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Access Restriction Bypass Affecting github.com/dgrijalva/jwt-go package, versions <4.0.0-preview1

0.0
high

Snyk CVSS

    Attack Complexity Low
    Confidentiality High

    Threat Intelligence

    EPSS 0.19% (57th percentile)
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NVD
7.5 high
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Red Hat
7.5 high

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  • Snyk ID SNYK-GOLANG-GITHUBCOMDGRIJALVAJWTGO-596515
  • published 13 Sep 2020
  • disclosed 30 Jul 2020
  • credit christopher-wong
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Introduced: 30 Jul 2020

CVE-2020-26160 Open this link in a new tab
CWE-287 Open this link in a new tab

How to fix?

Upgrade github.com/dgrijalva/jwt-go to version 4.0.0-preview1 or higher.

Overview

github.com/dgrijalva/jwt-go is a go implementation of JSON Web Tokens.

Affected versions of this package are vulnerable to Access Restriction Bypass if m["aud"] happens to be []string{}, as allowed by the spec, the type assertion fails and the value of aud is "". This can cause audience verification to succeed even if the audiences being passed are incorrect if required is set to false.

References