Detections
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RHCOS 4 : OpenShift Container Platform 4.9.0 (RHSA-2021:3758)

medium Nessus Plugin ID 312566

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Synopsis

The remote Red Hat CoreOS host is missing one or more security updates for OpenShift Container Platform 4.9.0.

Description

The remote Red Hat Enterprise Linux CoreOS 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:3758 advisory.

 - coreos-installer: restrict access permissions on /boot/ignition{,/config.ign} (CVE-2021-3917)

 - jetty: requests to the ConcatServlet and WelcomeFilter are able to access protected resources within the WEB-INF directory (CVE-2021-28169)

 - golang: archive/zip: malformed archive may cause panic or memory exhaustion (CVE-2021-33196)

 - jetty: SessionListener can prevent a session from being invalidated breaking logout (CVE-2021-34428)

 - openvswitch: use-after-free in decode_NXAST_RAW_ENCAP during the decoding of a RAW_ENCAP action (CVE-2021-36980)

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

Solution

Update the RHCOS OpenShift Container Platform 4.9.0 packages based on the guidance in RHSA-2021:3758.

See Also

https://access.redhat.com/security/updates/classification/#moderate

https://bugzilla.redhat.com/show_bug.cgi?id=1965503

https://bugzilla.redhat.com/show_bug.cgi?id=1971016

https://bugzilla.redhat.com/show_bug.cgi?id=1974891

https://bugzilla.redhat.com/show_bug.cgi?id=1984473

http://www.nessus.org/u?ed8dcce3

https://access.redhat.com/errata/RHSA-2021:3758

Plugin Details

Severity: Medium

ID: 312566

File Name: rhcos-RHSA-2021-3758.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 5/6/2026

Updated: 5/6/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

Vendor

Vendor Severity: Moderate

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS Score Source: CVE-2021-28169

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS Score Source: CVE-2021-3917

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:jenkins, p-cpe:/a:redhat:enterprise_linux:openshift, p-cpe:/a:redhat:enterprise_linux:openshift-hyperkube, p-cpe:/a:redhat:enterprise_linux:coreos-installer, p-cpe:/a:redhat:enterprise_linux:coreos-installer-bootinfra, p-cpe:/a:redhat:enterprise_linux:openvswitch2.15, p-cpe:/a:redhat:enterprise_linux:network-scripts-openvswitch2.15, p-cpe:/a:redhat:enterprise_linux:openvswitch2.15-devel, p-cpe:/a:redhat:enterprise_linux:openvswitch2.15-ipsec, p-cpe:/a:redhat:enterprise_linux:openvswitch2.15-test, p-cpe:/a:redhat:enterprise_linux:python3-openvswitch2.15, cpe:/o:redhat:enterprise_linux:8:coreos, cpe:/o:redhat:enterprise_linux:7:coreos

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/18/2021

Vulnerability Publication Date: 6/9/2021

Reference Information

CVE: CVE-2021-28169, CVE-2021-33196, CVE-2021-34428, CVE-2021-36980, CVE-2021-3917

CWE: 200, 276, 400, 416, 613

RHSA: 2021:3758