PT-2020-15828 · Openzfs · Openzfs

Published 2020-08-27 · Updated 2020-09-04 · CVE-2020-24717

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions OpenZFS versions prior to 2.0.0-rc1

Description The issue misinterprets group permissions as user permissions, as demonstrated by mode 0770 being equivalent to mode 0777, leading to a disruption in access control. This occurs due to a critical flaw in the code added to OpenZFS for FreeBSD support, where group rights are processed as owner rights.

Recommendations For OpenZFS versions prior to 2.0.0-rc1, update to version 2.0.0-rc1 or later to resolve the issue. As a temporary workaround, consider restricting access to sensitive files and directories to minimize the risk of exploitation.

Exploit

Fix

Incorrect Default Permissions

Weakness Enumeration

CWE-276

Related Identifiers

CVE-2020-24717

Affected Products

Openzfs

References · 8

• 🔥 https://jira.ixsystems.com/browse/NAS-107270 · Exploit
• https://github.com/openzfs/zfs/commit/716b53d0a14c72bda16c0872565dd1909757e73f · Patch
• https://github.com/openzfs/zfs/compare/zfs-0.8.4...zfs-2.0.0-rc1 · Patch
• https://reviews.freebsd.org/D26107 · Patch
• https://osv.dev/vulnerability/CVE-2020-24717 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-24717 · Security Note
• https://t.me/tmfeed/91954 · Telegram Post
• https://t.me/opennews/7335 · Telegram Post