USN-4674-1: Dovecot vulnerabilities

Publication date

4 January 2021

Overview

Several security issues were fixed in Dovecot.


Packages

  • 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)

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

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
20.10 groovy dovecot-core –  1:2.3.11.3+dfsg1-2ubuntu0.1
20.04 focal dovecot-core –  1:2.3.7.2-1ubuntu3.3
18.04 bionic dovecot-core –  1:2.2.33.2-1ubuntu4.7
16.04 xenial dovecot-core –  1:2.2.22-1ubuntu2.14

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