CVE-2023-45143
Undici's cookie header not cleared on cross-origin redirect in fetch
Description
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.
How to fix CVE-2023-45143
To remediate CVE-2023-45143, upgrade the affected package to a fixed version below.
- —upgrade to 18.18.2-r0 or later
- —upgrade to 5.15.0+dfsg1+~cs20.10.9.3-1+deb12u2 or later
- —upgrade to 5.26.2 or later
Is CVE-2023-45143 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 18.18.2-r0
- from 0, < 5.15.0+dfsg1+~cs20.10.9.3-1+deb12u2
- from 0, < 5.26.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | LOW3.9 | CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L |