Ubuntu alert USN-4456-1 (dovecot)

From:
             
 
Marc Deslauriers <marc.deslauriers@canonical.com> 
To:
             
 
"ubuntu-security-announce@lists.ubuntu.com" <ubuntu-security-announce@lists.ubuntu.com> 
Subject:
             
 
[USN-4456-1] Dovecot vulnerabilities 
Date:
             
 
Wed, 12 Aug 2020 10:54:56 -0400
Message-ID:
             
 
<74cccbcd-06b8-bbe2-0cd8-19200e3bdc3a@canonical.com>
==========================================================================
Ubuntu Security Notice USN-4456-1
August 12, 2020

dovecot vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in Dovecot.

Software Description:
- dovecot: IMAP and POP3 email server

Details:

It was discovered that Dovecot incorrectly handled deeply nested MIME
parts. A remote attacker could possibly use this issue to cause Dovecot to
consume resources, resulting in a denial of service. (CVE-2020-12100)

It was discovered that Dovecot incorrectly handled memory when using NTLM.
A remote attacker could possibly use this issue to cause Dovecot to crash,
resulting in a denial of service. (CVE-2020-12673)

It was discovered that the Dovecot RPA mechanism incorrectly handled
zero-length messages. A remote attacker could possibly use this issue to
cause Dovecot to crash, resulting in a denial of service. (CVE-2020-12674)

Update instructions:

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

Ubuntu 20.04 LTS:
  dovecot-core                    1:2.3.7.2-1ubuntu3.2

Ubuntu 18.04 LTS:
  dovecot-core                    1:2.2.33.2-1ubuntu4.6

Ubuntu 16.04 LTS:
  dovecot-core                    1:2.2.22-1ubuntu2.13

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

References:
  https://usn.ubuntu.com/4456-1
  CVE-2020-12100, CVE-2020-12673, CVE-2020-12674

Package Information:
  https://launchpad.net/ubuntu/+source/dovecot/1:2.3.7.2-1u...
  https://launchpad.net/ubuntu/+source/dovecot/1:2.2.33.2-1...
  https://launchpad.net/ubuntu/+source/dovecot/1:2.2.22-1ub...

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