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Gentoo Linux Security Advisory                           GLSA 201903-05
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: Tar: Denial of Service
     Date: March 10, 2019
     Bugs: #674210
       ID: 201903-05

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Synopsis
========

A vulnerability in Tar could led to a Denial of Service condition.

Background
==========

The Tar program provides the ability to create and manipulate tar
archives.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  app-arch/tar                < 1.30-r1                 >= 1.30-r1 

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

The sparse_dump_region function in sparse.c file in Tar allows an
infinite loop using the --sparse option.

Impact
======

A local attacker could cause a Denial of Service condition by modifying
a file that is supposed to be archived by a different user's process
(e.g., a system backup running as root).

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Tar users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=app-arch/tar-1.30-r1"

References
==========

[ 1 ] CVE-2018-20482
      https://nvd.nist.gov/vuln/detail/CVE-2018-20482

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

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

 https://security.gentoo.org/glsa/201903-05

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 2019 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