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Red Hat Product Errata RHSA-2021:0153 - Security Advisory
Issued:
2021-01-19
Updated:
2021-01-19

RHSA-2021:0153 - Security Advisory

  • Overview
  • Updated Packages

Synopsis

Moderate: dnsmasq security update

Type/Severity

Security Advisory: Moderate

Topic

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 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 7 x86_64
  • Red Hat Enterprise Linux Workstation 7 x86_64
  • Red Hat Enterprise Linux Desktop 7 x86_64
  • Red Hat Enterprise Linux for IBM z Systems 7 s390x
  • Red Hat Enterprise Linux for Power, big endian 7 ppc64
  • Red Hat Enterprise Linux for Scientific Computing 7 x86_64
  • Red Hat Enterprise Linux for Power, little endian 7 ppc64le

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 7

    SRPM
    dnsmasq-2.76-16.el7_9.1.src.rpm SHA-256: 4bcecf8b12e04a16af2f706e7a82a1c191bdae823751bba600cad94c287129be
    x86_64
    dnsmasq-2.76-16.el7_9.1.x86_64.rpm SHA-256: 4b578cfbf8154bad3e1144dc4593c379bf2e51fda58da942d88afa7080b72cda
    dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm SHA-256: fd4591afc34bca274886654467841194f84ba9e20bc53b222c715f07ecb1bca6
    dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm SHA-256: fd4591afc34bca274886654467841194f84ba9e20bc53b222c715f07ecb1bca6
    dnsmasq-utils-2.76-16.el7_9.1.x86_64.rpm SHA-256: 4227697248b6318e78acf0a83a2749ee34d9dd0ed3c0992e5dd6826396b144ca

    Red Hat Enterprise Linux Workstation 7

    SRPM
    dnsmasq-2.76-16.el7_9.1.src.rpm SHA-256: 4bcecf8b12e04a16af2f706e7a82a1c191bdae823751bba600cad94c287129be
    x86_64
    dnsmasq-2.76-16.el7_9.1.x86_64.rpm SHA-256: 4b578cfbf8154bad3e1144dc4593c379bf2e51fda58da942d88afa7080b72cda
    dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm SHA-256: fd4591afc34bca274886654467841194f84ba9e20bc53b222c715f07ecb1bca6
    dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm SHA-256: fd4591afc34bca274886654467841194f84ba9e20bc53b222c715f07ecb1bca6
    dnsmasq-utils-2.76-16.el7_9.1.x86_64.rpm SHA-256: 4227697248b6318e78acf0a83a2749ee34d9dd0ed3c0992e5dd6826396b144ca

    Red Hat Enterprise Linux Desktop 7

    SRPM
    dnsmasq-2.76-16.el7_9.1.src.rpm SHA-256: 4bcecf8b12e04a16af2f706e7a82a1c191bdae823751bba600cad94c287129be
    x86_64
    dnsmasq-2.76-16.el7_9.1.x86_64.rpm SHA-256: 4b578cfbf8154bad3e1144dc4593c379bf2e51fda58da942d88afa7080b72cda
    dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm SHA-256: fd4591afc34bca274886654467841194f84ba9e20bc53b222c715f07ecb1bca6
    dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm SHA-256: fd4591afc34bca274886654467841194f84ba9e20bc53b222c715f07ecb1bca6
    dnsmasq-utils-2.76-16.el7_9.1.x86_64.rpm SHA-256: 4227697248b6318e78acf0a83a2749ee34d9dd0ed3c0992e5dd6826396b144ca

