=========================================================================Ubuntu Security Notice USN-3951-1
April 23, 2019
dovecot vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 19.04
- Ubuntu 18.10
Summary:
Dovecot could be made to crash if it received specially crafted network
traffic.
Software Description:
- dovecot: IMAP and POP3 email server
Details:
It was discovered that the Dovecot JSON encoder incorrectly handled certain
invalid UTF-8 characters. A remote attacker could possibly use this issue
to cause Dovecot to repeatedly crash, resulting in a denial of service.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 19.04:
dovecot-core 1:2.3.4.1-1ubuntu2.1
Ubuntu 18.10:
dovecot-core 1:2.3.2.1-1ubuntu3.3
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-3951-1
CVE-2019-10691
Package Information:
https://launchpad.net/ubuntu/+source/dovecot/1:2.3.4.1-1ubuntu2.1
https://launchpad.net/ubuntu/+source/dovecot/1:2.3.2.1-1ubuntu3.3