CVE-2022-26258
📋 TL;DR
This vulnerability allows unauthenticated remote attackers to execute arbitrary commands on D-Link DIR-820L routers via HTTP POST requests to the 'get set ccp' endpoint. Attackers can gain full control of affected devices, potentially compromising network security. Only D-Link DIR-820L routers running firmware version 1.05B03 are affected.
💻 Affected Systems
- D-Link DIR-820L
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover allowing attackers to install persistent malware, intercept all network traffic, pivot to internal networks, and use the device as part of botnets or for cryptocurrency mining.
Likely Case
Attackers gain shell access to modify router settings, intercept credentials, redirect DNS, and potentially compromise connected devices on the network.
If Mitigated
With proper network segmentation and firewall rules, impact is limited to the router itself, though attackers could still modify network settings and intercept traffic.
🎯 Exploit Status
Multiple public proof-of-concept exploits exist on GitHub, making this easily exploitable by attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check D-Link security bulletin for latest patched version
Vendor Advisory: https://www.dlink.com/en/security-bulletin/
Restart Required: Yes
Instructions:
1. Visit D-Link support site 2. Download latest firmware for DIR-820L 3. Log into router admin interface 4. Navigate to firmware update section 5. Upload and install new firmware 6. Reboot router
🔧 Temporary Workarounds
Disable Remote Management
allDisable remote administration/management features to prevent external exploitation
Firewall Block
linuxBlock external access to router web interface (port 80/443)
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Isolate router on separate VLAN with strict firewall rules
- Implement network monitoring for suspicious HTTP POST requests to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface or attempt to access the vulnerable endpoint with controlled payloadCheck Version:
curl -s http://router-ip/ | grep -i firmwareVerify Fix Applied:
Verify firmware version is updated beyond 1.05B03 and test the vulnerable endpoint with safe payload📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to '/get set ccp' endpoint
- Unusual command execution in router logs
- Multiple failed login attempts followed by POST requests
Network Indicators:
- HTTP POST to router IP on port 80 with command injection patterns
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND "POST" AND "get set ccp"🔗 References
- http://dir-820l.com
- http://dlink.com
- https://github.com/skyedai910/Vuln/tree/master/DIR-820L/command_execution_0
- https://github.com/zhizhuoshuma/cve_info_data/blob/ccaed4b94ba762eb8a8e003bfa762a7754b8182e/Vuln/Vuln/DIR-820L/command_execution_0/README.md
- https://www.dlink.com/en/security-bulletin/
- http://dir-820l.com
- http://dlink.com
- https://github.com/skyedai910/Vuln/tree/master/DIR-820L/command_execution_0
- https://github.com/zhizhuoshuma/cve_info_data/blob/ccaed4b94ba762eb8a8e003bfa762a7754b8182e/Vuln/Vuln/DIR-820L/command_execution_0/README.md
- https://www.dlink.com/en/security-bulletin/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-26258
