=========================================================================Ubuntu Security Notice USN-3810-1
November 06, 2018

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

ppp could be made to crash or bypass authentication if it received
specially crafted network traffic.

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

Details:

Ivan Gotovchits discovered that ppp incorrectly handled the EAP-TLS
protocol. A remote attacker could use this issue to cause ppp to crash,
resulting in a denial of service, or possibly bypass authentication.

Update instructions:

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

Ubuntu 18.04 LTS:
  ppp                             2.4.7-2+2ubuntu1.1

Ubuntu 16.04 LTS:
  ppp                             2.4.7-1+2ubuntu1.16.04.1

Ubuntu 14.04 LTS:
  ppp                             2.4.5-5.1ubuntu2.3

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

References:
  https://ubuntu.com/security/notices/USN-3810-1
  CVE-2018-11574

Package Information:
  https://launchpad.net/ubuntu/+source/ppp/2.4.7-2+2ubuntu1.1
  https://launchpad.net/ubuntu/+source/ppp/2.4.7-1+2ubuntu1.16.04.1
  https://launchpad.net/ubuntu/+source/ppp/2.4.5-5.1ubuntu2.3