Fedora 31: FEDORA-2020-b60344c987 Critical DoS Advisory for Dovecot

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.

- 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.

* Mon May 18 2020 Michal Hlavinka - 1:2.3.10.1-1

- dovecot updated to 2.3.10.1

- fixes CVE-2020-10967, CVE-2020-10958, CVE-2020-10957

[ 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

su -c 'dnf upgrade --advisory FEDORA-2020-b60344c987' at the command

line. For more information, refer to the dnf documentation available at

https://dnf.readthedocs.io/en/latest/command_ref.html

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/security/

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