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Authentication Bypass Affecting istio.io/istio/pilot/pkg/security/authz/matcher package, versions >=1.11.0 <1.11.1 >=1.10.0 <1.10.4 <1.9.8

0.0
high

  • Attack Complexity

    Low

  • User Interaction

    Required

  • Confidentiality

    High

  • Integrity

    High

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  • snyk-id

    SNYK-GOLANG-ISTIOIOISTIOPILOTPKGSECURITYAUTHZMATCHER-1569602

  • published

    25 Aug 2021

  • disclosed

    25 Aug 2021

  • credit

    Yangmin Zhu of Google

Report a new vulnerability Found a mistake?

Introduced: 25 Aug 2021

CVE-2021-39156 Open this link in a new tab
CWE-287 Open this link in a new tab

How to fix?

Upgrade istio.io/istio/pilot/pkg/security/authz/matcher to version 1.11.1, 1.10.4, 1.9.8 or higher.

Overview

istio.io/istio/pilot/pkg/security/authz/matcher is an An open platform to connect, manage, and secure microservices.

Affected versions of this package are vulnerable to Authentication Bypass. An HTTP request with a fragment in the URI path (a section in the URI that begins with a # character) could bypass Istio’s URI path-based authorization policies. For instance, an Istio authorization policy may deny requests sent to the URI path /user/profile. In the vulnerable versions, a request with URI path /user/profile#section1 bypasses the deny policy and routes to the backend (with the normalized URI path /user/profile%23section1), possibly leading to a security incident.

You are impacted by this vulnerability if you use authorization policies with DENY actions and operation.paths, or ALLOW actions and operation.notPaths.

The fix depends on a fix in Envoy, which is associated with CVE-2021-32779.