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USN-4674-1: Dovecot vulnerabilities

4 January 2021

Several security issues were fixed in Dovecot.



  • 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
Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04

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

Related notices

  • USN-4674-2: dovecot-ldap, dovecot-dev, dovecot-lmtpd, dovecot-sqlite, mail-stack-delivery, dovecot-core, dovecot-mysql, dovecot-gssapi, dovecot-pop3d, dovecot-pgsql, dovecot-solr, dovecot-sieve, dovecot-managesieved, dovecot-imapd, dovecot