RHEL 8 : varnish:6 (RHSA-2020:4756)

high Nessus Plugin ID 142443

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Synopsis

The remote Red Hat host is missing one or more security updates.

Description

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:4756 advisory.

Varnish Cache is a high-performance HTTP accelerator. It stores web pages in memory so web servers don't have to create the same web page over and over again, giving the website a significant speed up.

The following packages have been upgraded to a later upstream version: varnish (6.0.6). (BZ#1795673)

Security Fix(es):

* varnish: denial of service handling certain crafted HTTP/1 requests (CVE-2019-15892)

* varnish: remote clients may cause Varnish to assert and restart which could result in DoS (CVE-2020-11653)

* varnish: not clearing pointer between two client requests leads to information disclosure (CVE-2019-20637)

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.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.3 Release Notes linked from 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.

Solution

Update the affected packages.

Plugin Details

Severity: High

ID: 142443

File Name: redhat-RHSA-2020-4756.nasl

Version: 1.12

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 11/4/2020

Updated: 3/15/2025

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.18

Vendor

Vendor Severity: Moderate

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2019-20637

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:8, p-cpe:/a:redhat:enterprise_linux:varnish, p-cpe:/a:redhat:enterprise_linux:varnish-devel, p-cpe:/a:redhat:enterprise_linux:varnish-docs, p-cpe:/a:redhat:enterprise_linux:varnish-modules

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

Exploit Ease: No known exploits are available

Patch Publication Date: 11/4/2020

Vulnerability Publication Date: 9/3/2019

Reference Information

CVE: CVE-2019-15892, CVE-2019-20637, CVE-2020-11653

CWE: 20, 200, 400

RHSA: 2020:4756

Detections

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