[USN-5959-1] Kerberos vulnerabilities

[Nishit Majithia]

==========================================================================
Ubuntu Security Notice USN-5959-1
March 16, 2023

krb5 vulnerabilities
==========================================================================

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in Kerberos.

Software Description:
- krb5: MIT Kerberos Network Authentication Protocol

Details:

It was discovered that Kerberos incorrectly handled memory when processing
KDC data, which could lead to a NULL pointer dereference. An attacker could
possibly use this issue to cause a denial of service or have other
unspecified impacts. (CVE-2021-36222, CVE-2021-37750)

Update instructions:

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

Ubuntu 20.04 LTS:
  krb5-k5tls                      1.17-6ubuntu4.3
  krb5-kdc                        1.17-6ubuntu4.3
  krb5-kdc-ldap                   1.17-6ubuntu4.3
  krb5-pkinit                     1.17-6ubuntu4.3

Ubuntu 18.04 LTS:
  krb5-k5tls                      1.16-2ubuntu0.4
  krb5-kdc                        1.16-2ubuntu0.4
  krb5-kdc-ldap                   1.16-2ubuntu0.4
  krb5-pkinit                     1.16-2ubuntu0.4

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-5959-1
  CVE-2021-36222, CVE-2021-37750

Package Information:
  https://launchpad.net/ubuntu/+source/krb5/1.17-6ubuntu4.3
  https://launchpad.net/ubuntu/+source/krb5/1.16-2ubuntu0.4
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