CVE-2021-3448 Affecting dnsmasq package, versions <2.78-150000.3.14.1


Severity

Recommended
low

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.15% (53rd percentile)

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  • Snyk IDSNYK-SLES150-DNSMASQ-2774059
  • published22 Apr 2022
  • disclosed21 Apr 2022

Introduced: 21 Apr 2022

CVE-2021-3448  (opens in a new tab)

How to fix?

Upgrade SLES:15.0 dnsmasq to version 2.78-150000.3.14.1 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 SLES. See How to fix? for SLES:15.0 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