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====================================================================                   
Red Hat Security Advisory

Synopsis:          Moderate: varnish:6 security, bug fix, and enhancement update
Advisory ID:       RHSA-2020:4756-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2020:4756
Issue date:        2020-11-03
CVE Names:         CVE-2019-15892 CVE-2019-20637 CVE-2020-11653
====================================================================
1. Summary:

An update for the varnish:6 module is now available for Red Hat Enterprise
Linux 8.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

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

3. Description:

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.

4. 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

5. Bugs fixed (https://bugzilla.redhat.com/):

1756079 - CVE-2019-15892 varnish: denial of service handling certain crafted HTTP/1 requests
1772362 - CVE-2019-20637 varnish: not clearing pointer between two client requests leads to information disclosure
1813867 - CVE-2020-11653 varnish: remote clients may cause Varnish to assert and restart which could result in DoS

6. Package List:

Red Hat Enterprise Linux AppStream (v. 8):

Source:
varnish-6.0.6-2.module+el8.3.0+6843+b3b42fcc.src.rpm
varnish-modules-0.15.0-5.module+el8.3.0+6843+b3b42fcc.src.rpm

aarch64:
varnish-6.0.6-2.module+el8.3.0+6843+b3b42fcc.aarch64.rpm
varnish-devel-6.0.6-2.module+el8.3.0+6843+b3b42fcc.aarch64.rpm
varnish-docs-6.0.6-2.module+el8.3.0+6843+b3b42fcc.aarch64.rpm
varnish-modules-0.15.0-5.module+el8.3.0+6843+b3b42fcc.aarch64.rpm
varnish-modules-debuginfo-0.15.0-5.module+el8.3.0+6843+b3b42fcc.aarch64.rpm
varnish-modules-debugsource-0.15.0-5.module+el8.3.0+6843+b3b42fcc.aarch64.rpm

ppc64le:
varnish-6.0.6-2.module+el8.3.0+6843+b3b42fcc.ppc64le.rpm
varnish-devel-6.0.6-2.module+el8.3.0+6843+b3b42fcc.ppc64le.rpm
varnish-docs-6.0.6-2.module+el8.3.0+6843+b3b42fcc.ppc64le.rpm
varnish-modules-0.15.0-5.module+el8.3.0+6843+b3b42fcc.ppc64le.rpm
varnish-modules-debuginfo-0.15.0-5.module+el8.3.0+6843+b3b42fcc.ppc64le.rpm
varnish-modules-debugsource-0.15.0-5.module+el8.3.0+6843+b3b42fcc.ppc64le.rpm

s390x:
varnish-6.0.6-2.module+el8.3.0+6843+b3b42fcc.s390x.rpm
varnish-devel-6.0.6-2.module+el8.3.0+6843+b3b42fcc.s390x.rpm
varnish-docs-6.0.6-2.module+el8.3.0+6843+b3b42fcc.s390x.rpm
varnish-modules-0.15.0-5.module+el8.3.0+6843+b3b42fcc.s390x.rpm
varnish-modules-debuginfo-0.15.0-5.module+el8.3.0+6843+b3b42fcc.s390x.rpm
varnish-modules-debugsource-0.15.0-5.module+el8.3.0+6843+b3b42fcc.s390x.rpm

x86_64:
varnish-6.0.6-2.module+el8.3.0+6843+b3b42fcc.x86_64.rpm
varnish-devel-6.0.6-2.module+el8.3.0+6843+b3b42fcc.x86_64.rpm
varnish-docs-6.0.6-2.module+el8.3.0+6843+b3b42fcc.x86_64.rpm
varnish-modules-0.15.0-5.module+el8.3.0+6843+b3b42fcc.x86_64.rpm
varnish-modules-debuginfo-0.15.0-5.module+el8.3.0+6843+b3b42fcc.x86_64.rpm
varnish-modules-debugsource-0.15.0-5.module+el8.3.0+6843+b3b42fcc.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2019-15892
https://access.redhat.com/security/cve/CVE-2019-20637
https://access.redhat.com/security/cve/CVE-2020-11653
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.3_release_notes/

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2020 Red Hat, Inc.
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