Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS14aHc2LWhqYzktNjc5bc0hGg

Pac4j token validation bypass if OpenID Connect provider supports none algorithm

If an OpenID Connect provider supports the “none” algorithm (i.e., tokens with no signature), pac4j v5.3.0 (and prior) does not refuse it without an explicit configuration on its side or for the “idtoken” response type which is not secure and violates the OpenID Core Specification. The "none" algorithm does not require any signature verification when validating the ID tokens, which allows the attacker to bypass the token validation by injecting a malformed ID token using "none" as the value of "alg" key in the header with an empty signature value.

Permalink: https://github.com/advisories/GHSA-xhw6-hjc9-679m
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS14aHc2LWhqYzktNjc5bc0hGg
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: over 2 years ago
Updated: 7 months ago

CVSS Score: 7.5
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Identifiers: GHSA-xhw6-hjc9-679m, CVE-2021-44878
References:

• https://nvd.nist.gov/vuln/detail/CVE-2021-44878
• https://github.com/pac4j/pac4j/commit/22b82ffd702a132d9f09da60362fc6264fc281ae
• https://openid.net/specs/openid-connect-core-1_0.html#IDToken
• https://www.pac4j.org/blog/cve_2021_44878_is_this_serious.html
• https://github.com/pac4j/pac4j/commit/09684e0de1c4753d22c53b8135d4ef61cfda76f7
• https://github.com/pac4j/pac4j/commit/9c87bbc536ed5d05f940ae015403120df2935589
• https://www.pac4j.org/4.5.x/docs/release-notes.html
• https://github.com/advisories/GHSA-xhw6-hjc9-679m

Repository: https://github.com/pac4j/pac4j
Blast Radius: 17.8

Affected Packages