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Debian Security Advisory DSA-4752-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
August 27, 2020                       https://www.debian.org/security/faq
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Package        : bind9
CVE ID         : CVE-2020-8619 CVE-2020-8622 CVE-2020-8623 CVE-2020-8624
Debian Bug     : 966497

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

CVE-2020-8619

    It was discovered that an asterisk character in an empty non-
    terminal can cause an assertion failure, resulting in denial
    of service.

CVE-2020-8622

    Dave Feldman, Jeff Warren, and Joel Cunningham reported that a
    truncated TSIG response can lead to an assertion failure, resulting
    in denial of service.

CVE-2020-8623

    Lyu Chiy reported that a flaw in the native PKCS#11 code can lead
    to a remotely triggerable assertion failure, resulting in denial
    of service.

CVE-2020-8624

    Joop Boonen reported that update-policy rules of type "subdomain"
    are enforced incorrectly, allowing updates to all parts of the zone
    along with the intended subdomain.

For the stable distribution (buster), these problems have been fixed in
version 1:9.11.5.P4+dfsg-5.1+deb10u2.

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: debian-security-announce@lists.debian.org