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Ubuntu Security Notice USN-3587-2
April 02, 2018

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

- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in Dovecot.

Software Description:
- dovecot: IMAP and POP3 email server

Details:

USN-3587-1 fixed a vulnerability in Dovecot. This update provides
the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

 It was discovered that Dovecot incorrectly handled parsing certain
 email addresses. A remote attacker could use this issue to cause
 Dovecot to crash, resulting in a denial of service, or possibly obtain
 sensitive information. (CVE-2017-14461)

 It was discovered that Dovecot incorrectly handled TLS SNI config
 lookups. A remote attacker could possibly use this issue to cause
 Dovecot to crash, resulting in a denial of service. (CVE-2017-15130)

Update instructions:

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

Ubuntu 12.04 ESM:
  dovecot-core                    1:2.0.19-0ubuntu2.5

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

References:
  https://usn.ubuntu.com/usn/usn-3587-2
  https://usn.ubuntu.com/usn/usn-3587-1
  CVE-2017-14461, CVE-2017-15130