How the CVE Works:
CVE-2023-30588 is an HTTP request smuggling vulnerability in Node.js due to improper parsing of chunked transfer encoding headers. Attackers can craft malformed HTTP requests with conflicting `Content-Length` and `Transfer-Encoding` headers, tricking Node.js into processing requests incorrectly. This allows request smuggling, where a single HTTP request is interpreted as two separate requests by backend systems, leading to cache poisoning, credential hijacking, or unauthorized actions. The flaw arises from Node.js failing to normalize ambiguous headers, enabling attackers to bypass security controls.
DailyCVE Form:
Platform: Node.js
Version: <18.16.1, <20.3.1
Vulnerability: HTTP Smuggling
Severity: Critical
Date: 2023-06-22
What Undercode Say:
Exploit:
curl -X POST -H "Transfer-Encoding: chunked" -H "Content-Length: 0" -d "smuggled" http://target
Detection:
grep -r "Transfer-Encoding" /path/to/nodejs/code
Mitigation:
1. Update Node.js to v18.16.1 or v20.3.1+.
- Use a reverse proxy (e.g., Nginx) to normalize headers.
3. Validate headers via middleware:
app.use((req, res, next) => {
if (req.headers[bash] && req.headers[bash]) {
res.status(400).send("Invalid headers");
} else next();
});
Analytics:
- CVSS Score: 9.8 (Critical)
- Attack Vector: Network
- Patch Commit: bash
Testing:
import requests
headers = {"Transfer-Encoding": "chunked", "Content-Length": "0"}
requests.post("http://target", headers=headers, data="smuggled")
Firewall Rule:
iptables -A INPUT -p tcp --dport 80 -m string --string "Transfer-Encoding" --algo bm -j DROP
Log Monitoring:
tail -f /var/log/nodejs.log | grep -i "transfer-encoding"
References:
References:
Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-29411
Extra Source Hub:
Undercode
