Improperly Implemented Security Check for Standard Affecting dnsmasq-utils package, versions <0:2.79-19.el8


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.22% (62nd percentile)

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  • Snyk IDSNYK-RHEL8-DNSMASQUTILS-4101682
  • published26 Jul 2021
  • disclosed12 Mar 2021

Introduced: 12 Mar 2021

CVE-2021-3448  (opens in a new tab)
CWE-358  (opens in a new tab)

How to fix?

Upgrade RHEL:8 dnsmasq-utils to version 0:2.79-19.el8 or higher.
This issue was patched in RHSA-2021:4153.

NVD Description

Note: Versions mentioned in the description apply only to the upstream dnsmasq-utils package and not the dnsmasq-utils package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

A flaw was found in dnsmasq in versions before 2.85. When configured to use a specific server for a given network interface, dnsmasq uses a fixed port while forwarding queries. An attacker on the network, able to find the outgoing port used by dnsmasq, only needs to guess the random transmission ID to forge a reply and get it accepted by dnsmasq. This flaw makes a DNS Cache Poisoning attack much easier. The highest threat from this vulnerability is to data integrity.

CVSS Scores

version 3.1