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[SECURITY] [DLA 2328-1] dovecot security update

Debian LTS Advisory DLA-2328-1                debian-lts@lists.debian.org
August 15, 2020                               https://wiki.debian.org/LTS

Package        : dovecot
Version        : 1:2.2.27-3+deb9u6
CVE ID         : CVE-2020-12100 CVE-2020-12673 CVE-2020-12674
Debian Bug     : 968302

Several vulnerabilities have been discovered in the Dovecot email


    Receiving mail with deeply nested MIME parts leads to resource
    exhaustion as Dovecot attempts to parse it.


    Dovecot's NTLM implementation does not correctly check message
    buffer size, which leads to a crash when reading past allocation.


    Dovecot's RPA mechanism implementation accepts zero-length message,
    which leads to assert-crash later on.

For Debian 9 stretch, these problems have been fixed in version

We recommend that you upgrade your dovecot packages.

For the detailed security status of dovecot please refer to
its security tracker page at:

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

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