Authorization Bypass Affecting package, versions >=1.11.0 <1.11.1 >=1.10.0 <1.10.4 <1.9.8

  • Attack Complexity


  • User Interaction


  • Confidentiality


  • Integrity


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  • snyk-id


  • published

    25 Aug 2021

  • disclosed

    25 Aug 2021

  • credit

    Yangmin Zhu of Google

How to fix?

Upgrade to version 1.11.1, 1.10.4, 1.9.8 or higher.

Overview is an An open platform to connect, manage, and secure microservices.

Affected versions of this package are vulnerable to Authorization Bypass. According to RFC 4343, Istio authorization policy should compare the hostname in the HTTP Host header in a case insensitive way, but currently the comparison is case sensitive. An HTTP request could potentially bypass an Istio authorization policy when using rules based on hosts or notHosts.

For example, the user could have an authorization policy that rejects requests with host, but the attacker can bypass this by sending the request with hostname The routing flow routes the traffic to the backend for which is a policy violation.