Loop with Unreachable Exit Condition ('Infinite Loop') Affecting tar package, versions <1.28-2.1ubuntu0.2


Severity

Recommended
low

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.04% (5th percentile)

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  • Snyk IDSNYK-UBUNTU1604-TAR-312297
  • published26 Dec 2018
  • disclosed26 Dec 2018

Introduced: 26 Dec 2018

CVE-2018-20482  (opens in a new tab)
CWE-835  (opens in a new tab)

How to fix?

Upgrade Ubuntu:16.04 tar to version 1.28-2.1ubuntu0.2 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:16.04 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).

CVSS Scores

version 3.1