    Red Hat Enterprise Linux for IBM z Systems 7

    SRPM
    dnsmasq-2.76-16.el7_9.1.src.rpm SHA-256: 4bcecf8b12e04a16af2f706e7a82a1c191bdae823751bba600cad94c287129be
    s390x
    dnsmasq-2.76-16.el7_9.1.s390x.rpm SHA-256: cd1201e69a6ee4e94e28931e7c1af156a2d049754ed542bb4b36b1e479285527
    dnsmasq-debuginfo-2.76-16.el7_9.1.s390x.rpm SHA-256: 699cbc6bcf29e5c0798fefd6cafa0a017990e70ab085a45745e6e370b3d83556
    dnsmasq-debuginfo-2.76-16.el7_9.1.s390x.rpm SHA-256: 699cbc6bcf29e5c0798fefd6cafa0a017990e70ab085a45745e6e370b3d83556
    dnsmasq-utils-2.76-16.el7_9.1.s390x.rpm SHA-256: f815b66cdc28b5ca5419537a28ddf08cf6abeda720ac5667d1e033f7da07b883

    Red Hat Enterprise Linux for Power, big endian 7

    SRPM
    dnsmasq-2.76-16.el7_9.1.src.rpm SHA-256: 4bcecf8b12e04a16af2f706e7a82a1c191bdae823751bba600cad94c287129be
    ppc64
    dnsmasq-2.76-16.el7_9.1.ppc64.rpm SHA-256: 38bd06e17ac599dbb1bb6843aab4f6072dea50c47dc493375eda84da1d9afd0b
    dnsmasq-debuginfo-2.76-16.el7_9.1.ppc64.rpm SHA-256: daac6929d507edfa44b5bbd49c2d0afc125cf5a6a9e3c830a00675feb64c0227
    dnsmasq-debuginfo-2.76-16.el7_9.1.ppc64.rpm SHA-256: daac6929d507edfa44b5bbd49c2d0afc125cf5a6a9e3c830a00675feb64c0227
    dnsmasq-utils-2.76-16.el7_9.1.ppc64.rpm SHA-256: d3f4575df346a531db9eae5eef457a7858d14e92a8b9fb42cd37cd1294078368

    Red Hat Enterprise Linux for Scientific Computing 7

    SRPM
    dnsmasq-2.76-16.el7_9.1.src.rpm SHA-256: 4bcecf8b12e04a16af2f706e7a82a1c191bdae823751bba600cad94c287129be
    x86_64
    dnsmasq-2.76-16.el7_9.1.x86_64.rpm SHA-256: 4b578cfbf8154bad3e1144dc4593c379bf2e51fda58da942d88afa7080b72cda
    dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm SHA-256: fd4591afc34bca274886654467841194f84ba9e20bc53b222c715f07ecb1bca6
    dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm SHA-256: fd4591afc34bca274886654467841194f84ba9e20bc53b222c715f07ecb1bca6
    dnsmasq-utils-2.76-16.el7_9.1.x86_64.rpm SHA-256: 4227697248b6318e78acf0a83a2749ee34d9dd0ed3c0992e5dd6826396b144ca

    Red Hat Enterprise Linux for Power, little endian 7

    SRPM
    dnsmasq-2.76-16.el7_9.1.src.rpm SHA-256: 4bcecf8b12e04a16af2f706e7a82a1c191bdae823751bba600cad94c287129be
    ppc64le
    dnsmasq-2.76-16.el7_9.1.ppc64le.rpm SHA-256: 7daf172ddba28e6c8d9441adedbee5c3ccdbebf89ba402d0ada94c62b1d9b812
    dnsmasq-debuginfo-2.76-16.el7_9.1.ppc64le.rpm SHA-256: c323f2b2dc6d3760bb5854d477306b5a4920d11e86060020a44b1c831601f079
    dnsmasq-debuginfo-2.76-16.el7_9.1.ppc64le.rpm SHA-256: c323f2b2dc6d3760bb5854d477306b5a4920d11e86060020a44b1c831601f079
    dnsmasq-utils-2.76-16.el7_9.1.ppc64le.rpm SHA-256: 378a19d49f2d11e155bc47688122d330a728338b276e2ef2c42fa1bb7ae1b477

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

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