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CVE-2022-2795

Published: 21 September 2022

By flooding the target resolver with queries exploiting this flaw an attacker can significantly impair the resolver's performance, effectively denying legitimate clients access to the DNS resolution service.

Notes

AuthorNote
alexmurray
As of isc-dhcp-4.4.3-1, isc-dhcp vendors bind9 libs
mdeslaur
This is unlikely to affect isc-dhcp's use of bind9-libs and the
vendored bind9 libs, marking as negligible

Priority

Medium

Cvss 3 Severity Score

5.3

Score breakdown

Status

Package Release Status
bind9
Launchpad, Ubuntu, Debian
bionic
Released (1:9.11.3+dfsg-1ubuntu1.18)
focal
Released (1:9.16.1-0ubuntu2.11)
jammy
Released (1:9.18.1-1ubuntu1.2)
kinetic
Released (1:9.18.4-2ubuntu2)
lunar
Released (1:9.18.4-2ubuntu2)
mantic
Released (1:9.18.4-2ubuntu2)
noble
Released (1:9.18.4-2ubuntu2)
trusty
Released (1:9.9.5.dfsg-3ubuntu0.19+esm7)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (9.16.33,9.18.7,9.19.5)
xenial
Released (1:9.10.3.dfsg.P4-8ubuntu1.19+esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
Patches:
upstream: https://gitlab.isc.org/isc-projects/bind9/-/commit/e2014ba9e3b4236b0384ba17abfb2c9a155412f6
upstream: https://gitlab.isc.org/isc-projects/bind9/-/commit/bf2ea6d8525bfd96a84dad221ba9e004adb710a8
bind9-libs
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Needs triage

jammy Needs triage

mantic Does not exist

noble Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

isc-dhcp
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
focal Not vulnerable
(code not present)
jammy Not vulnerable
(code not present)
kinetic Ignored
(end of life, was needed)
lunar Ignored
(end of life, was needed)
mantic Ignored
(end of life, was needed)
noble Needed

trusty Not vulnerable
(code not present)
upstream Needs triage

xenial Not vulnerable
(code not present)

Severity score breakdown

Parameter Value
Base score 5.3
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact Low
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L