Vulnerability · Published Sep 23, 2022 · Assigned by mitre
CVE-2022-40188
High 7.5
In plain English
A high-severity security flaw in the knot-resolver package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.9% (higher than 80% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)1.9%top 19.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Knot Resolver before 5.5.3 allows remote attackers to cause a denial of service (CPU consumption) because of algorithmic complexity. During an attack, an authoritative server must return large NS sets or address sets.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | knot-resolver | 5.5.3-r0 | ALPINE-CVE-2022-40188 |
| Alpine:v3.21 | knot-resolver | 5.5.3-r0 | ALPINE-CVE-2022-40188 |
| Alpine:v3.22 | knot-resolver | 5.5.3-r0 | ALPINE-CVE-2022-40188 |
| Alpine:v3.23 | knot-resolver | 5.5.3-r0 | ALPINE-CVE-2022-40188 |
| Alpine:v3.24 | knot-resolver | 5.5.3-r0 | ALPINE-CVE-2022-40188 |
| Debian:12 | knot-resolver | 5.5.3-1 | DEBIAN-CVE-2022-40188 |
| Debian:13 | knot-resolver | 5.5.3-1 | DEBIAN-CVE-2022-40188 |
| Debian:14 | knot-resolver | 5.5.3-1 | DEBIAN-CVE-2022-40188 |
Affected products (as reported)
Weakness: CWE-407 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://gitlab.nic.cz/knot/knot-resolver/-/merge_requests/1343#note_262558
- FEDORA-2022-68ad89b21c vendor-advisory
- FEDORA-2022-357cc1a81b vendor-advisory
- FEDORA-2022-2a4ca7b18d vendor-advisory
- [debian-lts-announce] 20221008 [SECURITY] [DLA 3139-1] knot-resolver security update mailing-list