==========================================================================
Ubuntu Security Notice USN-5800-1
January 12, 2023

heimdal vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in Heimdal.

Software Description:
- heimdal: Heimdal Kerberos Network Authentication Protocol

Details:

It was discovered that Heimdal incorrectly handled certain SPNEGO tokens. A
remote attacker could possibly use this issue to cause a denial of service.
(CVE-2021-44758)

Evgeny Legerov discovered that Heimdal incorrectly handled memory when
performing certain DES decryption operations. A remote attacker could use
this issue to cause a denial of service, or possibly execute arbitrary
code. (CVE-2022-3437)

Greg Hudson discovered that Kerberos PAC implementation used in Heimdal
incorrectly handled certain parsing operations. A remote attacker could use
this issue to cause a denial of service, or possibly execute arbitrary
code. (CVE-2022-42898)

It was discovered that Heimdal's KDC did not properly handle certain error
conditions. A remote attacker could use this issue to cause a denial of
service, or possibly execute arbitrary code. (CVE-2022-44640)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS:
   libasn1-8-heimdal               7.7.0+dfsg-1ubuntu1.3
   libgssapi3-heimdal              7.7.0+dfsg-1ubuntu1.3
   libhdb9-heimdal                 7.7.0+dfsg-1ubuntu1.3
   libhx509-5-heimdal              7.7.0+dfsg-1ubuntu1.3
   libkrb5-26-heimdal              7.7.0+dfsg-1ubuntu1.3

Ubuntu 18.04 LTS:
   libasn1-8-heimdal               7.5.0+dfsg-1ubuntu0.3
   libgssapi3-heimdal              7.5.0+dfsg-1ubuntu0.3
   libhdb9-heimdal                 7.5.0+dfsg-1ubuntu0.3
   libhx509-5-heimdal              7.5.0+dfsg-1ubuntu0.3
   libkrb5-26-heimdal              7.5.0+dfsg-1ubuntu0.3

Ubuntu 16.04 ESM:
   libasn1-8-heimdal               1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3
   libgssapi3-heimdal              1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3
   libhdb9-heimdal                 1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3
   libhx509-5-heimdal              1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3
   libkrb5-26-heimdal              1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3

Ubuntu 14.04 ESM:
   libasn1-8-heimdal               1.6~git20131207+dfsg-1ubuntu1.2+esm3
   libgssapi3-heimdal              1.6~git20131207+dfsg-1ubuntu1.2+esm3
   libhdb9-heimdal                 1.6~git20131207+dfsg-1ubuntu1.2+esm3
   libhx509-5-heimdal              1.6~git20131207+dfsg-1ubuntu1.2+esm3
   libkrb5-26-heimdal              1.6~git20131207+dfsg-1ubuntu1.2+esm3

After a standard system update you need to restart any application
using Heimdal libraries to make all the necessary changes.

References:
   https://ubuntu.com/security/notices/USN-5800-1
   CVE-2021-44758, CVE-2022-3437, CVE-2022-42898, CVE-2022-44640

Package Information:
   https://launchpad.net/ubuntu/+source/heimdal/7.7.0+dfsg-1ubuntu1.3
   https://launchpad.net/ubuntu/+source/heimdal/7.5.0+dfsg-1ubuntu0.3