A bind9 security update has been released for Debian GNU/Linux 11 to address several vulnerabilities.
DSA 5235-1: bind9 security update
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Debian Security Advisory DSA-5235-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
September 22, 2022 https://www.debian.org/security/faq
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Package : bind9
CVE ID : CVE-2022-2795 CVE-2022-3080 CVE-2022-38177 CVE-2022-38178
Several vulnerabilities were discovered in BIND, a DNS server
implementation.
CVE-2022-2795
Yehuda Afek, Anat Bremler-Barr and Shani Stajnrod discovered that a
flaw in the resolver code can cause named to spend excessive amounts
of time on processing large delegations, significantly degrade
resolver performance and result in denial of service.
CVE-2022-3080
Maksym Odinintsev discovered that the resolver can crash when stale
cache and stale answers are enabled with a zero
stale-answer-timeout. A remote attacker can take advantage of this
flaw to cause a denial of service (daemon crash) via specially
crafted queries to the resolver.
CVE-2022-38177
It was discovered that the DNSSEC verification code for the ECDSA
algorithm is susceptible to a memory leak flaw. A remote attacker
can take advantage of this flaw to cause BIND to consume resources,
resulting in a denial of service.
CVE-2022-38178
It was discovered that the DNSSEC verification code for the EdDSA
algorithm is susceptible to a memory leak flaw. A remote attacker
can take advantage of this flaw to cause BIND to consume resources,
resulting in a denial of service.
For the stable distribution (bullseye), these problems have been fixed in
version 1:9.16.33-1~deb11u1.
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/
