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Multiple Vulnerabilities in Apple Products Could Allow for Arbitrary Code Execution

MS-ISAC ADVISORY NUMBER:

2019-105

DATE(S) ISSUED:

10/09/2019

OVERVIEW:

Multiple vulnerabilities have been discovered in iCloud, iTunes, and macOS Catalina. The most severe of these vulnerabilities could allow for arbitrary code execution.

  • iCloud is a cloud storage service.
  • iTunes is a media player, media library, online radio broadcaster, and mobile device management application developed by Apple.
  • macOS Catalina is a desktop 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.

THREAT INTELLIGENCE:

There are currently no reports of these vulnerabilities being exploited in the wild.

SYSTEMS AFFECTED:

  • iCloud for Windows 7 prior to 7.14
  • iCloud for Windows 10 prior to 10.7
  • iTunes for Windows prior to 12.10.1
  • macOS Catalina 10.15

RISK:

Government:
  • Large and medium government entities: HIGH
  • Small government entities: HIGH
Businesses:
  • Large and medium business entities: HIGH
  • Small business entities: HIGH
Home Users:
LOW

TECHNICAL SUMMARY:

Multiple vulnerabilities have been discovered in iCloud, iTunes, and macOS Catalina. The most severe of these vulnerabilities could allow for arbitrary code execution. Details of these vulnerabilities are as follows:

  • A buffer overflow was addressed with improved bounds checking. (CVE-2019-8745)
  • A logic issue was addressed with improved restrictions. (CVE-2019-8755)
  • A logic issue was addressed with improved state management. (CVE-2019-8625, CVE-2019-8719)
  • A memory corruption issues were addressed with improved memory handling. (CVE-2019-8701, CVE-2019-8717, CVE-2019-8748, CVE-2019-8758)
  • A memory corruption issues were addressed with improved memory handling. (CVE-2019-8707, CVE-2019-8720, CVE-2019-8726, CVE-2019-8733, CVE-2019-8735, CVE-2019-8763)
  • A memory corruption issue was addressed with improved state management. (CVE-2019-8781)
  • A memory corruption issue was addressed with improved validation. (CVE-2019-8705)
  • An issue existed in the drawing of web page elements. The issue was addressed with improved logic. (CVE-2019-8769)
  • An issue existed in the handling of links in encrypted PDFs. This issue was addressed by adding a confirmation prompt. (CVE-2019-8772)
  • A race condition existed when reading and writing user preferences. This was addressed with improved state handling. (CVE-2019-8757)
  • Multiple issues were addressed by updating to PHP version 7.3.8. (CVE-2019-11041, CVE-2019-11042)
  • “Clear History and Website Data” did not clear the history. The issue was addressed with improved data deletion. (CVE-2019-8768)
  • The contents of locked notes sometimes appeared in search results. This issue was addressed with improved data cleanup. (CVE-2019-8730)
  • The issue was addressed with improved permissions logic. (CVE-2019-8770)

RECOMMENDATIONS:

We recommend the following actions be taken:

  • Apply appropriate patches provided by Apple to vulnerable systems immediately after appropriate testing.
  • 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.

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