Ubuntu 14.04 LTS USN-2213-1 Moderate: Dovecot Denial Of Service

ubuntu

May 15, 2014

Dovecot could be made to stop responding if it received specially crafted network traffic.

Summary

Dovecot could be made to stop responding if it received specially crafted

network traffic.

Software Description:

- dovecot: IMAP and POP3 email server

Details:

It was discovered that Dovecot incorrectly handled closing inactive SSL/TLS

connections. A remote attacker could use this issue to cause Dovecot to

stop responding to new connections, resulting in a denial of service.

Topics Covered

security advisory moderate denial of service software update network traffic ubuntu dovecot

Update Instructions

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

Ubuntu 14.04 LTS:
  dovecot-core                    1:2.2.9-1ubuntu2.1
  dovecot-imapd                   1:2.2.9-1ubuntu2.1
  dovecot-pop3d                   1:2.2.9-1ubuntu2.1

Ubuntu 13.10:
  dovecot-core                    1:2.1.7-7ubuntu3.1
  dovecot-imapd                   1:2.1.7-7ubuntu3.1
  dovecot-pop3d                   1:2.1.7-7ubuntu3.1

Ubuntu 12.10:
  dovecot-core                    1:2.1.7-1ubuntu2.1
  dovecot-imapd                   1:2.1.7-1ubuntu2.1
  dovecot-pop3d                   1:2.1.7-1ubuntu2.1

Ubuntu 12.04 LTS:
  dovecot-core                    1:2.0.19-0ubuntu2.1
  dovecot-imapd                   1:2.0.19-0ubuntu2.1
  dovecot-pop3d                   1:2.0.19-0ubuntu2.1

Ubuntu 10.04 LTS:
  dovecot-imapd                   1:1.2.9-1ubuntu6.6
  dovecot-pop3d                   1:1.2.9-1ubuntu6.6

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