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Ubuntu 16.04 LTS/16.10: USN-3258-2 Dovecot Regression Fix - DOS

ubuntu
Calendar Grey April 11, 2017
Dist Ubuntu Esm H88
The Ubuntu Security Notice USN-3258-2 details the Dovecot vulnerability, including affected versions and guidance for needed updates to secure your system
USN-3258-1 introduced a regression in Dovecot.

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 investigation

revealed that only Dovecot versions 2.2.26 and newer were affected by the

vulnerability. Additionally, the change introduced a regression when Dovecot

was configured to use the "dict" authentication database. This update reverts

the 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.

Topics%20covered

Topics Covered

security advisory denial of service software fix ubuntu dovecot

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.10:
  dovecot-core                    1:2.2.24-1ubuntu1.3

Ubuntu 16.04 LTS:
  dovecot-core                    1:2.2.22-1ubuntu2.4

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-3258-2

https://ubuntu.com/security/notices/USN-3258-1

CVE-2017-2669

Severity
critical
Lowest
Low
Medium
High
Critical

April 11, 2017

Topics%20covered

Topics Covered

security advisory denial of service software fix ubuntu dovecot

Package Information

https://launchpad.net/ubuntu/+source/dovecot/1:2.2.24-1ubuntu1.3
https://launchpad.net/ubuntu/+source/dovecot/1:2.2.22-1ubuntu2.4

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