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Ubuntu: (Multiple Advisories) (CVE-2021-3448): Dnsmasq vulnerability

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Ubuntu: (Multiple Advisories) (CVE-2021-3448): Dnsmasq vulnerability

Severity
4
CVSS
(AV:N/AC:M/Au:N/C:N/I:P/A:N)
Published
03/17/2021
Created
06/04/2021
Added
06/03/2021
Modified
09/08/2022

Description

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.

Solution(s)

  • ubuntu-upgrade-dnsmasq
  • ubuntu-upgrade-dnsmasq-base
  • ubuntu-upgrade-dnsmasq-utils

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