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From: Marc Deslauriers
Reply-To: Ubuntu Security
To: "ubuntu-security-announce@lists.ubuntu.com"
Message-ID: <793ad9e6-4fa8-9751-3ce5-5b19a2ca0cc0@canonical.com>
Subject: [USN-4674-1] Dovecot vulnerabilities
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==========================================================================
Ubuntu Security Notice USN-4674-1
January 04, 2021
dovecot vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.10
- 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 certain imap hibernation
commands. A remote authenticated attacker could possibly use this issue to
access other users' email. This issue only affected Ubuntu 18.04 LTS,
Ubuntu 20.04 LTS, and Ubuntu 20.10. (CVE-2020-24386)
Innokentii Sennovskiy discovered that Dovecot incorrectly handled MIME
parsing. A remote attacker could possibly use this issue to cause Dovecot
to crash, resulting in a denial of service. (CVE-2020-25275)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.10:
dovecot-core 1:2.3.11.3+dfsg1-2ubuntu0.1
Ubuntu 20.04 LTS:
dovecot-core 1:2.3.7.2-1ubuntu3.3
Ubuntu 18.04 LTS:
dovecot-core 1:2.2.33.2-1ubuntu4.7
Ubuntu 16.04 LTS:
dovecot-core 1:2.2.22-1ubuntu2.14
In general, a standard system update will make all the necessary changes.
References:
https://usn.ubuntu.com/4674-1
CVE-2020-24386, CVE-2020-25275
Package Information:
https://launchpad.net/ubuntu/+source/dovecot/1:2.3.11.3+dfsg1-2ubuntu0.1
https://launchpad.net/ubuntu/+source/dovecot/1:2.3.7.2-1ubuntu3.3
https://launchpad.net/ubuntu/+source/dovecot/1:2.2.33.2-1ubuntu4.7
https://launchpad.net/ubuntu/+source/dovecot/1:2.2.22-1ubuntu2.14
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