CVE-2024-43167

Name	CVE-2024-43167
Description	A NULL pointer dereference flaw was found in the ub_ctx_set_fwd function in Unbound. This issue could allow an attacker who can invoke specific sequences of API calls to cause a segmentation fault. When certain API functions such as ub_ctx_set_fwd and ub_ctx_resolvconf are called in a particular order, the program attempts to read from a NULL pointer, leading to a crash. This issue can result in a denial of service by causing the application to terminate unexpectedly.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1078647

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
unbound (PTS)	bullseye (security), bullseye	1.13.1-1+deb11u2	vulnerable
	bookworm, bookworm (security)	1.17.1-2+deb12u2	vulnerable
	sid, trixie	1.20.0-1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
unbound	source	(unstable)	(unfixed)			1078647

Notes

https://bugzilla.redhat.com/show_bug.cgi?id=2303456
https://github.com/NLnetLabs/unbound/issues/1072
https://github.com/NLnetLabs/unbound/pull/1073
Fixed by: https://github.com/NLnetLabs/unbound/commit/8e43e2574c4e02f79c562a061581cdcefe136912 (release-1.21.0rc1)