Debian: DSA-3828-1: dovecot security update

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

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Debian Security Advisory DSA-3828-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
https://www.debian.org/security/                     Salvatore Bonaccorso
April 10, 2017                        https://www.debian.org/security/faq
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Package        : dovecot
CVE ID         : CVE-2017-2669
Debian Bug     : 860049

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.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

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