cyrus-imapd vulnerabilities

A security issue affects these releases of Ubuntu and its
derivatives:

* Ubuntu 18.04 LTS

Summary

Cyrus IMAP Server could be made to overwrite files as the
administrator.

Software Description

* cyrus-imapd - An IMAP server

Details

It was dicovered that Cyrus IMAP Server could execute arbitrary
code via a crafted HTTP PUT operation for an event with a long
iCalendar property name. An attacker could use this vulnerability
to cause a crash or possibly execute arbitrary code.
(CVE-2019-11356)

It was discovered that the Cyrus IMAP Server allow users to create
any mailbox with administrative privileges. A local attacker could
use this to obtain sensitive information. (CVE-2019-19783)

Update instructions

The problem can be corrected by updating your system to the
following package versions:

Ubuntu 18.04 LTS
cyrus-admin - 2.5.10-3ubuntu1.1
cyrus-caldav - 2.5.10-3ubuntu1.1
cyrus-common - 2.5.10-3ubuntu1.1
cyrus-imapd - 2.5.10-3ubuntu1.1
cyrus-replication - 2.5.10-3ubuntu1.1

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary
changes.

References

* CVE-2019-11356
* CVE-2019-19783

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