macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave

Analytics

Available for: macOS Big Sur 11.0.1, macOS Catalina 10.15.7, and macOS Mojave 10.14.6

Impact: A remote attacker may be able to cause a denial of service

Description: This issue was addressed with improved checks.

CVE-2021-1761: Cees Elzinga

APFS

Available for: macOS Big Sur 11.0.1

Impact: A local user may be able to read arbitrary files

Description: The issue was addressed with improved permissions logic.

CVE-2021-1797: Thomas Tempelmann

CFNetwork Cache

Available for: macOS Catalina 10.15.7 and macOS Mojave 10.14.6

Impact: Processing maliciously crafted web content may lead to arbitrary code execution

Description: An integer overflow was addressed with improved input validation.

CVE-2020-27945: Zhuo Liang of Qihoo 360 Vulcan Team

CoreAnimation

Available for: macOS Big Sur 11.0.1

Impact: A malicious application could execute arbitrary code leading to compromise of user information

Description: A memory corruption issue was addressed with improved state management.

CVE-2021-1760: @S0rryMybad of 360 Vulcan Team

CoreAudio

Available for: macOS Big Sur 11.0.1

Impact: Processing maliciously crafted web content may lead to code execution

Description: An out-of-bounds write was addressed with improved input validation.

CVE-2021-1747: JunDong Xie of Ant Security Light-Year Lab

CoreGraphics

Available for: macOS Big Sur 11.0.1, macOS Catalina 10.15.7, and macOS Mojave 10.14.6

Impact: Processing a maliciously crafted font file may lead to arbitrary code execution

Description: An out-of-bounds write issue was addressed with improved bounds checking.

CVE-2021-1776: Ivan Fratric of Google Project Zero

CoreMedia

Available for: macOS Big Sur 11.0.1

Impact: Processing a maliciously crafted image may lead to arbitrary code execution

Description: An out-of-bounds read was addressed with improved input validation.

CVE-2021-1759: Hou JingYi (@hjy79425575) of Qihoo 360 CERT

CoreText

Available for: macOS Big Sur 11.0.1, macOS Catalina 10.15.7, and macOS Mojave 10.14.6

Impact: Processing a maliciously crafted text file may lead to arbitrary code execution

Description: A stack overflow was addressed with improved input validation.

CVE-2021-1772: Mickey Jin of Trend Micro working with Trend Micro’s Zero Day Initiative

CoreText

Available for: macOS Big Sur 11.0.1, macOS Catalina 10.15.7, and macOS Mojave 10.14.6

Impact: A remote attacker may be able to cause arbitrary code execution

Description: An out-of-bounds read was addressed with improved bounds checking.

CVE-2021-1792: Mickey Jin & Junzhi Lu of Trend Micro working with Trend Micro’s Zero Day Initiative

Crash Reporter

Available for: macOS Catalina 10.15.7

Impact: A remote attacker may be able to cause a denial of service

Description: This issue was addressed with improved checks.

CVE-2021-1761: Cees Elzinga

Crash Reporter

Available for: macOS Big Sur 11.0.1, macOS Catalina 10.15.7, and macOS Mojave 10.14.6

Impact: A local attacker may be able to elevate their privileges

Description: Multiple issues were addressed with improved logic.

CVE-2021-1787: James Hutchins

Crash Reporter

Available for: macOS Big Sur 11.0.1, macOS Catalina 10.15.7, and macOS Mojave 10.14.6

Impact: A local user may be able to create or modify system files

Description: A logic issue was addressed with improved state management.

CVE-2021-1786: Csaba Fitzl (@theevilbit) of Offensive Security

Directory Utility

Available for: macOS Catalina 10.15.7

Impact: A malicious application may be able to access private information

Description: A logic issue was addressed with improved state management.

CVE-2020-27937: Wojciech Reguła (@_r3ggi) of SecuRing

Endpoint Security

Available for: macOS Catalina 10.15.7

Impact: A local attacker may be able to elevate their privileges

Description: A logic issue was addressed with improved state management.

CVE-2021-1802: Zhongcheng Li (@CK01) from WPS Security Response Center

FairPlay

Available for: macOS Big Sur 11.0.1

Impact: A malicious application may be able to disclose kernel memory

Description: An out-of-bounds read issue existed that led to the disclosure of kernel memory. This was addressed with improved input validation.

