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Gentoo Linux Security Advisory                           GLSA 202003-62
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: GNU Screen: Buffer overflow
     Date: March 30, 2020
     Bugs: #708460
       ID: 202003-62

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Synopsis
========

A buffer overflow in GNU Screen might allow remote attackers to corrupt
memory.

Background
==========

GNU Screen is a full-screen window manager that multiplexes a physical
terminal between several processes, typically interactive shells.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  app-misc/screen              < 4.8.0                    >= 4.8.0

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

A buffer overflow was found in the way GNU Screen treated the special
escape OSC 49.

Impact
======

A remote attacker, by writing a specially crafted string of characters
to a GNU Screen window, could possibly corrupt memory or have other
unspecified impact.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All GNU Screen users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=app-misc/screen-4.8.0"

References
==========

[ 1 ] CVE-2020-9366
      https://nvd.nist.gov/vuln/detail/CVE-2020-9366

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

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

 https://security.gentoo.org/glsa/202003-62

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


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