CVE-2023-2828
Published: 21 June 2023
Every `named` instance configured to run as a recursive resolver maintains a cache database holding the responses to the queries it has recently sent to authoritative servers. The size limit for that cache database can be configured using the `max-cache-size` statement in the configuration file; it defaults to 90% of the total amount of memory available on the host. When the size of the cache reaches 7/8 of the configured limit, a cache-cleaning algorithm starts to remove expired and/or least-recently used RRsets from the cache, to keep memory use below the configured limit. It has been discovered that the effectiveness of the cache-cleaning algorithm used in `named` can be severely diminished by querying the resolver for specific RRsets in a certain order, effectively allowing the configured `max-cache-size` limit to be significantly exceeded. This issue affects BIND 9 versions 9.11.0 through 9.16.41, 9.18.0 through 9.18.15, 9.19.0 through 9.19.13, 9.11.3-S1 through 9.16.41-S1, and 9.18.11-S1 through 9.18.15-S1.
Notes
Author | Note |
---|---|
alexmurray | As of isc-dhcp-4.4.3-1, isc-dhcp vendors bind9 libs |
Priority
Status
Package | Release | Status |
---|---|---|
bind9 Launchpad, Ubuntu, Debian |
bionic |
Released
(1:9.11.3+dfsg-1ubuntu1.19+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
trusty |
Released
(1:9.9.5.dfsg-3ubuntu0.19+esm10)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
xenial |
Released
(1:9.10.3.dfsg.P4-8ubuntu1.19+esm6)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
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
(9.16.42,9.18.16,9.19.14)
|
|
Patches: upstream: https://downloads.isc.org/isc/bind9/9.16.42/patches/0001-CVE-2023-2828.patch upstream: https://downloads.isc.org/isc/bind9/9.18.16/patches/0001-CVE-2023-2828.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 |