CVE-2021-1791: Junzhi Lu (@pwn0rz), Qi Sun & Mickey Jin of Trend Micro working with Trend Micro’s Zero Day Initiative

FontParser

Available for: macOS Catalina 10.15.7

Impact: Processing a maliciously crafted font may lead to arbitrary code execution

Description: An out-of-bounds read was addressed with improved input validation.

CVE-2021-1790: Peter Nguyen Vu Hoang of STAR Labs

FontParser

Available for: macOS Mojave 10.14.6

Impact: Processing a maliciously crafted font may lead to arbitrary code execution

Description: This issue was addressed by removing the vulnerable code.

CVE-2021-1775: Mickey Jin and Qi Sun of Trend Micro

FontParser

Available for: macOS Mojave 10.14.6

Impact: A remote attacker may be able to leak memory

Description: An out-of-bounds read was addressed with improved bounds checking.

CVE-2020-29608: Xingwei Lin of Ant Security Light-Year Lab

FontParser

Available for: macOS Big Sur 11.0.1 and macOS Catalina 10.15.7

Impact: A remote attacker may be able to cause arbitrary code execution

Description: An out-of-bounds read was addressed with improved bounds checking.

CVE-2021-1758: Peter Nguyen of STAR Labs

ImageIO

Available for: macOS Big Sur 11.0.1

Impact: Processing a maliciously crafted image may lead to arbitrary code execution

Description: An access issue was addressed with improved memory management.

CVE-2021-1783: Xingwei Lin of Ant Security Light-Year Lab

ImageIO

Available for: macOS Big Sur 11.0.1

Impact: Processing a maliciously crafted image may lead to arbitrary code execution

Description: An out-of-bounds read was addressed with improved bounds checking.

CVE-2021-1741: Xingwei Lin of Ant Security Light-Year Lab

CVE-2021-1743: Mickey Jin & Junzhi Lu of Trend Micro working with Trend Micro’s Zero Day Initiative, Xingwei Lin of Ant Security Light-Year Lab

ImageIO

Available for: macOS Big Sur 11.0.1

Impact: Processing a maliciously crafted image may lead to a denial of service

Description: A logic issue was addressed with improved state management.

CVE-2021-1773: Xingwei Lin of Ant Security Light-Year Lab

ImageIO

Available for: macOS Big Sur 11.0.1

Impact: Processing a maliciously crafted image may lead to a denial of service

Description: An out-of-bounds read issue existed in the curl. This issue was addressed with improved bounds checking.

CVE-2021-1778: Xingwei Lin of Ant Security Light-Year Lab

ImageIO

Available for: macOS Big Sur 11.0.1 and macOS Catalina 10.15.7

Impact: Processing a maliciously crafted image may lead to arbitrary code execution

Description: An out-of-bounds read was addressed with improved input validation.

CVE-2021-1736: Xingwei Lin of Ant Security Light-Year Lab

CVE-2021-1785: Xingwei Lin of Ant Security Light-Year Lab

ImageIO

Available for: macOS Big Sur 11.0.1, macOS Catalina 10.15.7, and macOS Mojave 10.14.6

Impact: Processing a maliciously crafted image may lead to a denial of service

Description: This issue was addressed with improved checks.

CVE-2021-1766: Danny Rosseau of Carve Systems

ImageIO

Available for: macOS Big Sur 11.0.1 and macOS Catalina 10.15.7

Impact: A remote attacker may be able to cause unexpected application termination or arbitrary code execution

Description: A logic issue was addressed with improved state management.

CVE-2021-1818: Xingwei Lin from Ant-Financial Light-Year Security Lab

ImageIO

Available for: macOS Big Sur 11.0.1 and macOS Catalina 10.15.7

Impact: Processing a maliciously crafted image may lead to arbitrary code execution

Description: This issue was addressed with improved checks.

CVE-2021-1742: Xingwei Lin of Ant Security Light-Year Lab

CVE-2021-1746: Mickey Jin & Qi Sun of Trend Micro, Xingwei Lin of Ant Security Light-Year Lab

CVE-2021-1754: Xingwei Lin of Ant Security Light-Year Lab

CVE-2021-1774: Xingwei Lin of Ant Security Light-Year Lab

CVE-2021-1777: Xingwei Lin of Ant Security Light-Year Lab

CVE-2021-1793: Xingwei Lin of Ant Security Light-Year Lab

ImageIO

Available for: macOS Big Sur 11.0.1 and macOS Catalina 10.15.7

Impact: Processing a maliciously crafted image may lead to arbitrary code execution

Description: An out-of-bounds write was addressed with improved input validation.

