A ppp security update has been released for Ubuntu Linux 14.04 ESM and 12.04 ESM.

USN-4451-2: ppp vulnerability

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Ubuntu Security Notice USN-4451-2
August 06, 2020

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

- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

ppp could be made to load arbitrary kernel modules and possibly run
programs.

Software Description:
- ppp: Point-to-Point Protocol (PPP)

Details:

USN-4451-1 fixed a vulnerability in ppp. This update provides
the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory details:

Thomas Chauchefoin discovered that ppp incorrectly handled module loading.
A local attacker could use this issue to load arbitrary kernel modules and
possibly execute arbitrary code.

Update instructions:

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

Ubuntu 14.04 ESM:
ppp 2.4.5-5.1ubuntu2.3+esm2

Ubuntu 12.04 ESM:
ppp 2.4.5-5ubuntu1.4

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

References:
  https://usn.ubuntu.com/4451-2
  https://usn.ubuntu.com/4451-1
CVE-2020-15704