#VU72403 HTTP response splitting in undici - CVE-2023-23936

Vulnerability identifier: #VU72403

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-23936

CWE-ID: CWE-113

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
undici
Server applications / File servers (FTP/HTTP)

Vendor: Node.js

Description

The vulnerability allows a remote attacker to perform HTTP splitting attacks.

The vulnerability exists due to software does not correctly process CRLF character sequences when handling HTTP "Host" header. A remote attacker can send specially crafted request containing CRLF sequence and make the application to send a split HTTP response.

Successful exploitation of the vulnerability may allow an attacker perform cache poisoning attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

undici: 1.0.0 - 5.19.0

---

External links
https://github.com/nodejs/undici/releases/tag/v5.19.1
https://github.com/nodejs/undici/commit/a2eff05401358f6595138df963837c24348f2034
https://github.com/nodejs/undici/security/advisories/GHSA-5r9g-qh6m-jxff
https://hackerone.com/reports/1820955

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.