CVE-2021-1737: Xingwei Lin of Ant Security Light-Year Lab

CVE-2021-1738: Lei Sun

CVE-2021-1744: Xingwei Lin of Ant Security Light-Year Lab

IOKit

Available for: macOS Big Sur 11.0.1

Impact: An application may be able to execute arbitrary code with system privileges

Description: A logic error in kext loading was addressed with improved state handling.

CVE-2021-1779: Csaba Fitzl (@theevilbit) of Offensive Security

IOSkywalkFamily

Available for: macOS Big Sur 11.0.1

Impact: A local attacker may be able to elevate their privileges

Description: An out-of-bounds read was addressed with improved bounds checking.

CVE-2021-1757: Pan ZhenPeng (@Peterpan0927) of Alibaba Security, Proteas

Kernel

Available for: macOS Catalina 10.15.7 and macOS Mojave 10.14.6

Impact: An application may be able to execute arbitrary code with kernel privileges

Description: A logic issue existed resulting in memory corruption. This was addressed with improved state management.

CVE-2020-27904: Zuozhi Fan (@pattern_F_) of Ant Group Tianqiong Security Lab

Kernel

Available for: macOS Big Sur 11.0.1

Impact: A remote attacker may be able to cause a denial of service

Description: A use after free issue was addressed with improved memory management.

CVE-2021-1764: @m00nbsd

Kernel

Available for: macOS Big Sur 11.0.1, macOS Catalina 10.15.7, and macOS Mojave 10.14.6

Impact: A malicious application may be able to elevate privileges. Apple is aware of a report that this issue may have been actively exploited.

Description: A race condition was addressed with improved locking.

CVE-2021-1782: an anonymous researcher

Kernel

Available for: macOS Big Sur 11.0.1, macOS Catalina 10.15.7, and macOS Mojave 10.14.6

Impact: An application may be able to execute arbitrary code with kernel privileges

Description: Multiple issues were addressed with improved logic.

CVE-2021-1750: @0xalsr

Login Window

Available for: macOS Big Sur 11.0.1, macOS Catalina 10.15.7, and macOS Mojave 10.14.6

Impact: An attacker in a privileged network position may be able to bypass authentication policy

Description: An authentication issue was addressed with improved state management.

CVE-2020-29633: Jewel Lambert of Original Spin, LLC.

Messages

Available for: macOS Big Sur 11.0.1, macOS Catalina 10.15.7, and macOS Mojave 10.14.6

Impact: A user that is removed from an iMessage group could rejoin the group

Description: This issue was addressed with improved checks.

CVE-2021-1771: Shreyas Ranganatha (@strawsnoceans)

Model I/O

Available for: macOS Big Sur 11.0.1

Impact: Processing a maliciously crafted USD file may lead to unexpected application termination or arbitrary code execution

Description: An out-of-bounds write was addressed with improved input validation.

CVE-2021-1762: Mickey Jin of Trend Micro

Model I/O

Available for: macOS Catalina 10.15.7

Impact: Processing a maliciously crafted file may lead to heap corruption

Description: This issue was addressed with improved checks.

CVE-2020-29614: ZhiWei Sun (@5n1p3r0010) from Topsec Alpha Lab

Model I/O

Available for: macOS Big Sur 11.0.1, macOS Catalina 10.15.7, and macOS Mojave 10.14.6

Impact: Processing a maliciously crafted USD file may lead to unexpected application termination or arbitrary code execution

Description: A buffer overflow was addressed with improved bounds checking.

CVE-2021-1763: Mickey Jin of Trend Micro working with Trend Micro’s Zero Day Initiative

Model I/O

Available for: macOS Big Sur 11.0.1, macOS Catalina 10.15.7, and macOS Mojave 10.14.6

Impact: Processing a maliciously crafted image may lead to heap corruption

Description: This issue was addressed with improved checks.

CVE-2021-1767: Mickey Jin & Junzhi Lu of Trend Micro working with Trend Micro’s Zero Day Initiative

Model I/O

Available for: macOS Big Sur 11.0.1, macOS Catalina 10.15.7, and macOS Mojave 10.14.6

Impact: Processing a maliciously crafted USD file may lead to unexpected application termination or arbitrary code execution

Description: An out-of-bounds read was addressed with improved input validation.

