A pam-krb5 vulnerability security update has been released for Ubuntu Linux 19.10, 18.04 LTS, 16.04 LTS, 14.04 ESM, and 12.04 ESM.

USN-4314-1: pam-krb5 vulnerability

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

libpam-krb5 vulnerability
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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