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Red Hat Enterprise Linux 7 RHSA-2021-0153-01 Moderate: Dnsmasq Attack Risk

red hat
Calendar Grey January 19, 2021
Dist Redhat Esm H88
An update for dnsmasq on Red Hat Enterprise Linux 7 has been released, classified as moderate severity, encompassing a range of crucial security patches.
An update for dnsmasq is now available for Red Hat Enterprise Linux 7

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 Red Hat security fix moderate severity DHCP network service attack mitigation Moderate network dnsmasq

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 Client (v. 7):
Source: dnsmasq-2.76-16.el7_9.1.src.rpm
x86_64: dnsmasq-2.76-16.el7_9.1.x86_64.rpm dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
x86_64: dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm dnsmasq-utils-2.76-16.el7_9.1.x86_64.rpm
Red Hat Enterprise Linux ComputeNode (v. 7):
Source: dnsmasq-2.76-16.el7_9.1.src.rpm
x86_64: dnsmasq-2.76-16.el7_9.1.x86_64.rpm dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional (v. 7):
x86_64: dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm dnsmasq-utils-2.76-16.el7_9.1.x86_64.rpm
Red Hat Enterprise Linux Server (v. 7):
Source: dnsmasq-2.76-16.el7_9.1.src.rpm
ppc64: dnsmasq-2.76-16.el7_9.1.ppc64.rpm dnsmasq-debuginfo-2.76-16.el7_9.1.ppc64.rpm
ppc64le: dnsmasq-2.76-16.el7_9.1.ppc64le.rpm dnsmasq-debuginfo-2.76-16.el7_9.1.ppc64le.rpm
s390x: dnsmasq-2.76-16.el7_9.1.s390x.rpm dnsmasq-debuginfo-2.76-16.el7_9.1.s390x.rpm
x86_64: dnsmasq-2.76-16.el7_9.1.x86_64.rpm dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm
Red Hat Enterprise Linux Server Optional (v. 7):
ppc64: dnsmasq-debuginfo-2.76-16.el7_9.1.ppc64.rpm dnsmasq-utils-2.76-16.el7_9.1.ppc64.rpm
ppc64le: dnsmasq-debuginfo-2.76-16.el7_9.1.ppc64le.rpm dnsmasq-utils-2.76-16.el7_9.1.ppc64le.rpm


Read the Full Advisory


Advisory ID: RHSA-2021:0153-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:0153
Issue date: 2021-01-19

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 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 Red Hat security fix moderate severity DHCP network service attack mitigation Moderate network dnsmasq

Relevant Releases Architectures

Red Hat Enterprise Linux Client (v. 7) - x86_64

Red Hat Enterprise Linux Client Optional (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64

Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 7) - x86_64

Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

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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