CVE-2024-21778
📋 TL;DR
A heap-based buffer overflow vulnerability in Realtek rtl819x Jungle SDK allows arbitrary code execution when processing malicious .dat configuration files. Attackers can upload crafted files to execute code on affected devices. This impacts systems using Realtek rtl819x Jungle SDK v3.4.11 for network device configuration.
💻 Affected Systems
- Realtek rtl819x Jungle SDK
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with root-level arbitrary code execution, enabling persistent backdoors, data theft, and device takeover.
Likely Case
Remote code execution leading to device compromise, network infiltration, and potential lateral movement within the network.
If Mitigated
Limited impact with proper file upload restrictions and network segmentation, potentially causing service disruption but not full compromise.
🎯 Exploit Status
Exploitation requires uploading a malicious .dat file to the vulnerable configuration processing functionality.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Realtek for updated SDK version
Vendor Advisory: https://www.realtek.com/en/
Restart Required: Yes
Instructions:
1. Contact Realtek for patched SDK version. 2. Update affected devices with new firmware. 3. Restart devices to apply changes. 4. Verify fix with version check.
🔧 Temporary Workarounds
Restrict file uploads
allDisable or restrict .dat file upload functionality to the configuration processing system
Network segmentation
allIsolate affected devices from critical networks and internet exposure
🧯 If You Can't Patch
- Implement strict input validation for all file uploads
- Deploy network monitoring for suspicious file upload attempts
🔍 How to Verify
Check if Vulnerable:
Check if device uses Realtek rtl819x Jungle SDK v3.4.11 and has configuration file upload functionality enabledCheck Version:
Check device firmware version via vendor-specific commands (varies by implementation)Verify Fix Applied:
Verify SDK version is updated beyond v3.4.11 and test file upload functionality📡 Detection & Monitoring
Log Indicators:
- Unusual .dat file uploads
- Configuration processing errors
- Memory access violations in system logs
Network Indicators:
- Unexpected file uploads to configuration endpoints
- Suspicious outbound connections from affected devices
SIEM Query:
source="device_logs" AND ("mib_init_value_array" OR ".dat upload" OR "heap overflow")