Debian Security Advisory

DSA-3828-1 dovecot -- security update

Date Reported:
10 Apr 2017
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 860049.
In Mitre's CVE dictionary: CVE-2017-2669.
More information:

It was discovered that the Dovecot email server is vulnerable to a denial of service attack. When the dict passdb and userdb are used for user authentication, the username sent by the IMAP/POP3 client is 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).

For the stable distribution (jessie), this problem has been fixed in version 1:2.2.13-12~deb8u2.

We recommend that you upgrade your dovecot packages.