PRIOn knowledge basePRION:CVE-2023-45143Authorization
Undici is an HTTP/1.1 client written from scratch for Node.js. Prior to version 5.26.2, Undici already cleared Authorization headers on cross-origin redirects, but did not clear Cookie headers. By design, cookie headers are forbidden request headers, disallowing them to be set in RequestInit.headers in browser environments. Since undici handles headers more liberally than the spec, 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 third-party site or a malicious attacker who can control the redirection target (ie. an open redirector) to leak the cookie to the third party site. This was patched in version 5.26.2. There are no known workarounds.
References
github.com/nodejs/undici/commit/e041de359221ebeae04c469e8aff4145764e6d76
github.com/nodejs/undici/releases/tag/v5.26.2
github.com/nodejs/undici/security/advisories/GHSA-q768-x9m6-m9qp
github.com/nodejs/undici/security/advisories/GHSA-wqq4-5wpv-mx2g
hackerone.com/reports/2166948
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