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Red Hat: RHSA-2021-2988-01 Important: Varnish HTTP/2 Attack

red hat
Calendar Grey August 2, 2021
Dist Redhat Esm H88
Uncover the critical security patch for varnish:6 tackling CVE-2021-36740 within Red Hat Enterprise Linux.
An update for the varnish:6 module is now available for Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 8.1 Extended Update Support, and Red Hat Enterprise Linux 8.2 Extended ...

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.
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 Red Hat attack important update varnish HTTP/2

References

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

Package List

Red Hat Enterprise Linux AppStream EUS (v. 8.1):
Source: varnish-6.0.2-2.module+el8.1.0+11974+ea5ba4f1.src.rpm varnish-modules-0.15.0-4.module+el8+2481+4078e9d2.src.rpm
aarch64: varnish-6.0.2-2.module+el8.1.0+11974+ea5ba4f1.aarch64.rpm varnish-devel-6.0.2-2.module+el8.1.0+11974+ea5ba4f1.aarch64.rpm varnish-docs-6.0.2-2.module+el8.1.0+11974+ea5ba4f1.aarch64.rpm varnish-modules-0.15.0-4.module+el8+2481+4078e9d2.aarch64.rpm varnish-modules-debuginfo-0.15.0-4.module+el8+2481+4078e9d2.aarch64.rpm varnish-modules-debugsource-0.15.0-4.module+el8+2481+4078e9d2.aarch64.rpm
ppc64le: varnish-6.0.2-2.module+el8.1.0+11974+ea5ba4f1.ppc64le.rpm varnish-devel-6.0.2-2.module+el8.1.0+11974+ea5ba4f1.ppc64le.rpm varnish-docs-6.0.2-2.module+el8.1.0+11974+ea5ba4f1.ppc64le.rpm varnish-modules-0.15.0-4.module+el8+2481+4078e9d2.ppc64le.rpm varnish-modules-debuginfo-0.15.0-4.module+el8+2481+4078e9d2.ppc64le.rpm varnish-modules-debugsource-0.15.0-4.module+el8+2481+4078e9d2.ppc64le.rpm
s390x: varnish-6.0.2-2.module+el8.1.0+11974+ea5ba4f1.s390x.rpm varnish-devel-6.0.2-2.module+el8.1.0+11974+ea5ba4f1.s390x.rpm varnish-docs-6.0.2-2.module+el8.1.0+11974+ea5ba4f1.s390x.rpm varnish-modules-0.15.0-4.module+el8+2481+4078e9d2.s390x.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:2988-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:2988
Issue date: 2021-08-02

Topic

An update for the varnish:6 module is now available for Red Hat EnterpriseLinux 8, Red Hat Enterprise Linux 8.1 Extended Update Support, and Red HatEnterprise Linux 8.2 Extended Update Support.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 Red Hat attack important update varnish HTTP/2

Relevant Releases Architectures

Red Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux AppStream EUS (v. 8.1) - aarch64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux AppStream EUS (v. 8.2) - aarch64, ppc64le, s390x, 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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