// For flags

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

0
*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
CVSS Scores
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
  • 2024-11-14 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-787: Out-of-bounds Write
CAPEC
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