A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.04 ESM
Several security issues were fixed in Dovecot.
- dovecot: IMAP and POP3 email server
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)
The problem can be corrected by updating your system to the following