CVE-2023-4408

Name	CVE-2023-4408
Description	The DNS message parsing code in `named` includes a section whose computational complexity is overly high. It does not cause problems for typical DNS traffic, but crafted queries and responses may cause excessive CPU load on the affected `named` instance by exploiting this flaw. This issue affects both authoritative servers and recursive resolvers. This issue affects BIND 9 versions 9.0.0 through 9.16.45, 9.18.0 through 9.18.21, 9.19.0 through 9.19.19, 9.9.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.45-S1, and 9.18.11-S1 through 9.18.21-S1.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DSA-5621-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
bind9 (PTS)	bullseye	1:9.16.50-1~deb11u2	fixed
	bullseye (security)	1:9.16.50-1~deb11u4	fixed
	bookworm	1:9.18.33-1~deb12u2	fixed
	bookworm (security)	1:9.18.41-1~deb12u1	fixed
	trixie	1:9.20.11-4	fixed
	trixie (security)	1:9.20.15-1~deb13u1	fixed
	forky, sid	1:9.20.15-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin
bind9	source	bullseye	1:9.16.48-1	DSA-5621-1
bind9	source	bookworm	1:9.18.24-1	DSA-5621-1
bind9	source	(unstable)	1:9.19.21-1

Notes

https://kb.isc.org/docs/cve-2023-4408
https://gitlab.isc.org/isc-projects/bind9/-/commit/770bb71ce7d934d2461a719af76bee3803145811 (v9.16.48)
https://gitlab.isc.org/isc-projects/bind9/-/commit/0bbb0065e63c3231b320bd20d1121aed6c4d00d8 (v9.16.48)
https://gitlab.isc.org/isc-projects/bind9/-/commit/f397ff5bb81413004fa6367f63a833fe70a3ac59 (v9.16.48)