Vulnerability CVE-2021-1772 - CERT Civis.Net

Vulnerability Name:

CVE-2021-1772 (CCN-195911)

Assigned:

2020-12-08

Published:

2021-02-01

Updated:

2022-06-03

Summary:

A stack overflow was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, watchOS 7.3, tvOS 14.4, iOS 14.4 and iPadOS 14.4. Processing a maliciously crafted text file may lead to arbitrary code execution.

CVSS v3 Severity:

7.8 High (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
6.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/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): High Integrity (I): High Availibility (A): High

7.8 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
6.8 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/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): High Integrity (I): High Availibility (A): High

CVSS v2 Severity:

6.8 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Medium Authentication (Au): None
Impact Metrics:	Confidentiality (C): Partial Integrity (I): Partial Availibility (A): Partial

6.8 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:C/I:C/A:C)

Exploitability Metrics:	Access Vector (AV): Local Access Complexity (AC): Low Athentication (Au): Single_Instance
Impact Metrics:	Confidentiality (C): Complete Integrity (I): Complete Availibility (A): Complete

Vulnerability Type:

Vulnerability Consequences:

Gain Access

References:

Source: MITRE
Type: CNA
CVE-2021-1772

Source: XF
Type: UNKNOWN
apple-macos-cve20211772-bo(195911)

Source: MISC
Type: Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212146

Source: CCN
Type: Apple security document HT212147
About the security content of macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave

Source: MISC
Type: Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212147

Source: MISC
Type: Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212148

Source: MISC
Type: Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212149

Source: CCN
Type: ZDI-21-140
Apple macOS CoreText ApplyContextPosFormat2 TTF Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability

Source: CCN
Type: ZDI-21-149
Apple macOS CoreText TTF Parsing Out-of-Bounds Write Remote Code Execution

Source: MISC
Type: Third Party Advisory, VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-758/

Vulnerable Configuration:

Configuration 1:

cpe:/o:apple:mac_os_x:*:*:*:*:*:*:*:* (Version >= 10.15 and < 10.15.7)

OR cpe:/o:apple:mac_os_x:*:*:*:*:*:*:*:* (Version >= 10.14 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:10.14.6:security_update_2019-004:*:*:*:*:*:*

OR cpe:/o:apple:ipados:*:*:*:*:*:*:*:* (Version < 14.4)

OR cpe:/o:apple:iphone_os:*:*:*:*:*:*:*:* (Version < 14.4)

OR cpe:/o:apple:mac_os_x:10.14.6:-:*:*:*:*:*:*

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:*:*:*:*:*:*

OR cpe:/o:apple:mac_os_x:10.14.6:security_update_2020-007:*:*:*:*:*:*

OR cpe:/o:apple:mac_os_x:10.14.6:supplemental_update:*:*:*:*:*:*

OR cpe:/o:apple:mac_os_x:10.14.6:supplemental_update_2:*:*:*:*:*:*

OR cpe:/o:apple:mac_os_x:10.15.7:-:*:*:*:*:*:*

OR cpe:/o:apple:mac_os_x:10.15.7:supplemental_update:*:*:*:*:*:*

OR cpe:/o:apple:macos:*:*:*:*:*:*:*:* (Version >= 11.0 and < 11.2)

OR cpe:/o:apple:tvos:*:*:*:*:*:*:*:* (Version < 14.4)

OR cpe:/o:apple:watchos:*:*:*:*:*:*:*:* (Version < 7.3)

Configuration CCN 1:

cpe:/o:apple:macos_catalina:10.15.6:*:*:*:*:*:*:*

OR cpe:/o:apple:macos_big_sur:11.0.0:*:*:*:*:*:*:*

Denotes that component is vulnerable