Istio before 1.8.6 and 1.9.x before 1.9.5 has a remotely exploitable vulnerability where an HTTP request path with multiple slashes or escaped slash characters (%2F or %5C) could potentially bypass an Istio authorization policy when path based authorization rules are used.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Istio before 1.8.6 and 1.9.x before 1.9.5 has a remotely exploitable vulnerability where an HTTP request
    path with multiple slashes or escaped slash characters (%2F or %5C) could potentially bypass an Istio
    authorization policy when path based authorization rules are used. (CVE-2021-31920)

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-9398 advisory.

    - Address Istio CVE's CVE-2021-28683, CVE-2021-28682, CVE-2021-29258, CVE-2021-31920, CVE-2021-31921,     CVE-2021-34824
    - Address CVE-2021-28683, CVE-2021-28682, CVE-2021-29258, CVE-2021-31920, CVE-2021-31921, CVE-2021-34824

    istio

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-2021-9397 advisory.

    - Address Istio CVE's CVE-2021-28683, CVE-2021-28682, CVE-2021-29258, CVE-2021-31920, CVE-2021-31921,     CVE-2021-34824

    istio
    - Address CVE-2021-28683, CVE-2021-28682, CVE-2021-29258, CVE-2021-31920, CVE-2021-31921, CVE-2021-34824

    kubernetes

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-2021-9399 advisory.

    - Address Istio CVE's CVE-2021-28683, CVE-2021-28682, CVE-2021-29258, CVE-2021-31920, CVE-2021-31921,     CVE-2021-34824
    - Address CVE-2021-28683, CVE-2021-28682, CVE-2021-29258, CVE-2021-31920, CVE-2021-31921, CVE-2021-34824

    istio

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 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-9396 advisory.

    - Address Istio CVE's CVE-2021-28683, CVE-2021-28682, CVE-2021-29258, CVE-2021-31920, CVE-2021-31921,     CVE-2021-34824

    istio
    - Address CVE-2021-28683, CVE-2021-28682, CVE-2021-29258, CVE-2021-31920, CVE-2021-31921, CVE-2021-34824

    kubernetes

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-2021:1540 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 escaped slash characters can bypass Envoy's authorization mechanisms     (CVE-2021-29492)

    * istio/istio: HTTP request with escaped slash characters can bypass authorization mechanisms     (CVE-2021-31920)

    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-2021:1538 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 escaped slash characters can bypass Envoy's authorization mechanisms     (CVE-2021-29492)

    * istio/istio: HTTP request with escaped slash characters can bypass authorization mechanisms     (CVE-2021-31920)

    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
433422	SCA: security update for istio.io/istio (GHSA-6q5m-22mq-q2xv)	Tenable Cloud Security	SCA Checks	medium
433422	SCA: security update for istio.io/istio (GHSA-6q5m-22mq-q2xv)	Tenable Self-Hosted Container Security	SCA Checks	medium
152268	Oracle Linux 8 : olcne (ELSA-2021-9398)	Nessus	Oracle Linux Local Security Checks	critical
152267	Oracle Linux 7 : olcne (ELSA-2021-9397)	Nessus	Oracle Linux Local Security Checks	critical
152266	Oracle Linux 7 : olcne (ELSA-2021-9399)	Nessus	Oracle Linux Local Security Checks	critical
152265	Oracle Linux 8 : olcne (ELSA-2021-9396)	Nessus	Oracle Linux Local Security Checks	critical
149445	RHEL 8 : Red Hat OpenShift Service Mesh 1.1.14 (RHSA-2021:1540)	Nessus	Red Hat Local Security Checks	high
149435	RHEL 8 : Red Hat OpenShift Service Mesh 2.0.4 (RHSA-2021:1538)	Nessus	Red Hat Local Security Checks	high

Detections

Analytics

CVE-2021-31920

medium

Tenable Plugins

medium

medium

critical

critical

critical

critical

high

high