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Red Hat v7: RHSA-2021-2993-01 Important: Varnish Cache HTTP/2 Attack

red hat
Calendar Grey August 3, 2021
Dist Redhat Esm H88
A crucial security patch for rh-varnish6 has been released, focusing on a significant HTTP/2 vulnerability. Essential update information is outlined herein.
An update for rh-varnish6-varnish is now available for Red Hat Software Collections

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Summary

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: rh-varnish6-varnish (6.0.8).
Security Fix(es):
* varnish: HTTP/2 request smuggling attack via a large Content-Length header for a POST request (CVE-2021-36740)
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.

Topics%20covered

Topics Covered

security advisory security update Red Hat important software collection Varnish Cache HTTP/2 attack

References

https://access.redhat.com/security/cve/CVE-2021-36740 https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7):
Source: rh-varnish6-varnish-6.0.8-2.el7.src.rpm rh-varnish6-varnish-modules-0.15.0-7.el7.src.rpm
ppc64le: rh-varnish6-varnish-6.0.8-2.el7.ppc64le.rpm rh-varnish6-varnish-devel-6.0.8-2.el7.ppc64le.rpm rh-varnish6-varnish-docs-6.0.8-2.el7.ppc64le.rpm rh-varnish6-varnish-libs-6.0.8-2.el7.ppc64le.rpm rh-varnish6-varnish-modules-0.15.0-7.el7.ppc64le.rpm rh-varnish6-varnish-modules-debuginfo-0.15.0-7.el7.ppc64le.rpm
s390x: rh-varnish6-varnish-6.0.8-2.el7.s390x.rpm rh-varnish6-varnish-devel-6.0.8-2.el7.s390x.rpm rh-varnish6-varnish-docs-6.0.8-2.el7.s390x.rpm rh-varnish6-varnish-libs-6.0.8-2.el7.s390x.rpm rh-varnish6-varnish-modules-0.15.0-7.el7.s390x.rpm rh-varnish6-varnish-modules-debuginfo-0.15.0-7.el7.s390x.rpm
x86_64: rh-varnish6-varnish-6.0.8-2.el7.x86_64.rpm rh-varnish6-varnish-devel-6.0.8-2.el7.x86_64.rpm rh-varnish6-varnish-docs-6.0.8-2.el7.x86_64.rpm rh-varnish6-varnish-libs-6.0.8-2.el7.x86_64.rpm rh-varnish6-varnish-modules-0.15.0-7.el7.x86_64.rpm rh-varnish6-varnish-modules-debuginfo-0.15.0-7.el7.x86_64.rpm
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7):
Source: rh-varnish6-varnish-6.0.8-2.el7.src.rpm rh-varnish6-varnish-modules-0.15.0-7.el7.src.rpm
ppc64le:

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:2993-01
Product: Red Hat Software Collections
Advisory URL: https://access.redhat.com/errata/RHSA-2021:2993
Issue date: 2021-08-03

Topic

An update for rh-varnish6-varnish is now available for Red Hat SoftwareCollections.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory security update Red Hat important software collection Varnish Cache HTTP/2 attack

Relevant Releases Architectures

Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) - ppc64le, s390x, x86_64

Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) - ppc64le, s390x, x86_64

Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) - x86_64

Bugs Fixed

1982409 - CVE-2021-36740 varnish: HTTP/2 request smuggling attack via a large Content-Length header for a POST request

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