CVE-2022-3924
Published: 25 January 2023
This issue can affect BIND 9 resolvers with `stale-answer-enable yes;` that also make use of the option `stale-answer-client-timeout`, configured with a value greater than zero. If the resolver receives many queries that require recursion, there will be a corresponding increase in the number of clients that are waiting for recursion to complete. If there are sufficient clients already waiting when a new client query is received so that it is necessary to SERVFAIL the longest waiting client (see BIND 9 ARM `recursive-clients` limit and soft quota), then it is possible for a race to occur between providing a stale answer to this older client and sending an early timeout SERVFAIL, which may cause an assertion failure. This issue affects BIND 9 versions 9.16.12 through 9.16.36, 9.18.0 through 9.18.10, 9.19.0 through 9.19.8, and 9.16.12-S1 through 9.16.36-S1.
Notes
Author | Note |
---|---|
alexmurray |
As of isc-dhcp-4.4.3-1, isc-dhcp vendors bind9 libs |
mdeslaur |
This issue was introduced in 9.16.12 |
Priority
Status
Package | Release | Status |
---|---|---|
bind9
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(1:9.11.3+dfsg-1ubuntu1.18)
|
focal |
Not vulnerable
(1:9.16.1-0ubuntu2.11)
|
|
jammy |
Released
(1:9.18.1-1ubuntu1.3)
|
|
kinetic |
Released
(1:9.18.4-2ubuntu2.1)
|
|
lunar |
Released
(1:9.18.11-2ubuntu1)
|
|
trusty |
Not vulnerable
|
|
upstream |
Released
(9.16.37,9.18.11,9.19.9)
|
|
xenial |
Not vulnerable
|
|
isc-dhcp
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(code not present)
|
focal |
Not vulnerable
(code not present)
|
|
jammy |
Not vulnerable
(code not present)
|
|
kinetic |
Not vulnerable
(code not present)
|
|
lunar |
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 |