USN-4456-1: Dovecot vulnerabilities

Releases

• 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 deeply nested MIME
parts. A remote attacker could possibly use this issue to cause Dovecot to
consume resources, resulting in a denial of service. (CVE-2020-12100)

It was discovered that Dovecot incorrectly handled memory when using NTLM.
A remote attacker could possibly use this issue to cause Dovecot to crash,
resulting in a denial of service. (CVE-2020-12673)

It was discovered that the Dovecot RPA mechanism incorrectly handled
zero-length messages. A remote attacker could possibly use this issue to
cause Dovecot to crash, resulting in a denial of service. (CVE-2020-12674)

Update instructions

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

Ubuntu 20.04

• dovecot-core - 1:2.3.7.2-1ubuntu3.2

Ubuntu 18.04

• dovecot-core - 1:2.2.33.2-1ubuntu4.6

Ubuntu 16.04

• dovecot-core - 1:2.2.22-1ubuntu2.13

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

References

• CVE-2020-12100
• CVE-2020-12674
• CVE-2020-12673

Related notices

• USN-4456-2: dovecot-sqlite, dovecot-ldap, dovecot-solr, dovecot-pop3d, dovecot-lmtpd, dovecot-dev, dovecot-pgsql, dovecot, dovecot-sieve, dovecot-core, dovecot-managesieved, mail-stack-delivery, dovecot-imapd, dovecot-gssapi, dovecot-mysql