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USN-4456-1: Dovecot vulnerabilities

12 August 2020

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 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)

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 20.04
Ubuntu 18.04
Ubuntu 16.04

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

Related notices

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