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Red Hat Enterprise Linux 7.4 Security Update: Dnsmasq RHSA-2021:0156-01

red hat
Calendar Grey January 19, 2021
Dist Redhat Esm H88
Canonical has released a noteworthy security patch for openvpn, addressing various vulnerabilities impacting Ubuntu systems.
An update for dnsmasq is now available for Red Hat Enterprise Linux 7.4 Advanced Update Support, Red Hat Enterprise Linux 7.4 Telco Extended Update Support, and Red Hat Enterprise ...

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 moderate update DoS security fix Red Hat Enterprise Linux moderate impact red hat enterprise linux network service 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 Server AUS (v. 7.4):
Source: dnsmasq-2.76-2.el7_4.3.src.rpm
x86_64: dnsmasq-2.76-2.el7_4.3.x86_64.rpm dnsmasq-debuginfo-2.76-2.el7_4.3.x86_64.rpm
Red Hat Enterprise Linux Server E4S (v. 7.4):
Source: dnsmasq-2.76-2.el7_4.3.src.rpm
ppc64le: dnsmasq-2.76-2.el7_4.3.ppc64le.rpm dnsmasq-debuginfo-2.76-2.el7_4.3.ppc64le.rpm
x86_64: dnsmasq-2.76-2.el7_4.3.x86_64.rpm dnsmasq-debuginfo-2.76-2.el7_4.3.x86_64.rpm
Red Hat Enterprise Linux Server TUS (v. 7.4):
Source: dnsmasq-2.76-2.el7_4.3.src.rpm
x86_64: dnsmasq-2.76-2.el7_4.3.x86_64.rpm dnsmasq-debuginfo-2.76-2.el7_4.3.x86_64.rpm
Red Hat Enterprise Linux Server Optional AUS (v. 7.4):
x86_64: dnsmasq-debuginfo-2.76-2.el7_4.3.x86_64.rpm dnsmasq-utils-2.76-2.el7_4.3.x86_64.rpm
Red Hat Enterprise Linux Server Optional E4S (v. 7.4):
ppc64le: dnsmasq-debuginfo-2.76-2.el7_4.3.ppc64le.rpm dnsmasq-utils-2.76-2.el7_4.3.ppc64le.rpm
x86_64: dnsmasq-debuginfo-2.76-2.el7_4.3.x86_64.rpm dnsmasq-utils-2.76-2.el7_4.3.x86_64.rpm
Red Hat Enterprise Linux Server Optional TUS (v. 7.4):
x86_64: dnsmasq-debuginfo-2.76-2.el7_4.3.x86_64.rpm dnsmasq-utils-2.76-2.el7_4.3.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/


Advisory ID: RHSA-2021:0156-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:0156
Issue date: 2021-01-19

Topic

An update for dnsmasq is now available for Red Hat Enterprise Linux 7.4Advanced Update Support, Red Hat Enterprise Linux 7.4 Telco Extended UpdateSupport, and Red Hat Enterprise Linux 7.4 Update Services for SAPSolutions.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 moderate update DoS security fix Red Hat Enterprise Linux moderate impact red hat enterprise linux network service dnsmasq

Relevant Releases Architectures

Red Hat Enterprise Linux Server AUS (v. 7.4) - x86_64

Red Hat Enterprise Linux Server E4S (v. 7.4) - ppc64le, x86_64

Red Hat Enterprise Linux Server Optional AUS (v. 7.4) - x86_64

Red Hat Enterprise Linux Server Optional E4S (v. 7.4) - ppc64le, x86_64

Red Hat Enterprise Linux Server Optional TUS (v. 7.4) - x86_64

Red Hat Enterprise Linux Server TUS (v. 7.4) - 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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