CVE-2022-3094
Published: 25 January 2023
Sending a flood of dynamic DNS updates may cause `named` to allocate large amounts of memory. This, in turn, may cause `named` to exit due to a lack of free memory. We are not aware of any cases where this has been exploited. Memory is allocated prior to the checking of access permissions (ACLs) and is retained during the processing of a dynamic update from a client whose access credentials are accepted. Memory allocated to clients that are not permitted to send updates is released immediately upon rejection. The scope of this vulnerability is limited therefore to trusted clients who are permitted to make dynamic zone changes. If a dynamic update is REFUSED, memory will be released again very quickly. Therefore it is only likely to be possible to degrade or stop `named` by sending a flood of unaccepted dynamic updates comparable in magnitude to a query flood intended to achieve the same detrimental outcome. BIND 9.11 and earlier branches are also affected, but through exhaustion of internal resources rather than memory constraints. This may reduce performance but should not be a significant problem for most servers. Therefore we don't intend to address this for BIND versions prior to BIND 9.16. This issue affects BIND 9 versions 9.16.0 through 9.16.36, 9.18.0 through 9.18.10, 9.19.0 through 9.19.8, and 9.16.8-S1 through 9.16.36-S1.
Notes
Author | Note |
---|---|
alexmurray | As of isc-dhcp-4.4.3-1, isc-dhcp vendors bind9 libs |
mdeslaur | bind 9.11 and earlier will exhaust internal resources before exhausting memory constraints so this CVE is not a significant issue in 9.11 and earlier and will not be fixed by upstream or by Ubuntu. |
Priority
Status
Package | Release | Status |
---|---|---|
bind9 Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
|
focal |
Released
(1:9.16.1-0ubuntu2.12)
|
|
jammy |
Released
(1:9.18.1-1ubuntu1.3)
|
|
kinetic |
Released
(1:9.18.4-2ubuntu2.1)
|
|
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
(4.4.3-2ubuntu4)
|
|
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 |