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.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Dnsmasq | Thekelleys | * | 2.85 (excluding) |
| Red Hat Enterprise Linux 8 | RedHat | dnsmasq-0:2.79-19.el8 | * |
| Dnsmasq | Ubuntu | bionic | * |
| Dnsmasq | Ubuntu | devel | * |
| Dnsmasq | Ubuntu | esm-infra-legacy/trusty | * |
| Dnsmasq | Ubuntu | esm-infra/xenial | * |
| Dnsmasq | Ubuntu | focal | * |
| Dnsmasq | Ubuntu | groovy | * |
| Dnsmasq | Ubuntu | hirsute | * |
| Dnsmasq | Ubuntu | impish | * |
| Dnsmasq | Ubuntu | jammy | * |
| Dnsmasq | Ubuntu | kinetic | * |
| Dnsmasq | Ubuntu | lunar | * |
| Dnsmasq | Ubuntu | mantic | * |
| Dnsmasq | Ubuntu | noble | * |
| Dnsmasq | Ubuntu | oracular | * |
| Dnsmasq | Ubuntu | precise/esm | * |
| Dnsmasq | Ubuntu | trusty | * |
| Dnsmasq | Ubuntu | trusty/esm | * |
| Dnsmasq | Ubuntu | upstream | * |
| Dnsmasq | Ubuntu | xenial | * |