CVE-2024-52029
📋 TL;DR
This vulnerability in Netgear R7000P routers allows attackers to trigger a stack overflow via the pptp_user_netmask parameter in the genie_pptp.cgi script. Attackers can cause a Denial of Service (DoS) by sending a specially crafted POST request, potentially crashing the router. Users running Netgear R7000P firmware version 1.3.3.154 are affected.
💻 Affected Systems
- Netgear R7000P
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Router becomes completely unresponsive, requiring physical power cycle or factory reset to restore functionality, disrupting all network services.
Likely Case
Router crashes or becomes unstable, requiring reboot and causing temporary network outage for connected devices.
If Mitigated
If router is behind firewall with restricted WAN access, risk is limited to internal attackers or compromised internal devices.
🎯 Exploit Status
Public GitHub repository contains proof-of-concept. Exploit requires sending POST request to vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Netgear security advisory for latest patched version
Vendor Advisory: https://www.netgear.com/about/security/
Restart Required: Yes
Instructions:
1. Log into router admin interface. 2. Navigate to Advanced > Administration > Firmware Update. 3. Check for updates. 4. If update available, download and install. 5. Router will reboot automatically.
🔧 Temporary Workarounds
Disable PPTP VPN
allDisable PPTP VPN functionality if not needed to remove vulnerable endpoint
Restrict Access to Admin Interface
allConfigure firewall rules to restrict access to router admin interface from WAN
🧯 If You Can't Patch
- Place router behind external firewall with strict inbound rules
- Disable remote administration and restrict admin interface to trusted internal IPs only
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under Advanced > Administration > Firmware UpdateCheck Version:
Not applicable - check via web interfaceVerify Fix Applied:
Verify firmware version is updated beyond v1.3.3.154📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /genie_pptp.cgi with large pptp_user_netmask parameter
- Router crash/reboot logs
Network Indicators:
- POST requests to router IP on port 80/443 targeting /genie_pptp.cgi with abnormal payload size
SIEM Query:
source_ip="router_ip" AND http_method="POST" AND uri="/genie_pptp.cgi" AND content_length>100