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CVE-2021-3448

CVE-2021-3448

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 4.0 · Medium · EPSS 2.3% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • dnsmasq

    Versions
    • dnsmasq 2.85: Affected

    No fix published

  • dnsmasq Debian:12

    Affected ranges
    • ECOSYSTEM: < 2.85-1

    Update to 2.85-1

  • dnsmasq Debian:13

    Affected ranges
    • ECOSYSTEM: < 2.85-1

    Update to 2.85-1

  • dnsmasq Debian:14

    Affected ranges
    • ECOSYSTEM: < 2.85-1

    Update to 2.85-1

  • dnsmasq Ubuntu:Pro:14.04:LTS

    Versions
    • 2.66-4ubuntu1
    • 2.67-1
    • 2.68-1
    • 2.68-1ubuntu0.1
    • 2.68-1ubuntu0.2
    • 2.68-1ubuntu0.2+esm1
    • 2.68-1ubuntu0.2+esm2
    • 2.68-1ubuntu0.2+esm3
    • 2.68-1ubuntu0.2+esm5
    • 2.68-1ubuntu0.2+esm6
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • dnsmasq Ubuntu:Pro:16.04:LTS

    Versions
    • 2.75-1
    • 2.75-1ubuntu0.16.04.1
    • 2.75-1ubuntu0.16.04.2
    • 2.75-1ubuntu0.16.04.3
    • 2.75-1ubuntu0.16.04.4
    • 2.75-1ubuntu0.16.04.5
    • 2.75-1ubuntu0.16.04.7
    • 2.75-1ubuntu0.16.04.8
    • 2.75-1ubuntu0.16.04.10
    • 2.75-1ubuntu0.16.04.10+esm1
    Affected ranges
    • ECOSYSTEM: < 2.79-1ubuntu0.16.04.1+esm1

    Update to 2.79-1ubuntu0.16.04.1+esm1

  • dnsmasq Ubuntu:18.04:LTS

    Versions
    • 2.78-1
    • 2.78-3
    • 2.79-1
    • 2.79-1ubuntu0.2
    • 2.79-1ubuntu0.3
    Affected ranges
    • ECOSYSTEM: < 2.79-1ubuntu0.4

    Update to 2.79-1ubuntu0.4

  • dnsmasq Ubuntu:20.04:LTS

    Versions
    • 2.80-1ubuntu2
    • 2.80-1ubuntu4
    • 2.80-1.1ubuntu1
    • 2.80-1.1ubuntu1.2
    • 2.80-1.1ubuntu1.3
    Affected ranges
    • ECOSYSTEM: < 2.80-1.1ubuntu1.4

    Update to 2.80-1.1ubuntu1.4

Original sources

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