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Loop with Unreachable Exit Condition ('Infinite Loop') Affecting tar package, versions <1.27.1-1ubuntu0.1+esm1

low

Snyk CVSS

    Attack Complexity High
    Availability High

    Threat Intelligence

    EPSS 0.04% (6th percentile)
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NVD
4.7 medium
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Red Hat
5.5 medium
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SUSE
5.5 medium

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  • Snyk ID SNYK-UBUNTU1404-TAR-312296
  • published 26 Dec 2018
  • disclosed 26 Dec 2018
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Introduced: 26 Dec 2018

CVE-2018-20482 Open this link in a new tab
CWE-835 Open this link in a new tab

How to fix?

Upgrade Ubuntu:14.04 tar to version 1.27.1-1ubuntu0.1+esm1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream tar package and not the tar package as distributed by Ubuntu. See How to fix? for Ubuntu:14.04 relevant fixed versions and status.

GNU Tar through 1.30, when --sparse is used, mishandles file shrinkage during read access, which allows local users to cause a denial of service (infinite read loop in sparse_dump_region in sparse.c) by modifying a file that is supposed to be archived by a different user's process (e.g., a system backup running as root).

References