CVE-2018-25091: Authorization Header forwarded on redirect

October 15, 2023 (updated October 17, 2023)

urllib3 before 1.24.2 does not remove the authorization HTTP header when following a cross-origin redirect (i.e., a redirect that differs in host, port, or scheme). This can allow for credentials in the authorization header to be exposed to unintended hosts or transmitted in cleartext. NOTE: this issue exists because of an incomplete fix for CVE-2018-20060 (which was case-sensitive).

References

github.com/advisories/GHSA-gwvm-45gx-3cf8
github.com/urllib3/urllib3/commit/adb358f8e06865406d1f05e581a16cbea2136fbc
github.com/urllib3/urllib3/compare/1.24.1...1.24.2
github.com/urllib3/urllib3/issues/1510
nvd.nist.gov/vuln/detail/CVE-2018-25091

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