Announcing Istio 1.4.2

This release contains fixes for the security vulnerability described in our December 10th, 2019 news post. This release note describes what’s different between Istio 1.4.1 and Istio 1.4.2.

Security update

• ISTIO-SECURITY-2019-007 A heap overflow and improper input validation have been discovered in Envoy.

CVE-2019-18801: Fix a vulnerability affecting Envoy’s processing of large HTTP/2 request headers. A successful exploitation of this vulnerability could lead to a denial of service, escalation of privileges, or information disclosure. CVE-2019-18802: Fix a vulnerability resulting from whitespace after HTTP/1 header values which could allow an attacker to bypass Istio’s policy checks, potentially resulting in information disclosure or escalation of privileges. CVE-2019-18838: Fix a vulnerability resulting from malformed HTTP request missing the “Host” header. An encoder filter that invokes Envoy’s route manager APIs that access request’s “Host” header will cause a NULL pointer to be dereferenced and result in abnormal termination of the Envoy process.