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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
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