-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

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

Synopsis:          Moderate: dnsmasq security update
Advisory ID:       RHSA-2021:0245-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:0245
Issue date:        2021-01-25
CVE Names:         CVE-2020-25684 CVE-2020-25685 CVE-2020-25686 
=====================================================================

1. Summary:

An update for dnsmasq is now available for Red Hat Enterprise Linux 7.3
Advanced Update Support.

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 Server AUS (v. 7.3) - x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 7.3) - x86_64

3. Description:

The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name
Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.

Security Fix(es):

* dnsmasq: loose address/port check in reply_query() makes forging replies
easier for an off-path attacker (CVE-2020-25684)

* dnsmasq: loose query name check in reply_query() makes forging replies
easier for an off-path attacker (CVE-2020-25685)

* dnsmasq: multiple queries forwarded for the same name makes forging
replies easier for an off-path attacker (CVE-2020-25686)

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.

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/):

1889686 - CVE-2020-25684 dnsmasq: loose address/port check in reply_query()
 makes forging replies easier for an off-path attacker
1889688 - CVE-2020-25685 dnsmasq: loose query name check in reply_query() makes
 forging replies easier for an off-path attacker
1890125 - CVE-2020-25686 dnsmasq: multiple queries forwarded for the same name
 makes forging replies easier for an off-path attacker

6. Package List:

Red Hat Enterprise Linux Server AUS (v. 7.3):

Source:
dnsmasq-2.66-21.el7_3.3.src.rpm

x86_64:
dnsmasq-2.66-21.el7_3.3.x86_64.rpm
dnsmasq-debuginfo-2.66-21.el7_3.3.x86_64.rpm

Red Hat Enterprise Linux Server Optional AUS (v. 7.3):

x86_64:
dnsmasq-debuginfo-2.66-21.el7_3.3.x86_64.rpm
dnsmasq-utils-2.66-21.el7_3.3.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-2020-25684
https://access.redhat.com/security/cve/CVE-2020-25685
https://access.redhat.com/security/cve/CVE-2020-25686
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/security/vulnerabilities/RHSB-2021-001

8. Contact:

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

Copyright 2021 Red Hat, Inc.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1
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=56a7
-----END PGP SIGNATURE-----

--
RHSA-announce mailing list
RHSA-announce@redhat.com
https://www.redhat.com/mailman/listinfo/rhsa-announce