In Istio 1.5.0 though 1.5.8 and Istio 1.6.0 through 1.6.7, when users specify an AuthorizationPolicy resource with DENY actions using wildcard suffixes (e.g. *-some-suffix) for source principals or namespace fields, callers will never be denied access, bypassing the intended policy.
istio.io/istio/pilot/pkg/security/authz/model/matcher
{
"nvd_published_at": null,
"cwe_ids": [
"CWE-284"
],
"severity": "MODERATE",
"github_reviewed": true,
"github_reviewed_at": "2021-05-12T21:59:07Z"
}