knot-resolver: knot-resolver before version 4.3.0 is vulnerable to denial of service through high CPU utilization
CVE-2019-19331 is fixed in 2 products on 1 platform, first by knot-resolver 3.2.1-3ubuntu2.2, released May 19, 2020. It is not reported as exploited. Patch Radar priority: Routine.
knot-resolver before version 4.3.0 is vulnerable to denial of service through high CPU utilization. DNS replies with very many resource records might be processed very inefficiently, in extreme cases taking even several CPU seconds for each such uncached message. For example, a few thousand A records can be squashed into one DNS message (limit is 64kB).
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| knot-resolver · Ubuntu 20.04 LTS (focal) | 3.2.1-3ubuntu2.2 | knot-resolver 3.2.1-3ubuntu2.2 | May 19, 2020 |
| knot-resolver-module-http · Ubuntu 20.04 LTS (focal) | 3.2.1-3ubuntu2.2 | knot-resolver-module-http 3.2.1-3ubuntu2.2 | May 19, 2020 |
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