dnsmasq: A flaw was found in dnsmasq before version 2.83
CVE-2020-25681 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: High.
A flaw was found in dnsmasq before version 2.83. A heap-based bufferoverflow was discovered in the way RRSets are sorted before validating withDNSSEC data. An attacker on the network, who can forge DNS replies such asthat they are accepted as valid, could use this flaw to cause a bufferoverflow with arbitrary data in a heap memory segment, possibly executingcode on the machine. The highest threat from this vulnerability is to dataconfidentiality and integrity as well as system availability.
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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