A bind9 security update has been released for Debian GNU/Linux 11 and 12 to address several vulnerabilities.

[SECURITY] [DSA 5504-1] bind9 security update

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Debian Security Advisory DSA-5504-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
September 22, 2023 https://www.debian.org/security/faq
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Package : bind9
CVE ID : CVE-2023-3341 CVE-2023-4236
Debian Bug : 1052416 1052417

Several vulnerabilities were discovered in BIND, a DNS server
implementation.

CVE-2023-3341

A stack exhaustion flaw was discovered in the control channel code
which may result in denial of service (named daemon crash).

CVE-2023-4236

Robert Story discovered that a flaw in the networking code handling
DNS-over-TLS queries could cause named to terminate unexpectedly due
to an assertion failure, resulting in denial of service when under
high DNS-over-TLS query load conditions.

For the oldstable distribution (bullseye), these problems have been fixed
in version 1:9.16.44-1~deb11u1. The oldstable distribution (bullseye) is
only affected by CVE-2023-3341.

For the stable distribution (bookworm), these problems have been fixed in
version 1:9.18.19-1~deb12u1.

We recommend that you upgrade your bind9 packages.

For the detailed security status of bind9 please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/bind9

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/