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Fedora Update Notification
FEDORA-2020-b8ebc4201e
2020-09-25 16:31:57.888497
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Name : dovecot
Product : Fedora 33
Version : 2.3.11.3
Release : 5.fc33
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-2020-12100: Parsing mails with a large number of MIME parts could
have resulted in excessive CPU usage or a crash due to running out of
stack memory. CVE-2020-12673: Dovecot’s NTLM implementation does not
correctly check message buffer size, which leads to reading past
allocation which can lead to crash. 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. CVE-2020-12674:
Dovecot’s RPA mechanism implementation accepts zero-length message, which
leads to assert-crash later on.
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ChangeLog:

* Wed Sep 2 2020 Michal Hlavinka <mhlavink@redhat.com> – 1:2.3.11.3-5
– fix gssapi issue
* Wed Aug 26 2020 Michal Hlavinka <mhlavink@redhat.com> – 1:2.3.11.3-4
– fix FTBFS on 32bit systems
* Mon Aug 17 2020 Jeff Law <law@redhat.com> – 1:2.3.11.3-2
– Disable LTO
* Sat Aug 15 2020 Michal Hlavinka <mhlavink@redhat.com> – 1:2.3.11.3-1
– CVE-2020-12100: Parsing mails with a large number of MIME parts could
have resulted in excessive CPU usage or a crash due to running out of
stack memory.
– CVE-2020-12673: Dovecot’s NTLM implementation does not correctly check
message buffer size, which leads to reading past allocation which can
lead to crash.
– 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.
– CVE-2020-12674: Dovecot’s RPA mechanism implementation accepts
zero-length message, which leads to assert-crash later on.
* Sat Aug 1 2020 Fedora Release Engineering <releng@fedoraproject.org> – 1:2.3.10.1-3
– Second attempt – Rebuilt for
https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild
* Mon Jul 27 2020 Fedora Release Engineering <releng@fedoraproject.org> – 1:2.3.10.1-2
– Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild
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References:

[ 1 ] Bug #1868539 – CVE-2020-12100 dovecot: Resource exhaustion via deeply nested MIME parts [fedora-all]
https://bugzilla.redhat.com/show_bug.cgi?id=1868539
[ 2 ] Bug #1868540 – CVE-2020-12673 dovecot: Out of bound reads in dovecot NTLM implementation [fedora-all]
https://bugzilla.redhat.com/show_bug.cgi?id=1868540
[ 3 ] Bug #1868541 – CVE-2020-12674 dovecot: Crash due to assert in RPA implementation [fedora-all]
https://bugzilla.redhat.com/show_bug.cgi?id=1868541
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This update can be installed with the “dnf” update program. Use
su -c ‘dnf upgrade –advisory FEDORA-2020-b8ebc4201e’ 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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