=========================================================================Ubuntu Security Notice USN-1143-1
June 02, 2011

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

- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS

Summary:

An attacker could send a crafted email message that could disrupt email
service.

Software Description:
- dovecot: IMAP and POP3 email server

Details:

It was discovered that the message header parser in Dovecot did not
properly handle '\0' characters in header names. This could allow a
remote attacker to cause a denial of service through a crafted email
message by crashing the Dovecot daemon or corrupting mailboxes.

Update instructions:

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

Ubuntu 11.04:
  dovecot-common                  1:1.2.15-3ubuntu2.1

Ubuntu 10.10:
  dovecot-common                  1:1.2.12-1ubuntu8.2

Ubuntu 10.04 LTS:
  dovecot-common                  1:1.2.9-1ubuntu6.4

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

References:
  CVE-2011-1929

Package Information:
  https://launchpad.net/ubuntu/+source/dovecot/1:1.2.15-3ubuntu2.1
  https://launchpad.net/ubuntu/+source/dovecot/1:1.2.12-1ubuntu8.2
  https://launchpad.net/ubuntu/+source/dovecot/1:1.2.9-1ubuntu6.4