Regression in JWT Signature Validation
CVE-2020-15240

7.4HIGH

Key Information:

Vendor

Auth0

Status
Omniauth-auth0
Vendor
CVE Published:
21 October 2020

What is CVE-2020-15240?

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.

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Affected Version(s)

omniauth-auth0 >= 2.3.0, <2.4.1

References

https://github.com/auth0/omniauth-auth0/security/advisori...
x_refsource_CONFIRM
https://github.com/auth0/omniauth-auth0/commit/fd3a14f4cc...
x_refsource_MISC
https://rubygems.org/gems/omniauth-auth0
x_refsource_MISC

CVSS V3.1

Score:
7.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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