by Kastro
Paper/Archive/CVE-2020-15240

CVE-2020-15240

auth0 omniauth-auth0 — Regression in JWT Signature Validation

EPSS 0.8%CVSS 9.1
critical.is priorityof 100
39
CVSS 9.1 (NVD)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 56.7.567 × 2011.3No public exploit+100.0SSVC exploitation: unknown+100.0
Description · from the CVE record

omniauth-auth0 (rubygems) versions >= 2.3.0 and < 2.4.1 improperly validate the JWT token signature when using the `jwt_validator.verify` method. Improper validation of the JWT token signature can allow an attacker to bypass authentication and authorization. You are affected by this vulnerability if all of the following conditions apply: 1. You are using `omniauth-auth0`. 2. You are using `JWTValidator.verify` method directly OR you are not authenticating using the SDK’s default Authorization Code Flow. The issue is patched in version 2.4.1.

Affected

ProductAffectedFixed inSource
omniauth-auth0>= 2.3.0, <2.4.1–CNA

Scores by source

NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
GitHub_M (CNA)7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References

refgithub.com/auth0/omniauth-auth0/security/advisories/GHSA-58r4-h6v8-jcvmrefgithub.com/auth0/omniauth-auth0/commit/fd3a14f4ccdfbc515d1121d6378ff88bf55a7a7arefrubygems.org/gems/omniauth-auth0