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Debian Security Advisory DSA-5620-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
February 14, 2024                     https://www.debian.org/security/faq
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Package        : unbound
CVE ID         : CVE-2023-50387 CVE-2023-50868
Debian Bug     : 1063845

Two vulnerabilities were discovered in unbound, a validating, recursive,
caching DNS resolver. Specially crafted DNSSEC answers could lead
unbound down a very CPU intensive and time costly DNSSEC
(CVE-2023-50387) or NSEC3 hash (CVE-2023-50868) validation path,
resulting in denial of service.

Details can be found at
https://nlnetlabs.nl/downloads/unbound/CVE-2023-50387_CVE-2023-50868.txt

For the oldstable distribution (bullseye), these problems have been fixed
in version 1.13.1-1+deb11u2.

For the stable distribution (bookworm), these problems have been fixed in
version 1.17.1-2+deb12u2.

We recommend that you upgrade your unbound packages.

For the detailed security status of unbound please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/source-package/unbound

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org