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Gentoo Linux Security Advisory                           GLSA 202310-13
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                                           https://security.gentoo.org/
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 Severity: High
    Title: GNU Mailutils: unexpected processsing of escape sequences
     Date: October 19, 2023
     Bugs: #802867
       ID: 202310-13

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Synopsis
========

A vulnerability has been discovered in Mailutils where escape sequences
are processed in a context where this may lead to RCE.

Background
==========

GNU Mailutils is a collection of mail-related utilities, including an
IMAP4 server (imap4d) and a Mail User Agent (mail).

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

Package             Vulnerable    Unaffected
------------------  ------------  ------------
net-mail/mailutils  < 3.12-r3     >= 3.12-r3

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

A vulnerability has been discovered in GNU Mailutils. Please review the
CVE identifier referenced below for details.

Impact
======

mail(1) from mailutils would process escape sequences (like ~!
shellcommand) in message bodies piped/redirected in. This creates an RCE
if some part of the message body is under an attacker's control.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Mailutils users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=net-mail/mailutils-3.12-r3"

References
==========

[ 1 ] CVE-2021-32749
      https://nvd.nist.gov/vuln/detail/CVE-2021-32749

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

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

 https://security.gentoo.org/glsa/202310-13

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 2023 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/