Multiple Vulnerabilities in Apple Products Could Allow for Arbitrary Code Execution

ITS Advisory Number: 
2018-045
Date(s) Issued: 
Thursday, April 26, 2018
Subject: 
Multiple Vulnerabilities in Apple Products Could Allow for Arbitrary Code Execution
Overview: 

Multiple vulnerabilities have been discovered in iOS, Safari, and High Sierra. The most severe of these vulnerabilities could allow for arbitrary code execution.      

  • iOS is a mobile operating system for mobile devices, including the iPhone, iPad, and iPod touch
  • Safari is a web browser available for OS X and Microsoft Windows.
  • High Sierra is a desktop and server operating system for Macintosh computers.   

Successful exploitation of the most severe of these vulnerabilities could result in arbitrary code execution within the context of the application, an attacker gaining the same privileges as the logged-on user, or the bypassing of security restrictions. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

Systems Affected: 
  • iOS Versions prior to 11.3.1
  • Security Update 2018-001 High Sierra
  • Safari Versions prior to 11.1
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 iOS, Safari, and High Sierra. The most severe of these vulnerabilities could allow for arbitrary code execution. Details of these vulnerabilities are as follows:

  • A spoofing issue existed in the handling of URLs. This issue was addressed with improved input validation. (CVE-2018-4187)
  • A memory corruption issue was addressed with improved state management. (CVE-2018-4200)
  • A memory corruption issue was addressed with improved memory handling. (CVE-2018-4204)
  • A memory corruption issue was addressed with improved error handling. (CVE-2018-4206)

Successful exploitation of the most severe of these vulnerabilities could result in arbitrary code execution within the context of the application, an attacker gaining the same privileges as the logged-on user, or the bypassing of security restrictions. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

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

Apple:

; text-decoration:underline">https://support.apple.com/en-us/HT208741

; text-decoration:underline">https://support.apple.com/en-us/HT208742

; text-decoration:underline">https://support.apple.com/en-us/HT208743

CVE: 

; text-decoration:underline">http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-4187

; text-decoration:underline">http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-4200

; text-decoration:underline">http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-4204

; text-decoration:underline">http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-4206