CVE-2023-2911

Publication date 21 June 2023

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
bind9	25.04 plucky	Fixed 1:9.18.12-1ubuntu2
	24.10 oracular	Fixed 1:9.18.12-1ubuntu2
	24.04 LTS noble	Fixed 1:9.18.12-1ubuntu2
	23.10 mantic	Fixed 1:9.18.12-1ubuntu2
	23.04 lunar	Fixed 1:9.18.12-1ubuntu1.1
	22.10 kinetic	Fixed 1:9.18.12-0ubuntu0.22.10.2
	22.04 LTS jammy	Fixed 1:9.18.12-0ubuntu0.22.04.2
	20.04 LTS focal	Fixed 1:9.16.1-0ubuntu2.15
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected
bind9-libs	25.04 plucky	Not in release
	24.10 oracular	Not in release
	24.04 LTS noble	Not in release
	23.10 mantic	Not in release
	22.04 LTS jammy	Not affected
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
isc-dhcp	25.04 plucky	Not affected
	24.10 oracular	Not affected
	24.04 LTS noble	Not affected
	23.10 mantic	Not affected
	23.04 lunar	Ignored end of life, was needs-triage
	22.10 kinetic	Ignored end of life, was needs-triage
	22.04 LTS jammy	Not affected
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

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 doesn’t affect 9.11.x in bind9-libs or isc-dhcp

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
bind9	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

Severity score breakdown

Parameter	Value
Base score	7.5 · High
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

References

Related Ubuntu Security Notices (USN)

USN-6183-1
Bind vulnerabilities
21 June 2023