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Gentoo Linux Security Advisory                           GLSA 202105-05
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                                            https://security.gentoo.org/
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  Severity: Low
     Title: Mutt, NeoMutt: Denial of Service
      Date: May 26, 2021
      Bugs: #788388, #788391
        ID: 202105-05

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Synopsis
=======
A vulnerability in Mutt and NeoMutt could lead to a Denial of Service
condition.

Background
=========
Mutt is a small but very powerful text-based mail client.

NeoMutt is a command line mail reader (or MUA). It's a fork of Mutt
with added features.

Affected packages
================
     -------------------------------------------------------------------
      Package              /     Vulnerable     /            Unaffected
     -------------------------------------------------------------------
   1  mail-client/mutt             < 2.0.7                    >= 2.0.7
   2  mail-client/neomutt       < 20210205-r1           >= 20210205-r1
     -------------------------------------------------------------------
      2 affected packages

Description
==========
It was discovered that Mutt, and NeoMutt did not properly handle
certain situations where an IMAP sequence set ends with a comma.

Impact
=====
A remote attacker could entice a user to connect to a malicious IMAP
server to cause a Denial of Service condition, or other unspecified
impacts.

Workaround
=========
There is no known workaround at this time.

Resolution
=========
All Mutt users should upgrade to the latest version:

   # emerge --sync
   # emerge --ask --oneshot --verbose ">=mail-client/mutt-2.0.7"

All NeoMutt users should upgrade to the latest version:

   # emerge --sync
   # emerge --ask --oneshot -v ">=mail-client/neomutt-20210205-r1"

References
=========
[ 1 ] CVE-2021-32055
       https://nvd.nist.gov/vuln/detail/CVE-2021-32055

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

  https://security.gentoo.org/glsa/202105-05

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 2021 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/