CVE-2023-48725
📋 TL;DR
This CVE describes a stack-based buffer overflow vulnerability in Netgear RAX30 routers' JSON parsing functionality. An authenticated attacker can send a specially crafted HTTP request to execute arbitrary code on the device. This affects Netgear RAX30 routers running vulnerable firmware versions.
💻 Affected Systems
- Netgear RAX30
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing persistent access, network traffic interception, lateral movement to connected devices, and potential botnet recruitment.
Likely Case
Router compromise leading to credential theft, DNS hijacking, man-in-the-middle attacks, and network disruption.
If Mitigated
Limited impact due to authentication requirement and network segmentation, potentially only affecting the router itself.
🎯 Exploit Status
Exploitation requires authentication but detailed technical analysis is publicly available in Talos reports.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Netgear support for latest firmware
Vendor Advisory: https://kb.netgear.com/000066037/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-the-RAX30-PSV-2023-0160
Restart Required: Yes
Instructions:
1. Log into router admin interface. 2. Navigate to Advanced > Administration > Firmware Update. 3. Check for updates and apply latest firmware. 4. Reboot router after update completes.
🔧 Temporary Workarounds
Disable remote administration
allPrevents external attackers from accessing the vulnerable interface
Change default credentials
allMitigates risk by requiring stronger authentication
🧯 If You Can't Patch
- Segment router on isolated network VLAN
- Implement strict firewall rules limiting access to router management interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface under Advanced > Administration > Firmware UpdateCheck Version:
Check via router web interface or SSH if enabled: cat /etc/versionVerify Fix Applied:
Confirm firmware version is newer than 1.0.11.96 and 1.0.7.78📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to router management interface
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- HTTP traffic to router management port with malformed JSON payloads
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND (http_method="POST" AND uri="*getblockschedule*" OR message="*buffer overflow*")🔗 References
- https://kb.netgear.com/000066037/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-the-RAX30-PSV-2023-0160
- https://talosintelligence.com/vulnerability_reports/TALOS-2023-1887
- https://kb.netgear.com/000066037/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-the-RAX30-PSV-2023-0160
- https://talosintelligence.com/vulnerability_reports/TALOS-2023-1887
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2023-1887
