RHSA-2020_0477

Vulnerability from csaf_redhat - Published: 2020-02-12 06:39 - Updated: 2024-11-22 14:26
Summary
Red Hat Security Advisory: Red Hat OpenShift Service Mesh 1.0.7 servicemesh-proxy security update
Severity
Important
Notes
Topic: Red Hat OpenShift Service Mesh 1.0.7. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Red Hat OpenShift Service Mesh is Red Hat's distribution of the Istio service mesh project, tailored for installation into an on-premise OpenShift Container Platform installation. This advisory covers the RPM packages for the OpenShift Service Mesh 1.0.7 release. Security Fix(es): * istio: unauthorised access to JWT protected HTTP path (CVE-2020-8595) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2020-8595

An unauthorized access vulnerability was found in Istio in the servicemesh-proxy. An attacker can use this flaw to specify an HTTP path and gain unauthorized access, even if the path is configured to only be accessed with a valid JSON Web Token (JWT).

7.3 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CWE-285 - Improper Authorization
Vendor Fix The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/4.3/service_mesh/servicemesh-release-notes.html https://access.redhat.com/errata/RHSA-2020:0477
Workaround Depending on the paths used in the exact match clause, it is possible to update the path to a regex. As provided by the Istio Product Committee, the following mitigation can be employed. The original policy specifying a JWT protected path is as follows: --- apiVersion: "authentication.istio.io/v1alpha1" kind: "Policy" metadata: name: "jwt-example" namespace: istio-system spec: targets: - name: istio-ingressgateway origins: - jwt: issuer: "testing@secure.istio.io" jwksUri: "https://raw.githubusercontent.com/istio/istio/release-1.4/security/tools/jwt/samples/jwks.json" trigger_rules: - included_paths: - exact: /productpage The exact path definition can then be updated to a regular expression: --- - jwt: issuer: "testing@secure.istio.io" jwksUri: "https://raw.githubusercontent.com/istio/istio/release-1.4/security/tools/jwt/samples/jwks.json" trigger_rules: - included_paths: - regex: '/productpage(\?.*)?' - regex: '/productpage(#.*)?'
References
Acknowledgments
The Istio Product Security Committee
To clipboard 

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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