CVE-2019-8320 Information

Description

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.

CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H

Reference

http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html https://access.redhat.com/errata/RHSA-2019:1429 https://blog.rubygems.org/2019/03/05/security-advisories-2019-03.html https://hackerone.com/reports/317321 https://lists.debian.org/debian-lts-announce/2020/08/msg00027.html

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.4