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Fedora Update Notification
FEDORA-2020-b60344c987
2020-05-28 01:59:14.571867
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Name : dovecot
Product : Fedora 31
Version : 2.3.10.1
Release : 1.fc31
URL : http://www.dovecot.org/
Summary : Secure imap and pop3 server
Description :
Dovecot is an IMAP server for Linux/UNIX-like systems, written with security
primarily in mind. It also contains a small POP3 server. It supports mail
in either of maildir or mbox formats.

The SQL drivers and authentication plug-ins are in their subpackages.

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Update Information:

– CVE-2020-10957: lmtp/submission: A client can crash the server by sending a
NOOP command with an invalid string parameter. This occurs particularly for a
parameter that doesn’t start with a double quote. This applies to all SMTP
services, including submission-login, which makes it possible to crash the
submission service without authentication. – CVE-2020-10958: lmtp/submission:
Sending many invalid or unknown commands can cause the server to access freed
memory, which can lead to a server crash. This happens when the server closes
the connection with a “421 Too many invalid commands” error. The bad command
limit depends on the service (lmtp or submission) and varies between 10 to
20 bad commands. – CVE-2020-10967: lmtp/submission: Issuing the RCPT command
with an address that has the empty quoted string as local-part causes the
lmtp service to crash.
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ChangeLog:

* Mon May 18 2020 Michal Hlavinka <mhlavink@redhat.com> – 1:2.3.10.1-1
– dovecot updated to 2.3.10.1
– fixes CVE-2020-10967, CVE-2020-10958, CVE-2020-10957
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References:

[ 1 ] Bug #1834317 – CVE-2020-10957 dovecot: malformed NOOP commands leads to DoS
https://bugzilla.redhat.com/show_bug.cgi?id=1834317
[ 2 ] Bug #1834323 – CVE-2020-10958 dovecot: command followed by sufficient number of newlines leads to use-after-free
https://bugzilla.redhat.com/show_bug.cgi?id=1834323
[ 3 ] Bug #1834326 – CVE-2020-10967 dovecot: sending mail with empty quoted localpart leads to DoS
https://bugzilla.redhat.com/show_bug.cgi?id=1834326
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This update can be installed with the “dnf” update program. Use
su -c ‘dnf upgrade –advisory FEDORA-2020-b60344c987’ at the command
line. For more information, refer to the dnf documentation available at
http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

All packages are signed with the Fedora Project GPG key. More details on the
GPG keys used by the Fedora Project can be found at
https://fedoraproject.org/keys
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