CVE-2023-26249
Published: 21 February 2023
Knot Resolver before 5.6.0 enables attackers to consume its resources, launching amplification attacks and potentially causing a denial of service. Specifically, a single client query may lead to a hundred TCP connection attempts if a DNS server closes connections without providing a response.
Priority
Status
Package | Release | Status |
---|---|---|
knot-resolver Launchpad, Ubuntu, Debian |
bionic |
Needed
|
focal |
Needed
|
|
jammy |
Needed
|
|
trusty |
Ignored
(end of standard support)
|
|
upstream |
Released
(5.6.0-1, 5.6.0)
|
|
kinetic |
Ignored
(end of life, was needed)
|
|
xenial |
Needed
|
|
lunar |
Not vulnerable
(5.6.0-1)
|
|
mantic |
Not vulnerable
(5.6.0-1)
|
|
Patches: upstream: https://gitlab.nic.cz/knot/knot-resolver/-/merge_requests/1380/commits |
Severity score breakdown
Parameter | Value |
---|---|
Base score | 7.5 |
Attack vector | Network |
Attack complexity | Low |
Privileges required | None |
User interaction | None |
Scope | Unchanged |
Confidentiality | None |
Integrity impact | None |
Availability impact | High |
Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |