Incorrect access control.

May 28, 2019

Disclosure Details
CVSS Impact Score8.9 CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N/E:H/RL:O/RC:C
Affected Releases1.1 to 1.1.6

During review of the Istio 1.1.7 release notes, we realized that issue 13868, which is fixed in the release, actually represents a security vulnerability.

Initially we thought the bug was impacting the TCP Authorization feature advertised as alpha stability, which would not have required invoking this security advisory process, but we later realized that the Deny Checker and List Checker feature were affected and those are considered stable features. We are revisiting our processes to flag vulnerabilities that are initially reported as bugs instead of through the private disclosure process.

We tracked the bug to a code change introduced in Istio 1.1 and affecting all releases up to 1.1.6.

Impact and detection

Since Istio 1.1, In the default Istio installation profile, policy enforcement is disabled by default.

You can check the status of policy enforcement for your mesh with the following command:

$ kubectl -n istio-system get cm istio -o jsonpath="{}" | grep disablePolicyChecks
disablePolicyChecks: true

You are not impacted by this vulnerability if disablePolicyChecks is set to true.

You are impacted by the vulnerability issue if the following conditions are all true:



The Istio team would like to thank Haim Helman for the original bug report.

Reporting vulnerabilities

We’d like to remind our community to follow the vulnerability reporting process to report any bug that can result in a security vulnerability.