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Directory Traversal Affecting ruby package, versions <2.5.5-r0

0.0
high

Snyk CVSS

    Attack Complexity High
    Integrity High
    Availability High

    Threat Intelligence

    EPSS 0.49% (76th percentile)
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NVD
7.4 high
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SUSE
7.4 high
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Red Hat
7.4 high

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  • Snyk ID SNYK-ALPINE39-RUBY-449740
  • published 27 Mar 2019
  • disclosed 6 Jun 2019
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Introduced: 27 Mar 2019

CVE-2019-8320 Open this link in a new tab
CWE-22 Open this link in a new tab

How to fix?

Upgrade Alpine:3.9 ruby to version 2.5.5-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream ruby package and not the ruby package as distributed by Alpine. See How to fix? for Alpine:3.9 relevant fixed versions and status.

A Directory Traversal issue was discovered in RubyGems 2.7.6 and later through 3.0.2. Before making new directories or touching files (which now include path-checking code for symlinks), it would delete the target destination. If that destination was hidden behind a symlink, a malicious gem could delete arbitrary files on the user's machine, presuming the attacker could guess at paths. Given how frequently gem is run as sudo, and how predictable paths are on modern systems (/tmp, /usr, etc.), this could likely lead to data loss or an unusable system.