Impact

Authorization headers are already cleared on cross-origin redirect in
https://github.com/nodejs/undici/blob/main/lib/handler/redirect.js#L189, based on #872.

However, cookie headers which are sensitive headers and are official headers found in the spec, remain uncleared. There also has been active discussion of implementing a cookie store #1441, which suggests that there are active users using cookie headers in undici.
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 v5.7.1.

Workarounds

By default, this vulnerability is not exploitable.
Do not enable redirections, i.e. maxRedirections: 0 (the default).

References

https://hackerone.com/reports/1635514
https://curl.se/docs/CVE-2018-1000007.html
https://curl.se/docs/CVE-2022-27776.html

For more information

If you have any questions or comments about this advisory:

• Open an issue in undici repository
• To make a report, follow the SECURITY document