Vulnerabilities
Misconfiguration
Runtime Security
Compliance
CVE Vulnerabilities

CVE-2020-3838

Incorrect Default Permissions

Published: Feb 27, 2020 | Modified: Apr 30, 2021
CVSS 3.x
7.8
HIGH
Source:
NVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.x
9.3 HIGH
AV:N/AC:M/Au:N/C:C/I:C/A:C
RedHat/V2
RedHat/V3
Ubuntu
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2020-3838
CWEhttps://cwe.mitre.org/data/definitions/276.html

The issue was addressed with improved permissions logic. This issue is fixed in iOS 13.3.1 and iPadOS 13.3.1, macOS Catalina 10.15.3, tvOS 13.3.1, watchOS 6.1.2. An application may be able to execute arbitrary code with system privileges.

Weakness

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

Affected Software

Name Vendor Start Version End Version
Ipados Apple * 13.3.1 (excluding)
Iphone_os Apple * 13.3.1 (excluding)
Mac_os_x Apple * 10.14.6 (excluding)
Mac_os_x Apple 10.15 (including) 10.15.3 (excluding)
Mac_os_x Apple 10.14.6 (including) 10.14.6 (including)
Mac_os_x Apple 10.14.6-security_update_2019-001 (including) 10.14.6-security_update_2019-001 (including)
Mac_os_x Apple 10.14.6-security_update_2019-002 (including) 10.14.6-security_update_2019-002 (including)
Mac_os_x Apple 10.14.6-security_update_2020-001 (including) 10.14.6-security_update_2020-001 (including)
Mac_os_x Apple 10.14.6-security_update_2020-002 (including) 10.14.6-security_update_2020-002 (including)
Mac_os_x Apple 10.14.6-security_update_2020-003 (including) 10.14.6-security_update_2020-003 (including)
Mac_os_x Apple 10.14.6-security_update_2020-004 (including) 10.14.6-security_update_2020-004 (including)
Mac_os_x Apple 10.14.6-security_update_2020-005 (including) 10.14.6-security_update_2020-005 (including)
Mac_os_x Apple 10.14.6-security_update_2020-006 (including) 10.14.6-security_update_2020-006 (including)
Mac_os_x Apple 10.14.6-security_update_2020-007 (including) 10.14.6-security_update_2020-007 (including)
Mac_os_x Apple 10.14.6-security_update_2021-001 (including) 10.14.6-security_update_2021-001 (including)
Mac_os_x Apple 10.14.6-security_update_2021-002 (including) 10.14.6-security_update_2021-002 (including)
Mac_os_x Apple 10.14.6-supplemental_update (including) 10.14.6-supplemental_update (including)
Mac_os_x Apple 10.14.6-supplemental_update_2 (including) 10.14.6-supplemental_update_2 (including)
Tvos Apple * 13.3.1 (excluding)
Watchos Apple * 6.1.2 (excluding)

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

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