dnsmasq: A flaw was found in dnsmasq before version 2.83
CVE-2020-25686 is fixed in 4 products on 1 platform, first by dnsmasq 2.79-1ubuntu0.2, released January 18, 2021. It is not reported as exploited. Patch Radar priority: Routine.
A flaw was found in dnsmasq before version 2.83. When receiving a query,dnsmasq does not check for an existing pending request for the same nameand forwards a new request. By default, a maximum of 150 pending queriescan be sent to upstream servers, so there can be at most 150 queries forthe same name. This flaw allows an off-path attacker on the network tosubstantially reduce the number of attempts that it would have to performto forge a reply and have it accepted by dnsmasq. This issue is mentionedin the "Birthday Attacks" section of RFC5452. If chained withCVE-2020-25684, the attack complexity of a successful attack is reduced.The highest threat from this vulnerability is to data integrity.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| dnsmasq · RHEL 8 | 0:2.79-13.el8_3.1 | RHSA-2021:0150 | Jan 19, 2021 |
| dnsmasq · Ubuntu 18.04.6 LTS (bionic) | 2.79-1ubuntu0.2 | dnsmasq 2.79-1ubuntu0.2 | Jan 18, 2021 |
| dnsmasq · Ubuntu 20.04 LTS (focal) | 2.80-1.1ubuntu1.2 | dnsmasq 2.80-1.1ubuntu1.2 | Jan 18, 2021 |
| dnsmasq · Ubuntu 24.10 (oracular) | 2.82-1ubuntu2 | dnsmasq 2.82-1ubuntu2 | Jan 19, 2021 |
| dnsmasq · Ubuntu 25.04 (plucky) | 2.82-1ubuntu2 | dnsmasq 2.82-1ubuntu2 | Jan 19, 2021 |
| dnsmasq · ol 8 | 0:2.79-13.el8_3.1 | ELSA-2021-0150 | Jan 20, 2021 |
| dnsmasq-base · Ubuntu 18.04.6 LTS (bionic) | 2.79-1ubuntu0.2 | dnsmasq-base 2.79-1ubuntu0.2 | Jan 18, 2021 |
| dnsmasq-base · Ubuntu 20.04 LTS (focal) | 2.80-1.1ubuntu1.2 | dnsmasq-base 2.80-1.1ubuntu1.2 | Jan 18, 2021 |
| dnsmasq-base · Ubuntu 24.10 (oracular) | 2.82-1ubuntu2 | dnsmasq-base 2.82-1ubuntu2 | Jan 19, 2021 |
| dnsmasq-base · Ubuntu 25.04 (plucky) | 2.82-1ubuntu2 | dnsmasq-base 2.82-1ubuntu2 | Jan 19, 2021 |
| dnsmasq-base-lua · Ubuntu 18.04.6 LTS (bionic) | 2.79-1ubuntu0.2 | dnsmasq-base-lua 2.79-1ubuntu0.2 | Jan 18, 2021 |
| dnsmasq-base-lua · Ubuntu 20.04 LTS (focal) | 2.80-1.1ubuntu1.2 | dnsmasq-base-lua 2.80-1.1ubuntu1.2 | Jan 18, 2021 |
| dnsmasq-base-lua · Ubuntu 24.10 (oracular) | 2.82-1ubuntu2 | dnsmasq-base-lua 2.82-1ubuntu2 | Jan 19, 2021 |
| dnsmasq-base-lua · Ubuntu 25.04 (plucky) | 2.82-1ubuntu2 | dnsmasq-base-lua 2.82-1ubuntu2 | Jan 19, 2021 |
| dnsmasq-utils · RHEL 8 | 0:2.79-13.el8_3.1 | RHSA-2021:0150 | Jan 19, 2021 |
| dnsmasq-utils · Ubuntu 18.04.6 LTS (bionic) | 2.79-1ubuntu0.2 | dnsmasq-utils 2.79-1ubuntu0.2 | Jan 18, 2021 |
| dnsmasq-utils · Ubuntu 20.04 LTS (focal) | 2.80-1.1ubuntu1.2 | dnsmasq-utils 2.80-1.1ubuntu1.2 | Jan 18, 2021 |
| dnsmasq-utils · Ubuntu 24.10 (oracular) | 2.82-1ubuntu2 | dnsmasq-utils 2.82-1ubuntu2 | Jan 19, 2021 |
| dnsmasq-utils · Ubuntu 25.04 (plucky) | 2.82-1ubuntu2 | dnsmasq-utils 2.82-1ubuntu2 | Jan 19, 2021 |
| dnsmasq-utils · ol 8 | 0:2.79-13.el8_3.1 | ELSA-2021-0150 | Jan 20, 2021 |
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