CVE Vulnerabilities

CVE-2021-1832

Incorrect Default Permissions

Published: Sep 08, 2021 | Modified: Jan 09, 2023
CVSS 3.x
5.5
MEDIUM
Source:
NVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CVSS 2.x
4.3 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N
RedHat/V2
RedHat/V3
Ubuntu

Copied files may not have the expected file permissions. This issue is fixed in Security Update 2021-002 Catalina, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3. The issue was addressed with improved permissions logic.

Weakness

During installation, installed file permissions are set to allow anyone to modify those files.

Affected Software

Name Vendor Start Version End Version
Mac_os_x Apple 10.15 *
Mac_os_x Apple 10.15.7 10.15.7
Mac_os_x Apple 10.15.7 10.15.7
Mac_os_x Apple 10.15.7 10.15.7
Mac_os_x Apple 10.15.7 10.15.7
Mac_os_x Apple 10.15.7 10.15.7
Mac_os_x Apple 10.15.7 10.15.7
Macos Apple 11.0 *
Iphone_os Apple * *
Mac_os_x Apple 10.15.7 10.15.7
Tvos Apple * *
Watchos Apple * *
Ipados Apple * *

Potential Mitigations

  • Compartmentalize the system to have “safe” areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area.
  • Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.

References