low
3.9
CWE
200
Advisory Published
Advisory Published
Updated

CVE-2023-45143: Undici's cookie header not cleared on cross-origin redirect in fetch

First published: Thu Oct 12 2023(Updated: )

### Impact Undici clears Authorization headers on cross-origin redirects, but does not clear `Cookie` headers. By design, `cookie` headers are [forbidden request headers](https://fetch.spec.whatwg.org/#forbidden-request-header), disallowing them to be set in `RequestInit.headers` in browser environments. Since Undici handles headers more liberally than the specification, there was a disconnect from the assumptions the spec made, and Undici's implementation of fetch. As such this may lead to accidental leakage of cookie to a 3rd-party site or a malicious attacker who can control the redirection target (ie. an open redirector) to leak the cookie to the 3rd party site. ### Patches This was patched in [e041de359221ebeae04c469e8aff4145764e6d76](https://github.com/nodejs/undici/commit/e041de359221ebeae04c469e8aff4145764e6d76), which is included in version 5.26.2.

Credit: security-advisories@github.com security-advisories@github.com security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
Nodejs Undici<5.26.2
npm/undici<5.26.2
5.26.2
redhat/node-undici<5.26.2
5.26.2
Fedoraproject Fedora=37
Fedoraproject Fedora=38
Fedoraproject Fedora=39

Remedy

https://github.com/nodejs/undici/commit/e041de359221ebeae04c469e8aff4145764e6d76

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2023-45143?

    CVE-2023-45143 is a vulnerability in the Undici HTTP/1.1 client for Node.js version 5.26.2 and earlier.

  • What is the impact of CVE-2023-45143?

    The impact of CVE-2023-45143 is that Undici clears Authorization headers on cross-origin redirects, but does not clear Cookie headers, which could potentially lead to security breaches.

  • How can I fix CVE-2023-45143?

    To fix CVE-2023-45143, upgrade to Undici version 5.26.2 or later.

  • What is the severity of CVE-2023-45143?

    CVE-2023-45143 has a severity rating of 3.9 (low).

  • Where can I find more information about CVE-2023-45143?

    You can find more information about CVE-2023-45143 in the references provided on the GitHub page for Undici.

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