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
| Author | Note |
|---|---|
| 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
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 |