USN-3258-2: Dovecot regression

Releases

• Ubuntu 16.10
• Ubuntu 16.04 ESM

Packages

• dovecot - IMAP and POP3 email server

Details

USN-3258-1 intended to fix a vulnerability in Dovecot. Further investigation
revealed that only Dovecot versions 2.2.26 and newer were affected by the
vulnerability. Additionally, the change introduced a regression when Dovecot
was configured to use the "dict" authentication database. This update reverts
the change. We apologize for the inconvenience.

Original advisory details:

It was discovered that Dovecot incorrectly handled some usernames. An attacker
could possibly use this issue to cause Dovecot to hang or crash, resulting in a
denial of service.

Update instructions

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

Ubuntu 16.10

• dovecot-core - 1:2.2.24-1ubuntu1.3

Ubuntu 16.04

• dovecot-core - 1:2.2.22-1ubuntu2.4

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

References

• CVE-2017-2669

Related notices

• USN-3258-1: dovecot-mysql, dovecot-solr, dovecot-pgsql, dovecot-lucene, dovecot-pop3d, dovecot-dev, mail-stack-delivery, dovecot-imapd, dovecot-lmtpd, dovecot-ldap, dovecot-managesieved, dovecot-sieve, dovecot, dovecot-gssapi, dovecot-core, dovecot-sqlite