SECURITY

USN-3258-2: Dovecot regression Ubuntu Security Notice USN-3258-2 11th April, 2017 dovecot regression A security issue affects these releases of Ubuntu and its derivatives: Ubuntu 16.10 Ubuntu 16.04 LTS Summary USN-3258-1 introduced a regression in Dovecot. Software description dovecot – IMAP and POP3 email server Details USN-3258-1 intended to fix a vulnerability in Dovecot. Further investigationrevealed that only Dovecot versions 2.2.26 and newer were affected by thevulnerability. Additionally, the change introduced a regression when Dovecotwas configured to use the "dict" authentication database. This update revertsthe change. We apologize for the inconvenience. Original advisory details: It was discovered that Dovecot incorrectly handled some usernames. An attacker could possibly use this issue to cause Dovecot to hang or crash, resulting in a denial of service. Update instructions The problem can be corrected by updating your system to the following package version: Ubuntu 16.10: [ more… ]