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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade dnsmasqUpgrade dnsmasq-utils | May 4, 2022 | Apr 8, 2021 |
| Alpine Linux | — | Upgrade dnsmasq | Mar 26, 2024 | Apr 8, 2021 |
| Centos_linux | — | Upgrade dnsmasq-debuginfoUpgrade dnsmasq-debugsourceUpgrade dnsmasq-utils-debuginfoUpgrade dnsmasqUpgrade dnsmasq-utils | Nov 10, 2021 | Apr 8, 2021 |
| Debian | — | Upgrade dnsmasq | Jul 30, 2024 | Apr 8, 2021 |
| Freebsd | — | Upgrade dnsmasq-develUpgrade dnsmasq | Mar 18, 2021 | Mar 18, 2021 |
| Gentoo Linux | — | Upgrade net-dns/dnsmasq. | May 28, 2021 | Apr 8, 2021 |
| Huawei Euleros 2_0_sp5 | — | Upgrade dnsmasq-utilsUpgrade dnsmasq | Mar 9, 2023 | Apr 8, 2021 |
| Huawei Euleros 2_0_sp8 | — | Upgrade dnsmasq-utilsUpgrade dnsmasq | Sep 24, 2021 | Apr 8, 2021 |
| Huawei Euleros 2_0_sp9 | — | Upgrade dnsmasq | Aug 10, 2021 | Apr 8, 2021 |
| Oracle_linux | — | Upgrade dnsmasqUpgrade dnsmasq-utils | Jul 22, 2024 | Mar 12, 2021 |
| Redhat_linux | — | No solution existsUpgrade dnsmasq-debuginfoUpgrade dnsmasq-utilsUpgrade dnsmasqUpgrade dnsmasq-debugsourceUpgrade dnsmasq-utils-debuginfo | Nov 10, 2021 | Apr 8, 2021 |
| Rocky_linux | — | Upgrade dnsmasq-utils-debuginfoUpgrade dnsmasqUpgrade dnsmasq-debugsourceUpgrade dnsmasq-utilsUpgrade dnsmasq-debuginfo | Mar 12, 2024 | Apr 8, 2021 |
| Suse | — | Upgrade dnsmasqUpgrade dnsmasq-utils | Oct 28, 2021 | Mar 17, 2021 |
| Ubuntu | — | Upgrade dnsmasq (Ubuntu Pro)Upgrade dnsmasq-utilsUpgrade dnsmasq-utils (Ubuntu Pro)Upgrade dnsmasq-baseUpgrade dnsmasqUpgrade dnsmasq-base (Ubuntu Pro) | Jun 3, 2021 | Mar 17, 2021 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Apr 8, 2021 |
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