CVE-2021-1745: Mickey Jin & Junzhi Lu of Trend Micro working with Trend Micro’s Zero Day Initiative

Model I/O

Available for: macOS Big Sur 11.0.1, macOS Catalina 10.15.7, and macOS Mojave 10.14.6

Impact: Processing a maliciously crafted image may lead to arbitrary code execution

Description: An out-of-bounds read was addressed with improved bounds checking.

CVE-2021-1753: Mickey Jin of Trend Micro working with Trend Micro’s Zero Day Initiative

Model I/O

Available for: macOS Big Sur 11.0.1, macOS Catalina 10.15.7, and macOS Mojave 10.14.6

Impact: Processing a maliciously crafted USD file may lead to unexpected application termination or arbitrary code execution

Description: An out-of-bounds read was addressed with improved bounds checking.

CVE-2021-1768: Mickey Jin & Junzhi Lu of Trend Micro working with Trend Micro’s Zero Day Initiative

NetFSFramework

Available for: macOS Big Sur 11.0.1, macOS Catalina 10.15.7, and macOS Mojave 10.14.6

Impact: Mounting a maliciously crafted Samba network share may lead to arbitrary code execution

Description: A logic issue was addressed with improved state management.

CVE-2021-1751: Mikko Kenttälä (@Turmio_) of SensorFu

OpenLDAP

Available for: macOS Big Sur 11.0.1, macOS Catalina 10.15.7, and macOS Mojave 10.14.6

Impact: A remote attacker may be able to cause a denial of service

Description: This issue was addressed with improved checks.

CVE-2020-25709

Power Management

Available for: macOS Mojave 10.14.6, macOS Catalina 10.15.7

Impact: A malicious application may be able to elevate privileges

Description: A logic issue was addressed with improved state management.

CVE-2020-27938: Tim Michaud (@TimGMichaud) of Leviathan

Screen Sharing

Available for: macOS Big Sur 11.0.1

Impact: Multiple issues in pcre

Description: Multiple issues were addressed by updating to version 8.44.

CVE-2019-20838

CVE-2020-14155

SQLite

Available for: macOS Catalina 10.15.7

Impact: Multiple issues in SQLite

Description: Multiple issues were addressed by updating SQLite to version 3.32.3.

CVE-2020-15358

Swift

Available for: macOS Big Sur 11.0.1

Impact: A malicious attacker with arbitrary read and write capability may be able to bypass Pointer Authentication

Description: A logic issue was addressed with improved validation.

CVE-2021-1769: CodeColorist of Ant-Financial Light-Year Labs

WebKit

Available for: macOS Big Sur 11.0.1

Impact: Processing maliciously crafted web content may lead to arbitrary code execution

Description: A use after free issue was addressed with improved memory management.

CVE-2021-1788: Francisco Alonso (@revskills)

WebKit

Available for: macOS Big Sur 11.0.1

Impact: Maliciously crafted web content may violate iframe sandboxing policy

Description: This issue was addressed with improved iframe sandbox enforcement.

CVE-2021-1765: Eliya Stein of Confiant

CVE-2021-1801: Eliya Stein of Confiant

WebKit

Available for: macOS Big Sur 11.0.1

Impact: Processing maliciously crafted web content may lead to arbitrary code execution

Description: A type confusion issue was addressed with improved state handling.

CVE-2021-1789: @S0rryMybad of 360 Vulcan Team

WebKit

Available for: macOS Big Sur 11.0.1

Impact: A remote attacker may be able to cause arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.

Description: A logic issue was addressed with improved restrictions.

CVE-2021-1871: an anonymous researcher

CVE-2021-1870: an anonymous researcher

WebRTC

Available for: macOS Big Sur 11.0.1

Impact: A malicious website may be able to access restricted ports on arbitrary servers

Description: A port redirection issue was addressed with additional port validation.

CVE-2021-1799: Gregory Vishnepolsky & Ben Seri of Armis Security, and Samy Kamkar

Additional recognition
Kernel

We would like to acknowledge Junzhi Lu (@pwn0rz), Mickey Jin & Jesse Change of Trend Micro for their assistance.

libpthread

We would like to acknowledge CodeColorist of Ant-Financial Light-Year Labs for their assistance.

Login Window

We would like to acknowledge Jose Moises Romero-Villanueva of CrySolve for their assistance.

Mail Drafts

We would like to acknowledge Jon Bottarini of HackerOne for their assistance.

Screen Sharing Server

We would like to acknowledge @gorelics for their assistance.

WebRTC

We would like to acknowledge Philipp Hancke for their assistance.

Duncan Newell

Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.

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