Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions when ext-authz extension is sending request headers to the external authorization service it must merge multiple value headers according to the HTTP spec. However, only the last header value is sent. This may allow specifically crafted requests to bypass authorization. Attackers may be able to escalate privileges when using ext-authz extension or back end service that uses multiple value headers for authorization. A specifically constructed request may be delivered by an untrusted downstream peer in the presence of ext-authz extension. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to the ext-authz extension to correctly merge multiple request header values, when sending request for authorization.

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-9546 advisory.

    - Update Kubernetes version to 1.20.11 to address CVE-2021-25741
    - Update Istio to 1.9.8, 1.10.4 to address CVE-2021-32777, CVE-2021-32778, CVE-2021-32779, CVE-2021-32780     & CVE-2021-32781
    - Bump release, addresses the following envoy CVEs,       CVE-2021-32777, CVE-2021-32778, CVE-2021-32779, CVE-2021-32780 & CVE-2021-32781
    - Bump release, addresses the following envoy CVEs,       CVE-2021-32777, CVE-2021-32778, CVE-2021-32779, CVE-2021-32780 & CVE-2021-32781
    - Bump release for CVE fix, addresses CVE-2021-25741

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.

The remote Oracle Linux 7 / 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-9525 advisory.

    - Update Istio to 1.9.8 to address CVE-2021-32777, CVE-2021-32778, CVE-2021-32779, CVE-2021-32780 &     CVE-2021-32781
    - Bump release, addresses the following envoy CVEs,       CVE-2021-32777, CVE-2021-32778, CVE-2021-32779, CVE-2021-32780 & CVE-2021-32781

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.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-9526 advisory.

    - Update Kubernetes version to 1.20.11 to address CVE-2021-25741
    - Update Istio to 1.9.8, 1.10.4 to address CVE-2021-32777, CVE-2021-32778, CVE-2021-32779, CVE-2021-32780     & CVE-2021-32781
    - Bump release, addresses the following envoy CVEs,       CVE-2021-32777, CVE-2021-32778, CVE-2021-32779, CVE-2021-32780 & CVE-2021-32781
    - Bump release, addresses the following envoy CVEs,       CVE-2021-32777, CVE-2021-32778, CVE-2021-32779, CVE-2021-32780 & CVE-2021-32781
    - Bump release for CVE fix, addresses CVE-2021-25741

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.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:3273 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: HTTP request with multiple value headers can bypass authorization policies     (CVE-2021-32777)

    * envoyproxy/envoy: HTTP request with a URL fragment in the URI can bypass authorization policies     (CVE-2021-32779)

    * envoyproxy/envoy: denial of service when using extensions that modify request or response sizes     (CVE-2021-32781)

    * istio/istio: HTTP request can bypass authorization mechanisms due to case insensitive host comparison     (CVE-2021-39155)

    * istio/istio: HTTP request with fragment in URI can bypass authorization mechanisms (CVE-2021-39156)

    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.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:3272 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: HTTP request with multiple value headers can bypass authorization policies     (CVE-2021-32777)

    * envoyproxy/envoy: HTTP request with a URL fragment in the URI can bypass authorization policies     (CVE-2021-32779)

    * envoyproxy/envoy: denial of service when using extensions that modify request or response sizes     (CVE-2021-32781)

    * istio/istio: HTTP request can bypass authorization mechanisms due to case insensitive host comparison     (CVE-2021-39155)

    * istio/istio: HTTP request with fragment in URI can bypass authorization mechanisms (CVE-2021-39156)

    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	Severity
155011	Oracle Linux 8 : olcne / istio / istio / kubernetes (ELSA-2021-9546)	Nessus	Oracle Linux Local Security Checks	high
154971	Oracle Linux 7 / 8 : olcne (ELSA-2021-9525)	Nessus	Oracle Linux Local Security Checks	high
154970	Oracle Linux 7 : olcne (ELSA-2021-9526)	Nessus	Oracle Linux Local Security Checks	high
152829	RHEL 8 : Red Hat OpenShift Service Mesh 1.1.17.1 (RHSA-2021:3273)	Nessus	Red Hat Local Security Checks	high
152828	RHEL 8 : Red Hat OpenShift Service Mesh 2.0.7.1 (RHSA-2021:3272)	Nessus	Red Hat Local Security Checks	high

Detections

Analytics

CVE-2021-32777

high

Tenable Plugins

high

high

high

high

high