻 Affected Systems
- D-Link DIR-823-Pro
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full router compromise allowing attackers to intercept all network traffic, install persistent malware, pivot to internal networks, 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 router is behind firewall with restricted WAN access and strong network segmentation.
🎯 Exploit Status
Exploitation requires authentication to the web interface. Public proof-of-concept code exists in GitHub repositories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check D-Link security bulletin for latest firmware
Vendor Advisory: https://www.dlink.com/en/security-bulletin/
Restart Required: Yes
Instructions:
1. Log into D-Link support portal 2. Download latest firmware for DIR-823-Pro 3. Access router web interface 4. Navigate to System Tools > Firmware Upgrade 5. Upload and install new firmware 6. Reboot router
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to web management interface
Access router web interface > System Tools > Admin > Disable 'Enable Remote Management'
Restrict Management Access
allLimit web interface access to specific IP addresses
Access router web interface > Advanced > Firewall > Access Control > Add allowed IPs only
🧯 If You Can't Patch
- Replace vulnerable router with updated model or different vendor
- Place router behind dedicated firewall with strict inbound rules blocking all unnecessary ports
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface: Login > Status > Device Info > Firmware VersionCheck Version:
curl -s http://router-ip/status/deviceinfo | grep FirmwareVerify Fix Applied:
Verify firmware version shows newer than v1.0.2 after update📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/SetNTPserverSeting
- Commands with shell metacharacters in system_time_timezone parameter
- Unexpected processes running on router
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
- Port scans originating from router
SIEM Query:
source="router_logs" AND (uri_path="/goform/SetNTPserverSeting" OR param="system_time_timezone" AND value MATCHES "[;&|`$()]+")