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Red Hat Security Advisory

Synopsis:          Moderate: dnsmasq security update
Advisory ID:       RHSA-2021:0156-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:0156
Issue date:        2021-01-19
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 7.4
Advanced Update Support, Red Hat Enterprise Linux 7.4 Telco Extended Update
Support, and Red Hat Enterprise Linux 7.4 Update Services for SAP
Solutions.

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. 7.4) - x86_64
Red Hat Enterprise Linux Server E4S (v. 7.4) - ppc64le, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 7.4) - x86_64
Red Hat Enterprise Linux Server Optional E4S (v. 7.4) - ppc64le, x86_64
Red Hat Enterprise Linux Server Optional TUS (v. 7.4) - x86_64
Red Hat Enterprise Linux Server TUS (v. 7.4) - 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. 7.4):

Source:
dnsmasq-2.76-2.el7_4.3.src.rpm

x86_64:
dnsmasq-2.76-2.el7_4.3.x86_64.rpm
dnsmasq-debuginfo-2.76-2.el7_4.3.x86_64.rpm

Red Hat Enterprise Linux Server E4S (v. 7.4):

Source:
dnsmasq-2.76-2.el7_4.3.src.rpm

ppc64le:
dnsmasq-2.76-2.el7_4.3.ppc64le.rpm
dnsmasq-debuginfo-2.76-2.el7_4.3.ppc64le.rpm

x86_64:
dnsmasq-2.76-2.el7_4.3.x86_64.rpm
dnsmasq-debuginfo-2.76-2.el7_4.3.x86_64.rpm

Red Hat Enterprise Linux Server TUS (v. 7.4):

Source:
dnsmasq-2.76-2.el7_4.3.src.rpm

x86_64:
dnsmasq-2.76-2.el7_4.3.x86_64.rpm
dnsmasq-debuginfo-2.76-2.el7_4.3.x86_64.rpm

Red Hat Enterprise Linux Server Optional AUS (v. 7.4):

x86_64:
dnsmasq-debuginfo-2.76-2.el7_4.3.x86_64.rpm
dnsmasq-utils-2.76-2.el7_4.3.x86_64.rpm

Red Hat Enterprise Linux Server Optional E4S (v. 7.4):

ppc64le:
dnsmasq-debuginfo-2.76-2.el7_4.3.ppc64le.rpm
dnsmasq-utils-2.76-2.el7_4.3.ppc64le.rpm

x86_64:
dnsmasq-debuginfo-2.76-2.el7_4.3.x86_64.rpm
dnsmasq-utils-2.76-2.el7_4.3.x86_64.rpm

Red Hat Enterprise Linux Server Optional TUS (v. 7.4):

x86_64:
dnsmasq-debuginfo-2.76-2.el7_4.3.x86_64.rpm
dnsmasq-utils-2.76-2.el7_4.3.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.
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