Debian: DSA-5235-1: bind9 security update

Debian: DSA-5235-1: bind9 security update

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/

Mailing list: [email protected]

https://linuxsecurity.com/advisories/debian/debian-dsa-5235-1-bind9-security-update-09-30-54