Debian: DSA-4130-1 Critical: Dovecot Memory Leak and DoS Issues

CVE-2017-14461

Aleksandar Nikolic of Cisco Talos and 'flxflndy' discovered that
Dovecot does not properly parse invalid email addresses, which may
cause a crash or leak memory contents to an attacker.

CVE-2017-15130

It was discovered that TLS SNI config lookups may lead to excessive
memory usage, causing imap-login/pop3-login VSZ limit to be reached
and the process restarted, resulting in a denial of service. Only
Dovecot configurations containing local_name { } or local { }
configuration blocks are affected.

CVE-2017-15132

It was discovered that Dovecot contains a memory leak flaw in the
login process on aborted SASL authentication.

For the oldstable distribution (jessie), these problems have been fixed
in version 1:2.2.13-12~deb8u4.

For the stable distribution (stretch), these problems have been fixed in
version 1:2.2.27-3+deb9u2.

We recommend that you upgrade your dovecot packages.

For the detailed security status of dovecot please refer to its security
track...