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
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25 Aug 2021
25 Aug 2021
Yangmin Zhu of Google
How to fix?
istio.io/istio/pilot/pkg/security/authz/matcher to version 1.11.1, 1.10.4, 1.9.8 or higher.
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
The fix depends on a fix in Envoy, which is associated with CVE-2021-32779.