Issued:

2021-01-19

Updated:

2021-01-19

RHSA-2021:0150 - Important: dnsmasq security update

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

Updated Packages

• dnsmasq-2.79-13.el8_3.1.ppc64le.rpm
• dnsmasq-utils-debuginfo-2.79-13.el8_3.1.x86_64.rpm
• dnsmasq-utils-debuginfo-2.79-13.el8_3.1.s390x.rpm
• dnsmasq-2.79-13.el8_3.1.x86_64.rpm
• dnsmasq-utils-2.79-13.el8_3.1.ppc64le.rpm
• dnsmasq-2.79-13.el8_3.1.s390x.rpm
• dnsmasq-utils-debuginfo-2.79-13.el8_3.1.ppc64le.rpm
• dnsmasq-2.79-13.el8_3.1.src.rpm
• dnsmasq-utils-2.79-13.el8_3.1.aarch64.rpm
• dnsmasq-debugsource-2.79-13.el8_3.1.s390x.rpm
• dnsmasq-utils-2.79-13.el8_3.1.x86_64.rpm
• dnsmasq-debugsource-2.79-13.el8_3.1.x86_64.rpm
• dnsmasq-debugsource-2.79-13.el8_3.1.ppc64le.rpm
• dnsmasq-debuginfo-2.79-13.el8_3.1.s390x.rpm
• dnsmasq-2.79-13.el8_3.1.aarch64.rpm
• dnsmasq-utils-debuginfo-2.79-13.el8_3.1.aarch64.rpm
• dnsmasq-debuginfo-2.79-13.el8_3.1.x86_64.rpm
• dnsmasq-debuginfo-2.79-13.el8_3.1.aarch64.rpm
• dnsmasq-debugsource-2.79-13.el8_3.1.aarch64.rpm
• dnsmasq-utils-2.79-13.el8_3.1.s390x.rpm
• dnsmasq-debuginfo-2.79-13.el8_3.1.ppc64le.rpm

Fixes

• This content is not included.BZ - 1881875
• This content is not included.BZ - 1882014
• This content is not included.BZ - 1882018
• This content is not included.BZ - 1889686
• This content is not included.BZ - 1889688
• This content is not included.BZ - 1890125
• This content is not included.BZ - 1891568

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
• This content is not included.This content is not included.https://access.redhat.com/security/vulnerabilities/RHSB-2021-001

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.