USN-3588-1: Memcached vulnerabilities

5 March 2018

memcached vulnerabilities

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

  • Ubuntu 17.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS


Several security issues were fixed in Memcached.

Software Description

  • memcached - high-performance memory object caching system


Daniel Shapira discovered an integer overflow issue in Memcached. A remote attacker could use this to cause a denial of service (daemon crash). (CVE-2017-9951)

It was discovered that Memcached listened to UDP by default. A remote attacker could use this as part of a distributed denial of service attack. (CVE-2018-1000115)

Update instructions

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

Ubuntu 17.10
memcached - 1.4.33-1ubuntu3.2
Ubuntu 16.04 LTS
memcached - 1.4.25-2ubuntu1.3
Ubuntu 14.04 LTS
memcached - 1.4.14-0ubuntu9.2

To update your system, please follow these instructions:

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

Please note that after applying this update, Memcached will no longer listen to UDP by default. If UDP service is desired, please add ‘-U 11211’ to /etc/memcached.conf and restart the memcached service.