CVE-2023-50243
📋 TL;DR
Two stack-based buffer overflow vulnerabilities in Realtek rtl819x Jungle SDK's boa formIpQoS functionality allow remote code execution via specially crafted HTTP requests. Attackers can exploit these vulnerabilities by manipulating the 'comment' parameter in HTTP requests. This affects devices using Realtek rtl819x Jungle SDK v3.4.11.
💻 Affected Systems
- Realtek rtl819x Jungle SDK
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote unauthenticated attacker gains full system control, executes arbitrary code, and potentially establishes persistent access on affected devices.
Likely Case
Remote code execution leading to device compromise, data theft, or integration into botnets.
If Mitigated
Limited impact if network segmentation, input validation, and proper access controls are implemented.
🎯 Exploit Status
Exploitation requires crafting specific HTTP requests but no authentication is needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Monitor Realtek for security updates. 2. Check with device manufacturers for firmware updates. 3. Apply patches when available.
🔧 Temporary Workarounds
Disable boa HTTP server
linuxDisable the vulnerable boa HTTP server if not required for device functionality.
systemctl stop boa
systemctl disable boa
Network segmentation
allIsolate affected devices in separate network segments with strict firewall rules.
🧯 If You Can't Patch
- Implement strict network access controls to limit HTTP access to trusted sources only.
- Deploy web application firewall (WAF) rules to filter malicious HTTP requests targeting the comment parameter.
🔍 How to Verify
Check if Vulnerable:
Check if device uses Realtek rtl819x Jungle SDK v3.4.11 and has boa HTTP server running on port 80.Check Version:
Check device firmware documentation or manufacturer specifications for SDK version.Verify Fix Applied:
Verify SDK version is updated beyond v3.4.11 or boa server is disabled.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests with long comment parameters
- Multiple failed HTTP requests to formIpQoS endpoint
Network Indicators:
- HTTP POST requests to formIpQoS with abnormal payload sizes
- Traffic patterns suggesting buffer overflow attempts
SIEM Query:
source="boa" AND (uri="*formIpQoS*" OR method="POST") AND (content_length>1000 OR param="comment")