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Debian LTS Advisory DLA-3816-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/               Santiago Ruano Rincón
May 17, 2024                                  https://wiki.debian.org/LTS
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Package        : bind9
Version        : 1:9.11.5.P4+dfsg-5.1+deb10u11
CVE ID         : CVE-2023-50387 CVE-2023-50868
Debian Bug     : 

Two vulnerabilities were discovered in BIND, a DNS server implementation, which
may result in denial of service.

CVE-2023-50387

    Certain DNSSEC aspects of the DNS protocol allow remote attackers to cause
    a denial of service via DNSSEC queries. This is known as the "KeyTrap"
    issue.

CVE-2023-50868

    The Closest Encloser Proof aspect of the DNS protocol allows remote
    attackers to cause a denial of service via DNSSEC queries in a random
    subdomain attack. This is known as the "NSEC3" issue.

For Debian 10 buster, these problems have been fixed in version
1:9.11.5.P4+dfsg-5.1+deb10u11.

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 LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS