CVE-2023-38932
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on affected Tenda routers via a stack overflow in the SafeEmailFilter function. Attackers can exploit this by sending specially crafted requests to the vulnerable parameter, potentially gaining full control of the device. Users of specific Tenda router models with vulnerable firmware versions are affected.
💻 Affected Systems
- Tenda F1202
- Tenda PA202
- Tenda PW201A
- Tenda FH1202
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to remote code execution, credential theft, network pivoting, and persistent backdoor installation.
Likely Case
Router takeover allowing traffic interception, DNS manipulation, and lateral movement into connected networks.
If Mitigated
Limited impact if devices are behind firewalls with strict ingress filtering and network segmentation.
🎯 Exploit Status
Public proof-of-concept available in GitHub repository. Exploitation requires network access to web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.netgear.com/about/security/
Restart Required: Yes
Instructions:
1. Check Tenda support site for firmware updates. 2. Download latest firmware for your model. 3. Upload via web interface. 4. Reboot router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to web management interface
Network Segmentation
allIsolate routers from critical network segments
🧯 If You Can't Patch
- Implement strict firewall rules blocking all inbound traffic to router management interfaces
- Replace vulnerable devices with supported models from different vendors
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under System Status or About pageCheck Version:
curl -s http://router-ip/ | grep -i versionVerify Fix Applied:
Verify firmware version is updated beyond vulnerable versions listed📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/SafeEmailFilter
- Multiple failed authentication attempts
- Unexpected reboots
Network Indicators:
- Unusual outbound connections from router
- DNS query anomalies
- Traffic redirection patterns
SIEM Query:
source="router_logs" AND (uri="/goform/SafeEmailFilter" OR "page parameter overflow")