CVE-2024-43167

NameCVE-2024-43167
DescriptionDISPUTE NOTE: this issue does not pose a security risk as it (according to analysis by the original software developer, NLnet Labs) falls within the expected functionality and security controls of the application. Red Hat has made a claim that there is a security risk within Red Hat products. NLnet Labs has no further information about the claim, and suggests that affected Red Hat customers refer to available Red Hat documentation or support channels. ORIGINAL 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-3903-1, ELA-1235-1
Debian Bugs1078647

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
unbound (PTS)jessie, jessie (lts)1.4.22-3+deb8u4vulnerable
stretch1.6.0-3+deb9u2vulnerable
buster, buster (lts)1.9.0-2+deb10u5fixed
buster (security)1.9.0-2+deb10u4vulnerable
bullseye1.13.1-1+deb11u2vulnerable
bullseye (security)1.13.1-1+deb11u4fixed
bookworm (security), bookworm1.17.1-2+deb12u2vulnerable
sid, trixie1.22.0-1fixed
unbound1.9 (PTS)stretch (security)1.9.0-2+deb10u2~deb9u2vulnerable
stretch (lts), stretch1.9.0-2+deb10u2~deb9u4vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
unboundsourcejessie(unfixed)end-of-life
unboundsourcestretch(unfixed)end-of-life
unboundsourcebuster1.9.0-2+deb10u5ELA-1235-1
unboundsourcebullseye1.13.1-1+deb11u3DLA-3903-1
unboundsource(unstable)1.21.1-1unimportant1078647
unbound1.9source(unstable)(unfixed)

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)
Negligible security impact according to upstream

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