Multiple Vulnerabilities in Apple Products Could Allow for Arbitrary Code Execution

ITS Advisory Number: 
2021-120
Date(s) Issued: 
Friday, September 24, 2021
Subject: 
Multiple Vulnerabilities in Apple Products Could Allow for Arbitrary Code Execution
Overview: 

Multiple vulnerabilities have been discovered in Apple Products, the most severe of which could allow for arbitrary code execution.

  • iOS is a mobile operating system for mobile devices, including the iPhone, iPad, and iPod touch.
  • macOS Catalina is the 16th major release of macOS.

Successful exploitation of the most severe of these vulnerabilities could result in arbitrary code execution with kernel privileges.

 

THREAT INTELLIGENCE:

Apple has reported that all three vulnerabilities below have been seen in the wild. (CVE-2021-30860, CVE-2021-30869, CVE-2021-30858)

Systems Affected: 
  • iOS prior to 12.5.5
  • macOS Catalina prior to Security Update 2021-006
RISK
GOVERNMENT
Large and medium government entities: 
High
Small government entities: 
Medium
BUSINESS
Large and medium business entities: 
High
Small business entities: 
Medium
Home Users: 
Low
Description: 

Multiple vulnerabilities have been discovered in Apple Products, the most severe of which could allow for arbitrary code execution with kernel privileges. Details of these vulnerabilities are as follows:

 

iOS:

  • An integer overflow was addressed with improved input validation, which could lead to arbitrary code execution. (CVE-2021-30860)
  • A use after free issue was addressed with improved memory management, which could lead to arbitrary code execution. (CVE-2021-30858)
  • A type confusion issue was addressed with improved state handling, which could lead to arbitrary code execution. (CVE-2021-30869)

 

macOS Catalina:

  • A type confusion issue was addressed with improved state handling, which could allow for arbitrary code execution with kernel privileges. (CVE-2021-30869)

 

Successful exploitation of the most severe of these vulnerabilities could result in arbitrary code execution with kernel privileges. Depending on the permission associated with the application running the exploit, an attacker could then install programs; view, change, or delete data.

Actions: 
  • After appropriate testing, immediately apply patches provided by Apple to vulnerable systems.
  • Run all software as a nonprivileged user (one without administrative privileges) to diminish the effects of a successful attack.
  • Remind users not to download, accept or execute files from untrusted and unknown sources.
  • Remind users not to visit untrusted websites or follow links provided by untrusted or unknown sources.
  • Evaluate read, write, and execute permissions on all newly installed software.
  • Apply the Principle of Least Privilege to all systems and services.