[USN-4314-1] pam-krb5 vulnerability

[Leonidas S. Barbosa]

==========================================================================
Ubuntu Security Notice USN-4314-1
March 31, 2020

libpam-krb5 vulnerability
==========================================================================

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

- Ubuntu 19.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

pam-krb5 could be made to execute arbitrary code if it received a specially
crafted response.

Software Description:
- libpam-krb5: PAM module for MIT Kerberos

Details:

Russ Allbery discovered that pam-krb5 incorrectly handled some responses.
An attacker could possibly use this issue to execute arbitrary code.

Update instructions:

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

Ubuntu 19.10:
  libpam-krb5                     4.8-2ubuntu0.1

Ubuntu 18.04 LTS:
  libpam-krb5                     4.8-1ubuntu0.1

Ubuntu 16.04 LTS:
  libpam-krb5                     4.7-2ubuntu0.1

Ubuntu 14.04 ESM:
  libpam-krb5                     4.6-2ubuntu0.1~esm1

Ubuntu 12.04 ESM:
  libpam-krb5                     4.5-3ubuntu0.1

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

References:
  https://usn.ubuntu.com/4314-1
  CVE-2020-10595

Package Information:
  https://launchpad.net/ubuntu/+source/libpam-krb5/4.8-2ubuntu0.1
  https://launchpad.net/ubuntu/+source/libpam-krb5/4.8-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/libpam-krb5/4.7-2ubuntu0.1
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