[ GLSA 201903-05 ] Tar: Denial of Service


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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

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Package / Vulnerable / Unaffected
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1 app-arch/tar 1.30-r1=20

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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