CVE-2022-27288
📋 TL;DR
This vulnerability is a stack overflow in D-Link DIR-619 Ax routers version 1.00, specifically in the formSetWanPPTP function. Attackers can exploit it via the curTime parameter to cause a Denial of Service (DoS), potentially crashing the device. Only users of this specific router model and version are affected.
💻 Affected Systems
- D-Link DIR-619 Ax
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device crash requiring physical reboot, potentially leading to extended network downtime and disruption of services.
Likely Case
Router becomes unresponsive, requiring manual reboot to restore functionality, causing temporary network outage.
If Mitigated
If properly segmented and protected, impact limited to isolated network segment with minimal service disruption.
🎯 Exploit Status
Proof-of-concept available in public GitHub repository, exploitation requires network access to router management interface.
🛠️ 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. Visit D-Link support site. 2. Download latest firmware for DIR-619 Ax. 3. Log into router admin interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Wait for reboot.
🔧 Temporary Workarounds
Disable PPTP WAN
allDisable PPTP WAN configuration if not required
Restrict Management Access
allLimit router management interface access to trusted IPs only
🧯 If You Can't Patch
- Segment affected routers on isolated network segments
- Implement network monitoring for abnormal traffic to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System > FirmwareCheck Version:
Check via router web interface or SSH if enabledVerify Fix Applied:
Verify firmware version matches latest from D-Link security bulletin📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts
- Unusual PPTP configuration changes
- Router reboot events
Network Indicators:
- Unusual traffic to router management port (typically 80/443)
- PPTP configuration requests with malformed curTime parameter
SIEM Query:
source_ip="router_ip" AND (http_uri CONTAINS "formSetWanPPTP" OR event_type="router_reboot")