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githubGitHub Advisory DatabaseGHSA-WQQ4-5WPV-MX2G
HistoryOct 16, 2023 - 2:05 p.m.

Undici's cookie header not cleared on cross-origin redirect in fetch

2023-10-1614:05:37
CWE-200
GitHub Advisory Database
github.com
17
undici
cross-origin
redirect
cookie
leakage
patched
version 5.26.2
vulnerability

3.9 Low

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

HIGH

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

LOW

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L

0.009 Low

EPSS

Percentile

82.4%

Impact

Undici clears Authorization headers on cross-origin redirects, but does 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 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, which is included in version 5.26.2.

Affected configurations

Vulners
Node
github_advisory_databaseundiciRange<5.26.2
CPENameOperatorVersion
undicilt5.26.2

References

3.9 Low

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

HIGH

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

LOW

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L

0.009 Low

EPSS

Percentile

82.4%