Debian: DSA-5235-1: bind9 security update
Summary
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/source-package/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/
