In Envoy before versions 1.12.6, 1.13.4, 1.14.4, and 1.15.0 when validating TLS certificates, Envoy would incorrectly allow a wildcard DNS Subject Alternative Name apply to multiple subdomains. For example, with a SAN of *.example.com, Envoy would incorrectly allow nested.subdomain.example.com, when it should only allow subdomain.example.com. This defect applies to both validating a client TLS certificate in mTLS, and validating a server TLS certificate for upstream connections. This vulnerability is only applicable to situations where an untrusted entity can obtain a signed wildcard TLS certificate for a domain of which you only intend to trust a subdomain of. For example, if you intend to trust api.mysubdomain.example.com, and an untrusted actor can obtain a signed TLS certificate for *.example.com or *.com. Configurations are vulnerable if they use verify_subject_alt_name in any Envoy version, or if they use match_subject_alt_names in version 1.14 or later. This issue has been fixed in Envoy versions 1.12.6, 1.13.4, 1.14.4, 1.15.0.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2020-5765 advisory.

    - x86/speculation: Add SRBDS vulnerability and mitigation documentation (Mark Gross)  [Orabug: 31446720]     {CVE-2020-0543}
    - x86/speculation: Add Special Register Buffer Data Sampling (SRBDS) mitigation (Mark Gross)  [Orabug:
    31446720]  {CVE-2020-0543}
    - x86/cpu: Add 'table' argument to cpu_matches() (Mark Gross)  [Orabug: 31446720]  {CVE-2020-0543}
    - x86/cpu: Add a steppings field to struct x86_cpu_id (Mark Gross)  [Orabug: 31446720]  {CVE-2020-0543}
    - Address Kata CVE-2020-2023
    - Address Kata CVE-2020-2024
    - Address Kata CVE-2020-2025
    - Address Kata CVE-2020-2026

    kata
    - Address CVE-2020-2023
    - Address CVE-2020-2024
    - Address CVE-2020-2025
    - Address CVE-2020-2026

    kubernetes
    - CVE-2020-8559: Privilege escalation from compromised node to cluster
    - CVE-2020-8557: Node disk DOS by writing to container /etc/hosts
    - Update dependency on Kata containers to a build that includes fixes for CVE-2020-2023 thru CVE-2020-2026

    kubernetes
    - CVE-2020-15104:
      Incorrect validation of wildcard DNS Subject Alternative Names
    - CVE-2020-8559: Privilege escalation from compromised node to cluster
    - CVE-2020-8557: Node disk DOS by writing to container /etc/hosts
    - Update Kubernetes to use Kata 1.7.3-1.0.7 to address CVE-2020-2023 thru CVE-2020-2026

Tenable has extracted the preceding description block directly from the Oracle 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.

An update of the envoy package has been released.

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2020:3090 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.

    Security Fix(es):

    * envoyproxy/envoy: incorrectly validates TLS certificates when using wildcards for DNS SAN's     (CVE-2020-15104)

    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 this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
180974	Oracle Linux 7 : Unbreakable Enterprise kernel-container kata-image kata-runtime kata kubernetes kubernetes istio olcne (ELSA-2020-5765)	Nessus	Oracle Linux Local Security Checks	high
140713	Photon OS 2.0: Envoy PHSA-2020-2.0-0285	Nessus	PhotonOS Local Security Checks	medium
138843	RHEL 8 : Red Hat OpenShift Service Mesh 1.1 servicemesh-proxy (RHSA-2020:3090)	Nessus	Red Hat Local Security Checks	medium

Detections

Analytics

CVE-2020-15104

medium

Tenable Plugins

high

medium

medium