Debian Security Advisory

DLA-3311-1 heimdal -- LTS security update

Date Reported:
08 Feb 2023
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 1030849.
In Mitre's CVE dictionary: CVE-2022-45142.
More information:

Helmut Grohne 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:

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: