CVE-2019-19331 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....
HighCVSS 7.5
EPSS 2.1%
- Published
- Updated
- Exploit status
- No public exploit known
Description
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).
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| debian/knot-resolver(Debian:12) | < 5.0.1-1 | 5.0.1-1 |
| debian/knot-resolver(Debian:13) | < 5.0.1-1 | 5.0.1-1 |
| debian/knot-resolver(Debian:14) | < 5.0.1-1 | 5.0.1-1 |
| nic Knot Resolver | < 4.3.0 | 4.3.0 |
| debian linux | = 10.0 | No fix listed |
| alpine/knot-resolver(Alpine:v3.11) | < 4.3.0-r0 | 4.3.0-r0 |
| alpine/knot-resolver(Alpine:v3.12) | < 4.3.0-r0 | 4.3.0-r0 |
| alpine/knot-resolver(Alpine:v3.13) | < 4.3.0-r0 | 4.3.0-r0 |
| alpine/knot-resolver(Alpine:v3.14) | < 4.3.0-r0 | 4.3.0-r0 |
| alpine/knot-resolver(Alpine:v3.15) | < 4.3.0-r0 | 4.3.0-r0 |
| alpine/knot-resolver(Alpine:v3.16) | < 4.3.0-r0 | 4.3.0-r0 |
| alpine/knot-resolver(Alpine:v3.17) | < 4.3.0-r0 | 4.3.0-r0 |
| alpine/knot-resolver(Alpine:v3.18) | < 4.3.0-r0 | 4.3.0-r0 |
| alpine/knot-resolver(Alpine:v3.19) | < 4.3.0-r0 | 4.3.0-r0 |
| alpine/knot-resolver(Alpine:v3.20) | < 4.3.0-r0 | 4.3.0-r0 |
| alpine/knot-resolver(Alpine:v3.21) | < 4.3.0-r0 | 4.3.0-r0 |
| alpine/knot-resolver(Alpine:v3.22) | < 4.3.0-r0 | 4.3.0-r0 |
| alpine/knot-resolver(Alpine:v3.23) | < 4.3.0-r0 | 4.3.0-r0 |
| alpine/knot-resolver(Alpine:v3.24) | < 4.3.0-r0 | 4.3.0-r0 |
| CZ.NIC knot-resolver | = 4.3.0 | No fix listed |
References
- Debian Security Tracker CVE-2019-19331 vendor-advisory
- bugzilla.redhat.com exploit issue-tracking patch
- [debian-lts-announce] 20240426 [SECURITY] [DLA 3795-1] knot-resolver security update mailing-list
- www.knot-resolver.cz release-notes vendor-advisory
- security.alpinelinux.org vendor-advisory
- bugs.debian.org issue-tracking