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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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