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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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