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Gentoo Linux Security Advisory                           GLSA 202105-09
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                                            https://security.gentoo.org/
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  Severity: Low
     Title: BusyBox: Denial of service
      Date: May 26, 2021
      Bugs: #777255
        ID: 202105-09

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Synopsis
========

A vulnerability in BusyBox might allow remote attackers to cause a
Denial of Service condition.

Background
==========

BusyBox is a set of tools for embedded systems and is a replacement for
GNU Coreutils.

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

     -------------------------------------------------------------------
      Package              /     Vulnerable     /            Unaffected
     -------------------------------------------------------------------
   1  sys-apps/busybox             < 1.32.1                  >= 1.32.1

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

It was discovered that BusyBox mishandled the error bit on the
huft_build result pointer when decompressing GZIP compressed data.

Impact
======

A remote attacker could entice a user to open a specially crafted GZIP
file using BusyBox, possibly resulting in a Denial of Service
condition.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All BusyBox users should upgrade to the latest version:

   # emerge --sync
   # emerge --ask --oneshot --verbose ">=sys-apps/busybox-1.32.1"

References
==========

[ 1 ] CVE-2021-28831
       https://nvd.nist.gov/vuln/detail/CVE-2021-28831

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

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

  https://security.gentoo.org/glsa/202105-09

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