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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.3720
                    dnsmasq security and bug fix update
                             10 November 2021

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           dnsmasq
Publisher:         Red Hat
Operating System:  Red Hat
Impact/Access:     Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-3448  

Reference:         ESB-2021.0954
                   ESB-2021.3585
                   ESB-2021.1918
                   ESB-2021.3720

Original Bulletin: 
   https://access.redhat.com/errata/RHSA-2021:4153

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

Synopsis:          Moderate: dnsmasq security and bug fix update
Advisory ID:       RHSA-2021:4153-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:4153
Issue date:        2021-11-09
CVE Names:         CVE-2021-3448 
=====================================================================

1. Summary:

An update for dnsmasq 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:

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

Security Fix(es):

* dnsmasq: fixed outgoing port used when --server is used with an interface
name (CVE-2021-3448)

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 8.5 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/):

1921153 - failed to send packet: Network is unreachable when resolution is busy.
1927973 - dnsmasq --bind-dynamic stops replying to upstream queries
1939368 - CVE-2021-3448 dnsmasq: fixed outgoing port used when --server is used with an interface name
1947039 - typo in dnsmasq man page

6. Package List:

Red Hat Enterprise Linux AppStream (v. 8):

Source:
dnsmasq-2.79-19.el8.src.rpm

aarch64:
dnsmasq-2.79-19.el8.aarch64.rpm
dnsmasq-debuginfo-2.79-19.el8.aarch64.rpm
dnsmasq-debugsource-2.79-19.el8.aarch64.rpm
dnsmasq-utils-2.79-19.el8.aarch64.rpm
dnsmasq-utils-debuginfo-2.79-19.el8.aarch64.rpm

ppc64le:
dnsmasq-2.79-19.el8.ppc64le.rpm
dnsmasq-debuginfo-2.79-19.el8.ppc64le.rpm
dnsmasq-debugsource-2.79-19.el8.ppc64le.rpm
dnsmasq-utils-2.79-19.el8.ppc64le.rpm
dnsmasq-utils-debuginfo-2.79-19.el8.ppc64le.rpm

s390x:
dnsmasq-2.79-19.el8.s390x.rpm
dnsmasq-debuginfo-2.79-19.el8.s390x.rpm
dnsmasq-debugsource-2.79-19.el8.s390x.rpm
dnsmasq-utils-2.79-19.el8.s390x.rpm
dnsmasq-utils-debuginfo-2.79-19.el8.s390x.rpm

x86_64:
dnsmasq-2.79-19.el8.x86_64.rpm
dnsmasq-debuginfo-2.79-19.el8.x86_64.rpm
dnsmasq-debugsource-2.79-19.el8.x86_64.rpm
dnsmasq-utils-2.79-19.el8.x86_64.rpm
dnsmasq-utils-debuginfo-2.79-19.el8.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-2021-3448
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.5_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 2021 Red Hat, Inc.
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