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Red Hat Enterprise Linux 7.6 RHSA-2021:0155-01 Moderate: Dnsmasq Risk

red hat
Calendar Grey January 19, 2021
Dist Redhat Esm H88
Red Hat Enterprise Linux (RHEL) has enhanced security protocols for dnsmasq, addressing critical vulnerabilities to safeguard stability and confidentiality of services
An update for dnsmasq is now available for Red Hat Enterprise Linux 7.6 Extended Update Support

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

Summary

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.

Topics%20covered

Topics Covered

security advisory security update Red Hat Red Hat Enterprise Linux moderate severity authentication issue moderate risk network service dnsmasq dnsmasq update network server forged replies

References

https://access.redhat.com/security/cve/CVE-2020-25684 https://access.redhat.com/security/cve/CVE-2020-25685 https://access.redhat.com/security/cve/CVE-2020-25686 https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/security/vulnerabilities/RHSB-2021-001

Package List

Red Hat Enterprise Linux ComputeNode EUS (v. 7.6):
Source: dnsmasq-2.76-7.el7_6.2.src.rpm
x86_64: dnsmasq-2.76-7.el7_6.2.x86_64.rpm dnsmasq-debuginfo-2.76-7.el7_6.2.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6):
x86_64: dnsmasq-debuginfo-2.76-7.el7_6.2.x86_64.rpm dnsmasq-utils-2.76-7.el7_6.2.x86_64.rpm
Red Hat Enterprise Linux Server EUS (v. 7.6):
Source: dnsmasq-2.76-7.el7_6.2.src.rpm
ppc64: dnsmasq-2.76-7.el7_6.2.ppc64.rpm dnsmasq-debuginfo-2.76-7.el7_6.2.ppc64.rpm
ppc64le: dnsmasq-2.76-7.el7_6.2.ppc64le.rpm dnsmasq-debuginfo-2.76-7.el7_6.2.ppc64le.rpm
s390x: dnsmasq-2.76-7.el7_6.2.s390x.rpm dnsmasq-debuginfo-2.76-7.el7_6.2.s390x.rpm
x86_64: dnsmasq-2.76-7.el7_6.2.x86_64.rpm dnsmasq-debuginfo-2.76-7.el7_6.2.x86_64.rpm
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7):
Source: dnsmasq-2.76-7.el7_6.2.src.rpm
aarch64: dnsmasq-2.76-7.el7_6.2.aarch64.rpm dnsmasq-debuginfo-2.76-7.el7_6.2.aarch64.rpm
ppc64le: dnsmasq-2.76-7.el7_6.2.ppc64le.rpm dnsmasq-debuginfo-2.76-7.el7_6.2.ppc64le.rpm
s390x: dnsmasq-2.76-7.el7_6.2.s390x.rpm dnsmasq-debuginfo-2.76-7.el7_6.2.s390x.rpm
Red Hat Enterprise Linux Server Optional EUS (v. 7.6):
ppc64: dnsmasq-debuginfo-2.76-7.el7_6.2.ppc64.rpm dnsmasq-utils-2.76-7.el7_6.2.ppc64.rpm
ppc64le:

Read the Full Advisory


Advisory ID: RHSA-2021:0155-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:0155
Issue date: 2021-01-19

Topic

An update for dnsmasq is now available for Red Hat Enterprise Linux 7.6Extended Update Support.Red Hat Product Security has rated this update as having a security impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory security update Red Hat Red Hat Enterprise Linux moderate severity authentication issue moderate risk network service dnsmasq dnsmasq update network server forged replies

Relevant Releases Architectures

Red Hat Enterprise Linux ComputeNode EUS (v. 7.6) - x86_64

Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6) - x86_64

Red Hat Enterprise Linux Server EUS (v. 7.6) - ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional EUS (v. 7.6) - ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) - aarch64, ppc64le, s390x

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) - aarch64, ppc64le, s390x

Bugs Fixed

1889686 - CVE-2020-25684 dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker

1889688 - CVE-2020-25685 dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker

1890125 - CVE-2020-25686 dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker

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