CVE-2023-45215
📋 TL;DR
A stack-based buffer overflow vulnerability in Realtek rtl819x Jungle SDK's boa setRepeaterSsid function allows remote attackers to execute arbitrary code via crafted network requests. This affects devices using Realtek rtl819x chipsets with Jungle SDK v3.4.11. Network-connected devices running vulnerable firmware are at risk.
💻 Affected Systems
- Realtek rtl819x-based devices using Jungle SDK
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise leading to persistent backdoor installation, lateral movement within network, and botnet recruitment.
Likely Case
Remote code execution allowing attacker to control device, intercept traffic, or disrupt network services.
If Mitigated
Limited impact if network segmentation and strict firewall rules prevent external access to vulnerable services.
🎯 Exploit Status
Exploitation requires sending crafted requests to the boa web server's setRepeaterSsid functionality. No authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v3.4.12 or later
Vendor Advisory: https://www.realtek.com/en/security-advisory
Restart Required: Yes
Instructions:
1. Contact device manufacturer for updated firmware. 2. Download firmware update. 3. Apply update via device management interface. 4. Reboot device.
🔧 Temporary Workarounds
Disable boa web server
linuxDisable or block access to the boa web server service
killall boa
systemctl stop boa
update-rc.d boa disable
Network segmentation
allIsolate affected devices in separate VLAN with strict firewall rules
🧯 If You Can't Patch
- Implement strict network ACLs to block external access to port 80/443 on affected devices
- Deploy network intrusion detection rules to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check device firmware version and confirm it uses Realtek rtl819x Jungle SDK v3.4.11. Test by attempting to access boa web server on port 80/443.Check Version:
cat /proc/version | grep -i realtek || dmesg | grep -i rtl819xVerify Fix Applied:
Verify firmware version is updated to v3.4.12 or later. Test that setRepeaterSsid functionality no longer accepts malformed requests.📡 Detection & Monitoring
Log Indicators:
- Multiple failed HTTP requests to setRepeaterSsid endpoint
- Unusual process spawning from boa service
- Memory corruption errors in system logs
Network Indicators:
- Unusual HTTP POST requests to /cgi-bin/boaform/setRepeaterSsid with long payloads
- Traffic spikes to device management ports
SIEM Query:
source="boa" AND (uri="/cgi-bin/boaform/setRepeaterSsid" OR method="POST") AND bytes>1024