Improperly Implemented Security Check for Standard Affecting dnsmasq package, versions <2.85-1ubuntu1


Severity

Recommended
low

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.15% (53rd percentile)

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  • Snyk IDSNYK-UBUNTU2204-DNSMASQ-2784961
  • published23 Mar 2021
  • disclosed8 Apr 2021

Introduced: 23 Mar 2021

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

How to fix?

Upgrade Ubuntu:22.04 dnsmasq to version 2.85-1ubuntu1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream dnsmasq package and not the dnsmasq package as distributed by Ubuntu. See How to fix? for Ubuntu:22.04 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