CVE-2025-8299
📋 TL;DR
This vulnerability is a heap-based buffer overflow in Realtek rtl81xx SDK Wi-Fi driver's MgntActSet_TEREDO_SET_RS_PACKET function, allowing local attackers to escalate privileges to SYSTEM after gaining initial low-privileged code execution. It affects systems using vulnerable versions of the Realtek driver, primarily on Windows, and is rated CVSS 8.8 due to its high impact on confidentiality, integrity, and availability.
💻 Affected Systems
- Realtek rtl81xx SDK Wi-Fi Driver
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker with local access can exploit this to gain SYSTEM privileges, enabling full system compromise, arbitrary code execution, and persistence.
Likely Case
In real-world scenarios, attackers with initial foothold (e.g., via malware or phishing) can escalate privileges to bypass security controls and install additional payloads.
If Mitigated
With proper controls like least privilege, application whitelisting, and timely patching, the impact is reduced to denial-of-service or limited local access.
🎯 Exploit Status
Exploitation involves crafting malicious data to trigger the buffer overflow; referenced as ZDI-CAN-25857, indicating potential for weaponization.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Realtek or device manufacturer for updated driver versions; specific version not provided in CVE.
Vendor Advisory: https://www.zerodayinitiative.com/advisories/ZDI-25-882/
Restart Required: Yes
Instructions:
1. Identify the Realtek driver version via Device Manager or system info. 2. Visit Realtek or OEM website for driver updates. 3. Download and install the latest driver. 4. Restart the system to apply changes.
🔧 Temporary Workarounds
Disable Wi-Fi Adapter
windowsTemporarily disable the affected Wi-Fi adapter to prevent driver usage, reducing attack surface.
netsh interface set interface "Wi-Fi" admin=disable
Apply Least Privilege
allRestrict user accounts to standard privileges to limit initial low-privileged code execution.
🧯 If You Can't Patch
- Implement application control or whitelisting to block unauthorized code execution.
- Use endpoint detection and response (EDR) tools to monitor for privilege escalation attempts.
🔍 How to Verify
Check if Vulnerable:
Check driver version in Device Manager (Network adapters > Realtek rtl81xx) and compare with patched versions from vendor.Check Version:
wmic path win32_pnpsigneddriver where "DeviceName like '%Realtek%'" get DeviceName, DriverVersionVerify Fix Applied:
After update, verify driver version has changed to a non-vulnerable release and test system stability.📡 Detection & Monitoring
Log Indicators:
- Windows Event Logs (e.g., Event ID 4688 for process creation with SYSTEM privileges)
- Driver crash logs or memory access violations
Network Indicators:
- Unusual local network traffic from SYSTEM processes post-exploit
SIEM Query:
Example: EventID=4688 AND NewProcessName contains 'cmd.exe' AND SubjectUserName='SYSTEM'