Ubuntu Security Notice USN-4566-1
October 05, 2020
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 18.04 LTS
Cyrus IMAP Server could be made to overwrite files as the administrator.
– cyrus-imapd: An IMAP server
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)
The problem can be corrected by updating your system to the following
Ubuntu 18.04 LTS:
In general, a standard system update will make all the necessary changes.