A heimdal security update has been released for Debian GNU/Linux 10 LTS to fix accidentally inverted important memory comparisons in the arcfour-hmac-md5 and rc4-hmac integrity check handlers.

DLA 3311-1: heimdal security update

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Debian LTS Advisory DLA-3311-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Helmut Grohne
February 08, 2023   https://wiki.debian.org/LTS
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Package : heimdal
Version : 7.5.0+dfsg-3+deb10u2
CVE ID : CVE-2022-45142
Debian Bug : #1030849

I discovered a flaw in Heimdal, an implementation of Kerberos 5 that
aims to be compatible with MIT Kerberos. The backports of fixes for
CVE-2022-3437 accidentally inverted important memory comparisons in the
arcfour-hmac-md5 and rc4-hmac integrity check handlers for gssapi,
resulting in incorrect validation of message integrity codes.

For Debian 10 buster, this problem has been fixed in version
7.5.0+dfsg-3+deb10u2.

We recommend that you upgrade your heimdal packages.

For the detailed security status of heimdal please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/heimdal

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