Ubuntu Security Notice 3556-1 - It was discovered that Dovecot incorrectly handled certain authentications. An attacker could possibly use this to cause a denial of service.
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Ubuntu Security Notice USN-3556-1
February 01, 2018
dovecot vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 17.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
Summary:
Dovecot could be made to crash if it received specially crafted input.
Software Description:
- dovecot: IMAP and POP3 email server
Details:
It was discovered that Dovecot incorrectly handled certain
authentications. An attacker could possibly use this to cause a denial
of service.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 17.10:
dovecot-core 1:2.2.27-3ubuntu1.2
Ubuntu 16.04 LTS:
dovecot-core 1:2.2.22-1ubuntu2.6
Ubuntu 14.04 LTS:
dovecot-core 1:2.2.9-1ubuntu2.3
In general, a standard system update will make all the necessary
changes.
References:
https://www.ubuntu.com/usn/usn-3556-1
CVE-2017-15132
Package Information:
https://launchpad.net/ubuntu/+source/dovecot/1:2.2.27-3ubuntu1.2
https://launchpad.net/ubuntu/+source/dovecot/1:2.2.22-1ubuntu2.6
https://launchpad.net/ubuntu/+source/dovecot/1:2.2.9-1ubuntu2.3