Security Bypass Affecting dnsmasq package, versions [,2.85)


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.15% (53rd percentile)

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  • Snyk IDSNYK-UNMANAGED-DNSMASQ-2335695
  • published12 Jan 2022
  • disclosed8 Apr 2021
  • creditUnknown

Introduced: 8 Apr 2021

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

How to fix?

Upgrade dnsmasq to version 2.85 or higher.

Overview

Affected versions of this package are vulnerable to Security Bypass. 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