A dnsmasq security update has been released for Red Hat Enterprise Linux 7.6.
RHSA-2021:0155-01: Moderate: dnsmasq security update
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Red Hat Security Advisory
Synopsis: Moderate: dnsmasq security update
Advisory ID: RHSA-2021:0155-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:0155
Issue date: 2021-01-19
CVE Names: CVE-2020-25684 CVE-2020-25685 CVE-2020-25686
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1. Summary:
An update for dnsmasq is now available for Red Hat Enterprise Linux 7.6
Extended Update Support.
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 ComputeNode EUS (v. 7.6) - x86_64
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6) - x86_64
Red Hat Enterprise Linux Server EUS (v. 7.6) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 7.6) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) - aarch64, ppc64le, s390x
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) - aarch64, ppc64le, s390x
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 ComputeNode EUS (v. 7.6):
Source:
dnsmasq-2.76-7.el7_6.2.src.rpm
x86_64:
dnsmasq-2.76-7.el7_6.2.x86_64.rpm
dnsmasq-debuginfo-2.76-7.el7_6.2.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6):
x86_64:
dnsmasq-debuginfo-2.76-7.el7_6.2.x86_64.rpm
dnsmasq-utils-2.76-7.el7_6.2.x86_64.rpm
Red Hat Enterprise Linux Server EUS (v. 7.6):
Source:
dnsmasq-2.76-7.el7_6.2.src.rpm
ppc64:
dnsmasq-2.76-7.el7_6.2.ppc64.rpm
dnsmasq-debuginfo-2.76-7.el7_6.2.ppc64.rpm
ppc64le:
dnsmasq-2.76-7.el7_6.2.ppc64le.rpm
dnsmasq-debuginfo-2.76-7.el7_6.2.ppc64le.rpm
s390x:
dnsmasq-2.76-7.el7_6.2.s390x.rpm
dnsmasq-debuginfo-2.76-7.el7_6.2.s390x.rpm
x86_64:
dnsmasq-2.76-7.el7_6.2.x86_64.rpm
dnsmasq-debuginfo-2.76-7.el7_6.2.x86_64.rpm
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7):
Source:
dnsmasq-2.76-7.el7_6.2.src.rpm
aarch64:
dnsmasq-2.76-7.el7_6.2.aarch64.rpm
dnsmasq-debuginfo-2.76-7.el7_6.2.aarch64.rpm
ppc64le:
dnsmasq-2.76-7.el7_6.2.ppc64le.rpm
dnsmasq-debuginfo-2.76-7.el7_6.2.ppc64le.rpm
s390x:
dnsmasq-2.76-7.el7_6.2.s390x.rpm
dnsmasq-debuginfo-2.76-7.el7_6.2.s390x.rpm
Red Hat Enterprise Linux Server Optional EUS (v. 7.6):
ppc64:
dnsmasq-debuginfo-2.76-7.el7_6.2.ppc64.rpm
dnsmasq-utils-2.76-7.el7_6.2.ppc64.rpm
ppc64le:
dnsmasq-debuginfo-2.76-7.el7_6.2.ppc64le.rpm
dnsmasq-utils-2.76-7.el7_6.2.ppc64le.rpm
s390x:
dnsmasq-debuginfo-2.76-7.el7_6.2.s390x.rpm
dnsmasq-utils-2.76-7.el7_6.2.s390x.rpm
x86_64:
dnsmasq-debuginfo-2.76-7.el7_6.2.x86_64.rpm
dnsmasq-utils-2.76-7.el7_6.2.x86_64.rpm
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7):
aarch64:
dnsmasq-debuginfo-2.76-7.el7_6.2.aarch64.rpm
dnsmasq-utils-2.76-7.el7_6.2.aarch64.rpm
ppc64le:
dnsmasq-debuginfo-2.76-7.el7_6.2.ppc64le.rpm
dnsmasq-utils-2.76-7.el7_6.2.ppc64le.rpm
s390x:
dnsmasq-debuginfo-2.76-7.el7_6.2.s390x.rpm
dnsmasq-utils-2.76-7.el7_6.2.s390x.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 . More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2021 Red Hat, Inc.
