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Red Hat Security Advisory

Synopsis: Low: dnsmasq security and bug fix update
Advisory ID: RHSA-2020:3878-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2020:3878
Issue date: 2020-09-29
CVE Names: CVE-2019-14834
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1. Summary:

An update for dnsmasq is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact
of Low. 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 Client (v. 7) – x86_64
Red Hat Enterprise Linux Client Optional (v. 7) – x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) – x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) – x86_64
Red Hat Enterprise Linux Server (v. 7) – ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) – ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) – x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) – 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: memory leak in the create_helper() function in /src/helper.c
(CVE-2019-14834)

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 7.9 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/):

1752569 – [RHEL-7] Change dhcp_release to use default address when no IP subnet matches
1755610 – dnsmasq not returning REFUSED to DNS queries without the recursion bit set
1757247 – DHCPv6 relay-fwd requests are ignored by dnsmasq
1764425 – CVE-2019-14834 dnsmasq: memory leak in the create_helper() function in /src/helper.c
1815080 – Stop treating SERVFAIL as a successful response from upstream servers

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
dnsmasq-2.76-16.el7.src.rpm

x86_64:
dnsmasq-2.76-16.el7.x86_64.rpm
dnsmasq-debuginfo-2.76-16.el7.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
dnsmasq-debuginfo-2.76-16.el7.x86_64.rpm
dnsmasq-utils-2.76-16.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
dnsmasq-2.76-16.el7.src.rpm

x86_64:
dnsmasq-2.76-16.el7.x86_64.rpm
dnsmasq-debuginfo-2.76-16.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64:
dnsmasq-debuginfo-2.76-16.el7.x86_64.rpm
dnsmasq-utils-2.76-16.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
dnsmasq-2.76-16.el7.src.rpm

ppc64:
dnsmasq-2.76-16.el7.ppc64.rpm
dnsmasq-debuginfo-2.76-16.el7.ppc64.rpm

ppc64le:
dnsmasq-2.76-16.el7.ppc64le.rpm
dnsmasq-debuginfo-2.76-16.el7.ppc64le.rpm

s390x:
dnsmasq-2.76-16.el7.s390x.rpm
dnsmasq-debuginfo-2.76-16.el7.s390x.rpm

x86_64:
dnsmasq-2.76-16.el7.x86_64.rpm
dnsmasq-debuginfo-2.76-16.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

ppc64:
dnsmasq-debuginfo-2.76-16.el7.ppc64.rpm
dnsmasq-utils-2.76-16.el7.ppc64.rpm

ppc64le:
dnsmasq-debuginfo-2.76-16.el7.ppc64le.rpm
dnsmasq-utils-2.76-16.el7.ppc64le.rpm

s390x:
dnsmasq-debuginfo-2.76-16.el7.s390x.rpm
dnsmasq-utils-2.76-16.el7.s390x.rpm

x86_64:
dnsmasq-debuginfo-2.76-16.el7.x86_64.rpm
dnsmasq-utils-2.76-16.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
dnsmasq-2.76-16.el7.src.rpm

x86_64:
dnsmasq-2.76-16.el7.x86_64.rpm
dnsmasq-debuginfo-2.76-16.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
dnsmasq-debuginfo-2.76-16.el7.x86_64.rpm
dnsmasq-utils-2.76-16.el7.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-2019-14834
https://access.redhat.com/security/updates/classification/#low
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.9_release_notes/index

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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