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Red Hat Product Errata RHSA-2021:0150 - Security Advisory
Issued:
2021-01-19
Updated:
2021-01-19

RHSA-2021:0150 - Security Advisory

  • Overview
  • Updated Packages

Synopsis

Important: dnsmasq security update

Type/Severity

Security Advisory: Important

Topic

An update for dnsmasq is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Important. 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: heap-based buffer overflow in sort_rrset() when DNSSEC is enabled (CVE-2020-25681)
  • dnsmasq: buffer overflow in extract_name() due to missing length check when DNSSEC is enabled (CVE-2020-25682)
  • dnsmasq: heap-based buffer overflow with large memcpy in get_rdata() when DNSSEC is enabled (CVE-2020-25683)
  • 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)
  • dnsmasq: heap-based buffer overflow with large memcpy in sort_rrset() when DNSSEC is enabled (CVE-2020-25687)

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 for x86_64 8 x86_64
  • Red Hat Enterprise Linux for IBM z Systems 8 s390x
  • Red Hat Enterprise Linux for Power, little endian 8 ppc64le
  • Red Hat Enterprise Linux for ARM 64 8 aarch64

Fixes

  • BZ - 1881875 - CVE-2020-25681 dnsmasq: heap-based buffer overflow in sort_rrset() when DNSSEC is enabled
  • BZ - 1882014 - CVE-2020-25682 dnsmasq: buffer overflow in extract_name() due to missing length check when DNSSEC is enabled
  • BZ - 1882018 - CVE-2020-25683 dnsmasq: heap-based buffer overflow with large memcpy in get_rdata() when DNSSEC is enabled
  • 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
  • BZ - 1891568 - CVE-2020-25687 dnsmasq: heap-based buffer overflow with large memcpy in sort_rrset() when DNSSEC is enabled

CVEs

  • CVE-2020-25681
  • CVE-2020-25682
  • CVE-2020-25683
  • CVE-2020-25684
  • CVE-2020-25685
  • CVE-2020-25686
  • CVE-2020-25687

References

  • https://access.redhat.com/security/updates/classification/#important
  • 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 for x86_64 8

    SRPM
    dnsmasq-2.79-13.el8_3.1.src.rpm SHA-256: 838968c37f8a85eb8f29045af013fd3aab04ee41d2186055cae1c7c2591ac1f7
    x86_64
    dnsmasq-2.79-13.el8_3.1.x86_64.rpm SHA-256: c3f27c9e15c94ed54faab2f1cc69c74e71173134de4f6803e6047d7230dc1aae
    dnsmasq-debuginfo-2.79-13.el8_3.1.x86_64.rpm SHA-256: f39738415299f8c33d91812b798813e82184ae5c3de73b6dabf48b95b1f99c14
    dnsmasq-debugsource-2.79-13.el8_3.1.x86_64.rpm SHA-256: b5172405a672e8483defe9b92e745831a360465194191cdc73b6cd7c1d3b22bc
    dnsmasq-utils-2.79-13.el8_3.1.x86_64.rpm SHA-256: ef1cdbfe9d0b45b796fe93d8b156b185c2aa7e0f17b0db2570ca7f71a5ae0896
    dnsmasq-utils-debuginfo-2.79-13.el8_3.1.x86_64.rpm SHA-256: e54d1232ab1624377e582240416066ffa1a31a05fbcbfdf8de0b89cd251e701d

    Red Hat Enterprise Linux for IBM z Systems 8

    SRPM
    dnsmasq-2.79-13.el8_3.1.src.rpm SHA-256: 838968c37f8a85eb8f29045af013fd3aab04ee41d2186055cae1c7c2591ac1f7
    s390x
    dnsmasq-2.79-13.el8_3.1.s390x.rpm SHA-256: b8aa40d1659589f28697cdbcf614b08a3176e99e840e2120fb7eeb6ae556cee5
    dnsmasq-debuginfo-2.79-13.el8_3.1.s390x.rpm SHA-256: 63ca531d1f0c29da21dad552b88b1261d3855e79f1ca2c9c94fe3a92325788fa
    dnsmasq-debugsource-2.79-13.el8_3.1.s390x.rpm SHA-256: 2045eff54eb82159ed2ff42fbf70deec175bdaf26ddd61a1b03156ab05e2bf2b
    dnsmasq-utils-2.79-13.el8_3.1.s390x.rpm SHA-256: 9b3a5dbea09791744d453ecd9179dba15651601b6b65251cf8dcf5b1607eef47
    dnsmasq-utils-debuginfo-2.79-13.el8_3.1.s390x.rpm SHA-256: b6b74f677942462534a3b6da4affe53ca31556ece9dcaf167b79b16bd9806000

    Red Hat Enterprise Linux for Power, little endian 8

    SRPM
    dnsmasq-2.79-13.el8_3.1.src.rpm SHA-256: 838968c37f8a85eb8f29045af013fd3aab04ee41d2186055cae1c7c2591ac1f7
    ppc64le
    dnsmasq-2.79-13.el8_3.1.ppc64le.rpm SHA-256: 0332b31d5a9bccd25f8234a34f8e92cc6fa554b8b5226a36b179f29de43a4e07
    dnsmasq-debuginfo-2.79-13.el8_3.1.ppc64le.rpm SHA-256: 8861afe238b20e83195243bbc87a7c3cabcc523ebf85d6861f1d90b0b5efc28a
    dnsmasq-debugsource-2.79-13.el8_3.1.ppc64le.rpm SHA-256: 9c55ca58a308f7c10ed90cb160fbc31d0101668c18a1f2e6a0c14dc6b1e48005
    dnsmasq-utils-2.79-13.el8_3.1.ppc64le.rpm SHA-256: 700edfaeb68b2cd592662c73fc8d7450d1343d6b916e551c074c587aadb31aee
    dnsmasq-utils-debuginfo-2.79-13.el8_3.1.ppc64le.rpm SHA-256: 60f85f10cff1776bada8acbcf4e1d7fbc0e6754b70338a54dca59a65dd888c4a

    Red Hat Enterprise Linux for ARM 64 8

    SRPM
    dnsmasq-2.79-13.el8_3.1.src.rpm SHA-256: 838968c37f8a85eb8f29045af013fd3aab04ee41d2186055cae1c7c2591ac1f7
    aarch64
    dnsmasq-2.79-13.el8_3.1.aarch64.rpm SHA-256: 9e2c036da71bb6157b598fec35fbc1ed5beb20386ddc056282bbb4014b3ad3ee
    dnsmasq-debuginfo-2.79-13.el8_3.1.aarch64.rpm SHA-256: 46d70a0664acc204e2663e24d1ea4dbda5ea088258cebe9b7e85e741ad85ff33
    dnsmasq-debugsource-2.79-13.el8_3.1.aarch64.rpm SHA-256: ac3173e9c6ef6af3383b1f404fb92c0f6fae691cba369ad869a9f15dbfe3a124
    dnsmasq-utils-2.79-13.el8_3.1.aarch64.rpm SHA-256: 93310bdb2b5a5b94201fe85cc5d100d8205d2c578686c552e2132945eb8933c6
    dnsmasq-utils-debuginfo-2.79-13.el8_3.1.aarch64.rpm SHA-256: 0ed5a35cdc3c229f55c0643d4d7695e75ca2e5dc4791cd9d567f94073c54f0c5

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

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