RHCOS 4 : OpenShift Container Platform 4.8.9 (RHSA-2021:3248)

high Nessus Plugin ID 312406

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Synopsis

The remote Red Hat CoreOS host is missing one or more security updates for OpenShift Container Platform 4.8.9.

Description

The remote Red Hat Enterprise Linux CoreOS 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:3248 advisory.

- golang: net/http: panic in ReadRequest and ReadResponse when reading a very large header (CVE-2021-31525)

- golang: net: lookup functions may return invalid host names (CVE-2021-33195)

- golang: net/http/httputil: ReverseProxy forwards connection headers if first one is empty (CVE-2021-33197)

- golang: math/big.Rat: may cause a panic or an unrecoverable fatal error if passed inputs with very large exponents (CVE-2021-33198)

- golang: crypto/tls: certificate of wrong type is causing TLS client to panic (CVE-2021-34558)

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 4.8.9 packages based on the guidance in RHSA-2021:3248.

Plugin Details

Severity: High

ID: 312406

File Name: rhcos-RHSA-2021-3248.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

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: High

Base Score: 7.5

Temporal Score: 5.9

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

CVSS Score Source: CVE-2021-33195

CVSS v3

Risk Factor: High

Base Score: 7.3

Temporal Score: 6.6

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

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

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:containernetworking-plugins, p-cpe:/a:redhat:enterprise_linux:golang-github-prometheus-promu, p-cpe:/a:redhat:enterprise_linux:prometheus-promu, p-cpe:/a:redhat:enterprise_linux:cri-tools, 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: 8/31/2021

Vulnerability Publication Date: 5/27/2021

Reference Information

CVE: CVE-2021-31525, CVE-2021-33195, CVE-2021-33197, CVE-2021-33198, CVE-2021-34558

CWE: 120, 20, 400

RHSA: 2021:3248

Detections

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