CVE-2020-9999

Apple macOS CoreText MorxLigatureSubtableBuilder TTF Parsing Out-of-Bounds Write Remote Code Execution Vulnerability

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A memory corruption issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.0.1, iTunes for Windows 12.10.9. Processing a maliciously crafted text file may lead to arbitrary code execution.

Se abordó un problema de corrupción de la memoria con una administración de estado mejorada. Este problema se corrigió en MacOS Big Sur versión 11.0.1, iTunes para Windows versión 12.10.9. Un procesamiento de un archivo de texto malicioso puede conllevar a una ejecución de código arbitraria

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Apple macOS. Interaction with the CoreText library is required to exploit this vulnerability but attack vectors may vary depending on the implementation.
The specific flaw exists within the parsing of TTF fonts. Crafted data in a TTF file can trigger a write past the end of an allocated data structure. An attacker can leverage this vulnerability to execute code in the context of the current process.

*Credits: Mickey Jin & Junzhi Lu of Trend Micro Mobile Security Research Team

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-03-02 CVE Reserved
2020-12-08 CVE Published
2024-08-04 CVE Updated
2024-10-12 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-787: Out-of-bounds Write

CAPEC

References (7)

URL	Tag	Source
http://seclists.org/fulldisclosure/2020/Dec/32	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://support.apple.com/en-us/HT211931	2021-07-21
https://support.apple.com/en-us/HT211952	2021-07-21
https://support.apple.com/kb/HT211843	2021-07-21
https://support.apple.com/kb/HT211844	2021-07-21
https://support.apple.com/kb/HT211850	2021-07-21
https://support.apple.com/kb/HT211935	2021-07-21

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Apple Search vendor "Apple"		Icloud Search vendor "Apple" for product "Icloud"				< 11.5.0 Search vendor "Apple" for product "Icloud" and version " < 11.5.0"		windows		Affected
Apple Search vendor "Apple"		Itunes Search vendor "Apple" for product "Itunes"				< 12.10.9 Search vendor "Apple" for product "Itunes" and version " < 12.10.9"		windows		Affected
Apple Search vendor "Apple"		Ipados Search vendor "Apple" for product "Ipados"				< 14.0 Search vendor "Apple" for product "Ipados" and version " < 14.0"		-		Affected
Apple Search vendor "Apple"		Iphone Os Search vendor "Apple" for product "Iphone Os"				< 14.0 Search vendor "Apple" for product "Iphone Os" and version " < 14.0"		-		Affected
Apple Search vendor "Apple"		Mac Os X Search vendor "Apple" for product "Mac Os X"				< 11.0.1 Search vendor "Apple" for product "Mac Os X" and version " < 11.0.1"		-		Affected
Apple Search vendor "Apple"		Tvos Search vendor "Apple" for product "Tvos"				< 14.0 Search vendor "Apple" for product "Tvos" and version " < 14.0"		-		Affected
Apple Search vendor "Apple"		Watchos Search vendor "Apple" for product "Watchos"				< 7.0 Search vendor "Apple" for product "Watchos" and version " < 7.0"		-		Affected