Several security issues were fixed in Dovecot.
USN-3556-1 fixed vulnerabilities in Dovecot. This update provides the corresponding update for Ubuntu 12.04 ESM.
1 February 2018
A security issue affects these releases of Ubuntu and its derivatives:
Several security issues were fixed in Dovecot.
USN-3556-1 fixed vulnerabilities in Dovecot. This update provides the corresponding update for Ubuntu 12.04 ESM.
It was discovered that Dovecot incorrectly handled certain authentications. An attacker could possibly use this to bypass authentication and access sensitive information. (CVE-2013-6171)
Original advisory details:
It was discovered that Dovecot incorrectly handled certain authentications. An attacker could possibly use this to cause a denial of service. (CVE-2017-15132)
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.
Vulmon