CVE-2017-2669

Published: 10 April 2017

Dovecot before version 2.2.29 is vulnerable to a denial of service. When 'dict' passdb and userdb were used for user authentication, the username sent by the IMAP/POP3 client was sent through var_expand() to perform %variable expansion. Sending specially crafted %variable fields could result in excessive memory usage causing the process to crash (and restart), or excessive CPU usage causing all authentications to hang.

Priority

Medium

CVSS 3 base score: 7.5

Status

Package Release Status
dovecot
Launchpad, Ubuntu, Debian
Upstream Needed

Ubuntu 16.04 LTS (Xenial Xerus) Not vulnerable

Ubuntu 14.04 ESM (Trusty Tahr) Not vulnerable
(1:2.2.9-1ubuntu2.1)
Ubuntu 12.04 ESM (Precise Pangolin) Not vulnerable

Patches:
Upstream: https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735