[ GLSA 202007-56 ] Claws Mail: Improper STARTTLS handling

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Gentoo Linux Security Advisory                           GLSA 202007-56
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: Claws Mail: Improper STARTTLS handling
     Date: July 28, 2020
     Bugs: #733684
       ID: 202007-56

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Synopsis
========

A vulnerability was discovered in Claws Mail's STARTTLS handling,
possibly allowing an integrity/confidentiality compromise.

Background
==========

Claws Mail is a GTK based e-mail client.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  mail-client/claws-mail       < 3.17.6                  >= 3.17.6

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

It was discovered that Claws Mail was not properly handling state
within the STARTTLS protocol handshake.

Impact
======

There may be a breach of integrity or confidentiality in connections
made using Claws Mail with STARTTLS.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Claws Mail users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=mail-client/claws-mail-3.17.6"

References
==========

[ 1 ] CVE-2020-15917
      https://nvd.nist.gov/vuln/detail/CVE-2020-15917

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

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

 https://security.gentoo.org/glsa/202007-56

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
[email protected] 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

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