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CVE-2023-2911

Published: 21 June 2023

If the `recursive-clients` quota is reached on a BIND 9 resolver configured with both `stale-answer-enable yes;` and `stale-answer-client-timeout 0;`, a sequence of serve-stale-related lookups could cause `named` to loop and terminate unexpectedly due to a stack overflow. This issue affects BIND 9 versions 9.16.33 through 9.16.41, 9.18.7 through 9.18.15, 9.16.33-S1 through 9.16.41-S1, and 9.18.11-S1 through 9.18.15-S1.

Notes

AuthorNote
alexmurray
As of isc-dhcp-4.4.3-1, isc-dhcp vendors bind9 libs
mdeslaur
per upstream, affects 9.16.33 -> 9.16.41 and 9.18.7 -> 9.18.15

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
bind9
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(1:9.11.3+dfsg-1ubuntu1)
trusty Not vulnerable
(1:9.9.5.dfsg-3)
xenial Not vulnerable
(1:9.10.3.dfsg.P4-8)
focal
Released (1:9.16.1-0ubuntu2.15)
jammy
Released (1:9.18.12-0ubuntu0.22.04.2)
kinetic
Released (1:9.18.12-0ubuntu0.22.10.2)
lunar
Released (1:9.18.12-1ubuntu1.1)
upstream
Released (9.16.42,9.18.16)
Patches:
upstream: https://downloads.isc.org/isc/bind9/9.16.42/patches/0003-CVE-2023-2911.patch
upstream: https://downloads.isc.org/isc/bind9/9.18.16/patches/0003-CVE-2023-2911.patch
isc-dhcp
Launchpad, Ubuntu, Debian
trusty Not vulnerable
(code not present)
xenial Not vulnerable
(code not present)
bionic Needs triage

focal Not vulnerable
(code not present)
jammy Not vulnerable
(code not present)
kinetic Ignored
(end of life, was needs-triage)
lunar Needs triage

upstream Needs triage

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