vulnerability

Red Hat: CVE-2021-3448: CVE-2021-3448 dnsmasq: fixed outgoing port used when --server is used with an interface name (Multiple Advisories)

Severity
4
CVSS
(AV:N/AC:M/Au:N/C:N/I:P/A:N)
Published
Apr 8, 2021
Added
Nov 10, 2021
Modified
Jul 9, 2025

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)

no-fix-redhat-rpm-packageredhat-upgrade-dnsmasqredhat-upgrade-dnsmasq-debuginforedhat-upgrade-dnsmasq-debugsourceredhat-upgrade-dnsmasq-utilsredhat-upgrade-dnsmasq-utils-debuginfo
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