CVE-2022-28571
📋 TL;DR
D-Link DIR-882 routers running firmware version A1_FW130B06 contain a command injection vulnerability in the /usr/bin/cli binary. This allows authenticated attackers to execute arbitrary commands with root privileges on the device. All users of affected D-Link DIR-882 routers with vulnerable firmware are at risk.
💻 Affected Systems
- D-Link DIR-882
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to install persistent backdoors, intercept all network traffic, pivot to internal networks, or brick the device.
Likely Case
Attacker gains full control of router to modify DNS settings, intercept credentials, or use device as botnet node.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and strong authentication requirements.
🎯 Exploit Status
Exploit requires authentication but command injection is straightforward once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check D-Link advisory for latest patched version
Vendor Advisory: https://www.dlink.com/en/security-bulletin/
Restart Required: Yes
Instructions:
1. Log into D-Link router web interface. 2. Navigate to Firmware Update section. 3. Download latest firmware from D-Link support site. 4. Upload and apply firmware update. 5. Reboot router after update completes.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router management interface
Restrict Management Access
allLimit management interface access to specific IP addresses only
🧯 If You Can't Patch
- Isolate router on separate VLAN with strict firewall rules
- Implement network monitoring for suspicious CLI command execution
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under System Status or Tools > FirmwareCheck Version:
Not applicable - use web interfaceVerify Fix Applied:
Verify firmware version has been updated to patched version📡 Detection & Monitoring
Log Indicators:
- Unusual CLI command execution
- Multiple failed authentication attempts followed by CLI access
Network Indicators:
- Unexpected outbound connections from router
- DNS hijacking patterns
SIEM Query:
source="router.log" AND ("cli" OR "command injection" OR suspicious shell commands)