CVE-2024-32652
📋 TL;DR
This vulnerability in @hono/node-server versions before 1.10.1 causes application hangs when receiving malformed Host headers. Attackers can send specially crafted Host headers to cause denial of service. Anyone running Hono applications on Node.js with vulnerable versions is affected.
💻 Affected Systems
- @hono/node-server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete application unavailability leading to sustained denial of service for all users
Likely Case
Application hangs requiring manual restart, causing temporary service disruption
If Mitigated
Minimal impact with proper input validation and monitoring
🎯 Exploit Status
Simple HTTP request with malformed Host header triggers the issue
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.10.1
Vendor Advisory: https://github.com/honojs/node-server/security/advisories/GHSA-hgxw-5xg3-69jx
Restart Required: Yes
Instructions:
1. Update package.json to specify @hono/node-server version 1.10.1 or higher. 2. Run npm update @hono/node-server. 3. Restart your Node.js application.
🔧 Temporary Workarounds
Input Validation Middleware
allAdd custom middleware to validate Host header before processing
// Add this middleware to your Hono app
app.use('*', async (c, next) => {
const host = c.req.header('Host');
if (!host || host.includes('/') || host.trim() === '') {
return c.text('Invalid Host header', 400);
}
await next();
});
Reverse Proxy Filtering
linuxConfigure reverse proxy (nginx, Apache) to filter invalid Host headers
# nginx configuration
if ($http_host ~* "^/|^$") {
return 400;
}
🧯 If You Can't Patch
- Implement WAF rules to block requests with malformed Host headers
- Deploy rate limiting to prevent mass exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check package.json or run npm list @hono/node-server to see if version is below 1.10.1Check Version:
npm list @hono/node-serverVerify Fix Applied:
After updating, test with curl: curl -H "Host: /" http://your-app/ should return 400 error instead of hanging📡 Detection & Monitoring
Log Indicators:
- Application hanging without error logs
- Increased request timeouts
- Process restarts without clear cause
Network Indicators:
- HTTP requests with malformed Host headers
- Unusual patterns of requests to same endpoint
SIEM Query:
http.headers.host IN ("/", "", "//") AND http.status_code = null OR http.response_time > 30s🔗 References
- https://github.com/honojs/node-server/commit/d847e60249fd8183ba0998bc379ba20505643204
- https://github.com/honojs/node-server/issues/159
- https://github.com/honojs/node-server/security/advisories/GHSA-hgxw-5xg3-69jx
- https://github.com/honojs/node-server/commit/d847e60249fd8183ba0998bc379ba20505643204
- https://github.com/honojs/node-server/issues/159
- https://github.com/honojs/node-server/security/advisories/GHSA-hgxw-5xg3-69jx
