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Gentoo Linux Security Advisory                           GLSA 202006-23
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: Cyrus IMAP Server: Access restriction bypass
     Date: June 15, 2020
     Bugs: #703630
       ID: 202006-23

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Synopsis
========

An error in Cyrus IMAP Server allows mailboxes to be created with
administrative privileges.

Background
==========

The Cyrus IMAP Server is an efficient, highly-scalable IMAP e-mail
server.

Affected packages
=================

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  net-mail/cyrus-imapd         < 3.0.13                  >= 3.0.13 

Description
===========

An issue was discovered in Cyrus IMAP Server where sieve script
uploading is excessively trusted.

Impact
======

A user can use a sieve script to create any mailbox with administrator
privileges.

Workaround
==========

Disable sieve script uploading until the upgrade is complete.

Resolution
==========

All Cyrus IMAP Server users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=net-mail/cyrus-imapd-3.0.13"

References
==========

[ 1 ] CVE-2019-19783
      https://nvd.nist.gov/vuln/detail/CVE-2019-19783

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

 https://security.gentoo.org/glsa/202006-23

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2020 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5