Issued:
2021-01-19
Updated:
2021-01-19

RHSA-2021:0155 - Moderate: dnsmasq security update

Synopsis

Moderate: dnsmasq security update

Type/Severity

Security Advisory Moderate

Topic

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.

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.

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

Affected Products

ProductVersionArch
Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions7.6x86_64
Red Hat Enterprise Linux for x86_64 - Extended Update Support7.6x86_64
Red Hat Enterprise Linux for Power, little endian - Extended Update Support7.6ppc64le
Red Hat Enterprise Linux for Power, big endian - Extended Update Support7.6ppc64
Red Hat Enterprise Linux for Power 97ppc64le
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support7.6s390x
Red Hat Enterprise Linux for IBM System z (Structure A)7s390x
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions7.6ppc64le
Red Hat Enterprise Linux Server - TUS7.6x86_64
Red Hat Enterprise Linux Server - AUS7.6x86_64
Red Hat Enterprise Linux EUS Compute Node7.6x86_64

Updated Packages

  • dnsmasq-utils-2.76-7.el7_6.2.ppc64le.rpm
  • dnsmasq-utils-2.76-7.el7_6.2.x86_64.rpm
  • dnsmasq-utils-2.76-7.el7_6.2.s390x.rpm
  • dnsmasq-debuginfo-2.76-7.el7_6.2.ppc64le.rpm
  • dnsmasq-2.76-7.el7_6.2.x86_64.rpm
  • dnsmasq-2.76-7.el7_6.2.ppc64.rpm
  • dnsmasq-debuginfo-2.76-7.el7_6.2.s390x.rpm
  • dnsmasq-2.76-7.el7_6.2.src.rpm
  • dnsmasq-2.76-7.el7_6.2.ppc64le.rpm
  • dnsmasq-2.76-7.el7_6.2.s390x.rpm
  • dnsmasq-debuginfo-2.76-7.el7_6.2.ppc64.rpm
  • dnsmasq-utils-2.76-7.el7_6.2.ppc64.rpm
  • dnsmasq-debuginfo-2.76-7.el7_6.2.x86_64.rpm

Fixes

CVEs

References

Additional information