Vulnerability Name:

CVE-2020-27896 (CCN-191603)

Assigned:2020-11-12
Published:2020-11-12
Updated:2022-10-12
Summary:A path handling issue was addressed with improved validation. This issue is fixed in macOS Big Sur 11.0.1. A remote attacker may be able to modify the file system.
CVSS v3 Severity:5.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N)
4.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): High
Availibility (A): None
5.5 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N)
4.8 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): High
Availibility (A): None
CVSS v2 Severity:4.3 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
4.6 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:N/I:C/A:N)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): Complete
Availibility (A): None
Vulnerability Type:CWE-22
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2020-27896

Source: FULLDISC
Type: Mailing List, Third Party Advisory
20201215 APPLE-SA-2020-12-14-3 macOS Big Sur 11.1, Security Update 2020-001 Catalina, Security Update 2020-007 Mojave

Source: FULLDISC
Type: Mailing List, Third Party Advisory
20201215 APPLE-SA-2020-12-14-4 Additional information for APPLE-SA-2020-11-13-1 macOS Big Sur 11.0.1

Source: XF
Type: UNKNOWN
apple-macos-cve202027896-sec-bypass(191603)

Source: CCN
Type: Apple security document HT211931
About the security content of macOS Big Sur 11.0.1

Source: MISC
Type: Vendor Advisory
https://support.apple.com/en-us/HT211931

Source: CCN
Type: Apple security document HT212011
About the security content of macOS Big Sur 11.1, Security Update 2020-001 Catalina, Security Update 2020-007 Mojave

Source: CONFIRM
Type: Vendor Advisory
https://support.apple.com/kb/HT212011

Vulnerable Configuration:Configuration 1:
  • cpe:/o:apple:macos:*:*:*:*:*:*:*:* (Version >= 11.0 and < 11.0.1)
  • OR cpe:/o:apple:mac_os_x:*:*:*:*:*:*:*:* (Version >= 10.14.0 and < 10.14.6)
  • OR cpe:/o:apple:mac_os_x:10.14.6:security_update_2020-001:*:*:*:*:*:*
  • OR cpe:/o:apple:mac_os_x:10.14.6:security_update_2020-002:*:*:*:*:*:*
  • OR cpe:/o:apple:mac_os_x:10.14.6:security_update_2020-003:*:*:*:*:*:*
  • OR cpe:/o:apple:mac_os_x:10.14.6:security_update_2020-004:*:*:*:*:*:*
  • OR cpe:/o:apple:mac_os_x:10.14.6:security_update_2020-005:*:*:*:*:*:*
  • OR cpe:/o:apple:mac_os_x:10.14.6:security_update_2020-006:*:*:*:*:*:*
  • OR cpe:/o:apple:mac_os_x:10.14.6:security_update_2019-007:*:*:*:*:*:*
  • OR cpe:/o:apple:mac_os_x:*:*:*:*:*:*:*:* (Version >= 10.15.0 and < 10.15.7)
  • OR cpe:/o:apple:mac_os_x:10.15.7:-:*:*:*:*:*:*
  • OR cpe:/o:apple:mac_os_x:10.15.7:security_update_2020:*:*:*:*:*:*
  • OR cpe:/o:apple:mac_os_x:10.14.6:-:*:*:*:*:*:*
  • OR cpe:/o:apple:mac_os_x:10.14.6:security_update_2019-001:*:*:*:*:*:*
  • OR cpe:/o:apple:mac_os_x:10.14.6:security_update_2019-002:*:*:*:*:*:*
  • OR cpe:/o:apple:mac_os_x:10.14.6:security_update_2019-004:*:*:*:*:*:*
  • OR cpe:/o:apple:mac_os_x:10.14.6:security_update_2019-005:*:*:*:*:*:*
  • OR cpe:/o:apple:mac_os_x:10.14.6:security_update_2019-006:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/o:apple:macos_big_sur:11.0.0:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    apple macos *
    apple mac os x *
    apple mac os x 10.14.6 security_update_2020-001
    apple mac os x 10.14.6 security_update_2020-002
    apple mac os x 10.14.6 security_update_2020-003
    apple mac os x 10.14.6 security_update_2020-004
    apple mac os x 10.14.6 security_update_2020-005
    apple mac os x 10.14.6 security_update_2020-006
    apple mac os x 10.14.6 security_update_2019-007
    apple mac os x *
    apple mac os x 10.15.7 -
    apple mac os x 10.15.7 security_update_2020
    apple mac os x 10.14.6 -
    apple mac os x 10.14.6 security_update_2019-001
    apple mac os x 10.14.6 security_update_2019-002
    apple mac os x 10.14.6 security_update_2019-004
    apple mac os x 10.14.6 security_update_2019-005
    apple mac os x 10.14.6 security_update_2019-006
    apple macos big sur 11.0.0