[USN-4674-1] Dovecot vulnerabilities

Marc Deslauriers marc.deslauriers at canonical.com
Mon Jan 4 16:01:18 UTC 2021

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


Several security issues were fixed in Dovecot.

Software Description:
- dovecot: IMAP and POP3 email server


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:

Ubuntu 20.04 LTS:
  dovecot-core                    1:

Ubuntu 18.04 LTS:
  dovecot-core                    1:

Ubuntu 16.04 LTS:
  dovecot-core                    1:2.2.22-1ubuntu2.14

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

  CVE-2020-24386, CVE-2020-25275

Package Information:

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