Cyrus IMAP: Multiple vulnerabilities

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.3440
               USN-4566-1: Cyrus IMAP Server vulnerabilities
                              6 October 2020

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        AusCERT Security Bulletin Summary
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Product:           Cyrus IMAP
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Increased Privileges            -- Existing Account      
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-19783 CVE-2019-11356 

Reference:         ESB-2019.4746
                   ESB-2019.2627
                   ESB-2019.2056

Original Bulletin: 
   https://usn.ubuntu.com/4566-1/

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USN-4566-1: Cyrus IMAP Server vulnerabilities
05 October 2020

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

  o Ubuntu 18.04 LTS

Packages

  o 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

  o cyrus-admin - 2.5.10-3ubuntu1.1
  o cyrus-caldav - 2.5.10-3ubuntu1.1
  o cyrus-common - 2.5.10-3ubuntu1.1
  o cyrus-imapd - 2.5.10-3ubuntu1.1
  o cyrus-replication - 2.5.10-3ubuntu1.1

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

References

  o CVE-2019-11356
  o CVE-2019-19783

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