CVE-2023-6516
Published: 13 February 2024
To keep its cache database efficient, `named` running as a recursive resolver occasionally attempts to clean up the database. It uses several methods, including some that are asynchronous: a small chunk of memory pointing to the cache element that can be cleaned up is first allocated and then queued for later processing. It was discovered that if the resolver is continuously processing query patterns triggering this type of cache-database maintenance, `named` may not be able to handle the cleanup events in a timely manner. This in turn enables the list of queued cleanup events to grow infinitely large over time, allowing the configured `max-cache-size` limit to be significantly exceeded. This issue affects BIND 9 versions 9.16.0 through 9.16.45 and 9.16.8-S1 through 9.16.45-S1.
Notes
| Author | Note |
|---|---|
| alexmurray | As of isc-dhcp-4.4.3-1, isc-dhcp vendors bind9 libs |
| mdeslaur | only affects 9.16.x |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
bind9 Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
|
| focal |
Released
(1:9.16.48-0ubuntu0.20.04.1)
|
|
| jammy |
Not vulnerable
(1:9.18.18-0ubuntu0.22.04.1)
|
|
| mantic |
Not vulnerable
(1:9.18.18-0ubuntu2)
|
|
| noble |
Not vulnerable
(1:9.18.21-0ubuntu1)
|
|
| trusty |
Not vulnerable
|
|
| upstream |
Released
(9.16.48,9.18.24,9.19.21)
|
|
| xenial |
Not vulnerable
|
|
|
Patches: upstream: https://ftp.isc.org/isc/bind9/9.16.48/patches/0004-CVE-2023-6516.patch |
||
|
bind9-libs Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| focal |
Not vulnerable
(code not present)
|
|
| jammy |
Not vulnerable
(code not present)
|
|
| 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 |
Needs triage
|
| focal |
Not vulnerable
(code not present)
|
|
| jammy |
Not vulnerable
(code not present)
|
|
| mantic |
Not vulnerable
(code not present)
|
|
| noble |
Not vulnerable
(code not present)
|
|
| trusty |
Not vulnerable
(code not present)
|
|
| upstream |
Needs triage
|
|
| xenial |
Not vulnerable
(code not present)
|
|
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 |