USN-4674-1: Dovecot vulnerabilities

Releases

• Ubuntu 20.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

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)

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

• dovecot-core - 1:2.3.7.2-1ubuntu3.3

Ubuntu 18.04

• dovecot-core - 1:2.2.33.2-1ubuntu4.7

Ubuntu 16.04

• dovecot-core - 1:2.2.22-1ubuntu2.14

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

References

• CVE-2020-24386
• CVE-2020-25275

Related notices

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