GitHub: https://github.com/l8BL/CVE-2024-47066
Last Commit: September 24th, 2024

CVE-2024-47066

★ CVE-2024-47066 LobeChat SSRF PoC ★

Description

CVE-2024-47066 : Lobe Chat is an open-source artificial intelligence chat framework. Prior to version 1.19.13, server-side request forgery protection implemented in src/app/api/proxy/route.ts does not consider redirect and could be bypassed when attacker provides an external malicious URL which redirects to internal resources like a private network or loopback address. Version 1.19.13 contains an improved fix for the issue.

Reporter: a1loy

0:00

/0:17

How to use

Git clone

git clone https://github.com/l8BL/CVE-2024-47066.git
cd CVE-2024-47066

Setup Vulnerable Environment

cd docker
docker-compose up -d

(External) LodeChat --> SSRF ATTACK --> (Internal) http://www.internal-service:4000

Install packages

pip install -r requirements.txt

Command

python3 CVE-2024-47066.py -v <URL_TO_EXPLOIT> -i <URL_TO_REQUEST>

Example

python3 CVE-2024-47066.py -v http://localhost:3210 -i http://www.internal-service:4000

Output

CVE-2024-47066

Result

Analysis

Vulnerable point (/app/api/proxy/route.ts)

import { isPrivate } from 'ip';
import { NextResponse } from 'next/server';
import dns from 'node:dns';
import { promisify } from 'node:util';

const lookupAsync = promisify(dns.lookup);

export const runtime = 'nodejs';

/**
 * just for a proxy
 */
export const POST = async (req: Request) => {
  const url = new URL(await req.text());
  let address;

  try {
    const lookupResult = await lookupAsync(url.hostname);
    address = lookupResult.address;
  } catch (err) {
    console.error(`${url.hostname} DNS parser error:`, err);

    return NextResponse.json({ error: 'DNS parser error' }, { status: 504 });
  }

  const isInternalHost = isPrivate(address);

  if (isInternalHost)
    return NextResponse.json({ error: 'Not support internal host proxy' }, { status: 400 });

  const res = await fetch(url.toString());

  return new Response(res.body, { headers: res.headers });
};

Below line 26, there is nowhere to determine the Redirect response. So, when using a URL shortener, you can easily bypass the "isPrivate()" function.

Attack Scenario

Steal EC2 Metadata Credentials

Make Request to http://169.254.169.254

Disclaimer

This repository is not intended to be SSRF exploit to CVE-2024-47066. The purpose of this project is to help people learn about this vulnerability, and perhaps test their own applications.