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USN-4674-1: Dovecot vulnerabilities

4 January 2021

Several security issues were fixed in Dovecot.

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Releases

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)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

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-imapd, mail-stack-delivery, dovecot-dev, dovecot-pgsql, dovecot-sieve, dovecot-solr, dovecot-core, dovecot-ldap, dovecot-pop3d, dovecot, dovecot-mysql, dovecot-managesieved, dovecot-lmtpd, dovecot-sqlite, dovecot-gssapi