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CVE-2023-3341

Published: 20 September 2023

The code that processes control channel messages sent to `named` calls certain functions recursively during packet parsing. Recursion depth is only limited by the maximum accepted packet size; depending on the environment, this may cause the packet-parsing code to run out of available stack memory, causing `named` to terminate unexpectedly. Since each incoming control channel message is fully parsed before its contents are authenticated, exploiting this flaw does not require the attacker to hold a valid RNDC key; only network access to the control channel's configured TCP port is necessary. This issue affects BIND 9 versions 9.2.0 through 9.16.43, 9.18.0 through 9.18.18, 9.19.0 through 9.19.16, 9.9.3-S1 through 9.16.43-S1, and 9.18.0-S1 through 9.18.18-S1.

Notes

AuthorNote
alexmurray
As of isc-dhcp-4.4.3-1, isc-dhcp vendors bind9 libs
mdeslaur
I don't believe this issue applies to the bind9 libs in
isc-dhcp, marking as not-affected

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
bind9
Launchpad, Ubuntu, Debian
bionic
Released (1:9.11.3+dfsg-1ubuntu1.19+esm2)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
focal
Released (1:9.16.1-0ubuntu2.16)
jammy
Released (1:9.18.12-0ubuntu0.22.04.3)
lunar
Released (1:9.18.12-1ubuntu1.2)
mantic
Released (1:9.18.18-0ubuntu2)
noble
Released (1:9.18.18-0ubuntu2)
trusty
Released (1:9.9.5.dfsg-3ubuntu0.19+esm11)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (9.16.44,9.18.19,9.19.17)
xenial
Released (1:9.10.3.dfsg.P4-8ubuntu1.19+esm7)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
isc-dhcp
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Not vulnerable
(code not present)
jammy Not vulnerable
(code not present)
lunar Not vulnerable

mantic Not vulnerable

noble Not vulnerable

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