Authentication Bypass Affecting istio.io/istio/pilot/pkg/security/authz/matcher Open this link in a new tab package, versions >=1.11.0 <1.11.1 >=1.10.0 <1.10.4 <1.9.8
Attack Complexity
Low
User Interaction
Required
Confidentiality
High
Integrity
High
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snyk-id
SNYK-GOLANG-ISTIOIOISTIOPILOTPKGSECURITYAUTHZMATCHER-1569602
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published
25 Aug 2021
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disclosed
25 Aug 2021
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credit
Yangmin Zhu of Google
Introduced: 25 Aug 2021
CVE-2021-39156 Open this link in a new tabHow 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.