ppp could be made to crash if it received specially crafted network traffic.
It was discovered that ppp incorrectly handled large PIDs. When pppd is used with a RADIUS server, a remote attacker could use this issue to cause it to crash, resulting in a denial of service.
5 May 2015
A security issue affects these releases of Ubuntu and its derivatives:
ppp could be made to crash if it received specially crafted network traffic.
It was discovered that ppp incorrectly handled large PIDs. When pppd is used with a RADIUS server, a remote attacker could use this issue to cause it to crash, resulting in a denial of service.
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.