An issue was discovered in Envoy 1.12.0. Upon receipt of a malformed HTTP request without a Host header, it sends an internally generated "Invalid request" response. This internally generated response is dispatched through the configured encoder filter chain before being sent to the client. An encoder filter that invokes route manager APIs that access a request's Host header causes a NULL pointer dereference, resulting in abnormal termination of the Envoy process.

An update of the envoy package has been released.

The remote Redhat Enterprise Linux 7 / 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2019:4222 advisory.

    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 1.0.3 release.

    Security Fix(es):

    * An untrusted remote client may send HTTP/2 requests that write to the heap outside of the request     buffers when the upstream is HTTP/1 (CVE-2019-18801)

    * Malformed request header may cause bypass of route matchers resulting in escalation of privileges or     information disclosure (CVE-2019-18802)

    * Malformed HTTP request without the Host header may cause abnormal termination of the Envoy process     (CVE-2019-18838)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
136105	Photon OS 1.0: Envoy PHSA-2020-1.0-0290	Nessus	PhotonOS Local Security Checks	Local	medium
135867	Photon OS 2.0: Envoy PHSA-2020-2.0-0229	Nessus	PhotonOS Local Security Checks	Local	medium
132031	RHEL 7 / 8 : Red Hat OpenShift Service Mesh 1.0.3 RPMs (RHSA-2019:4222)	Nessus	Red Hat Local Security Checks	Local	critical

Detections

Analytics

CVE-2019-18838

high

Tenable Plugins

medium

medium

critical