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Red Hat Product Errata RHSA-2021:0245 - Security Advisory
Issued:
2021-01-25
Updated:
2021-01-25

RHSA-2021:0245 - Security Advisory

  • Overview
  • Updated Packages

Synopsis

Moderate: dnsmasq security update

Type/Severity

Security Advisory: Moderate

Red Hat Insights patch analysis

Identify and remediate systems affected by this advisory.

View affected systems

Topic

An update for dnsmasq is now available for Red Hat Enterprise Linux 7.3 Advanced 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

  • Red Hat Enterprise Linux Server - AUS 7.3 x86_64

Fixes

  • BZ - 1889686 - CVE-2020-25684 dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker
  • BZ - 1889688 - CVE-2020-25685 dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker
  • BZ - 1890125 - CVE-2020-25686 dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker

CVEs

  • CVE-2020-25684
  • CVE-2020-25685
  • CVE-2020-25686

References

  • https://access.redhat.com/security/updates/classification/#moderate
  • https://access.redhat.com/security/vulnerabilities/RHSB-2021-001
Note: More recent versions of these packages may be available. Click a package name for more details.

Red Hat Enterprise Linux Server - AUS 7.3

SRPM
dnsmasq-2.66-21.el7_3.3.src.rpm SHA-256: b03e12f530f155bb2d0fff1f695305f988a26bec40ff95e982fe79f12f520c77
x86_64
dnsmasq-2.66-21.el7_3.3.x86_64.rpm SHA-256: cae763b0ea9b3040054eb1fe073738c250202e220c18feab8281017e5c6e18ac
dnsmasq-debuginfo-2.66-21.el7_3.3.x86_64.rpm SHA-256: d9feb929409f739431be234a7743bb5f9c0845c7a50f3a45a7bebb3b8dc4e323
dnsmasq-debuginfo-2.66-21.el7_3.3.x86_64.rpm SHA-256: d9feb929409f739431be234a7743bb5f9c0845c7a50f3a45a7bebb3b8dc4e323
dnsmasq-utils-2.66-21.el7_3.3.x86_64.rpm SHA-256: 9ed3c3eea7b2200ad94bf9bdd03712ac9b472900a838cd3d4dd935fe18512f54

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.

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