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Multiple Vulnerabilities in Apple Products Could Allow for Arbitrary Code Execution

MS-ISAC ADVISORY NUMBER:

2020-098

DATE(S) ISSUED:

07/16/2020

OVERVIEW:

Multiple vulnerabilities have been discovered in iOS, iPadOS, macOS, tvOS, watchOS, and Safari. The most severe of these vulnerabilities could allow for arbitrary code execution.

  • iOS is a mobile operating system for Apple cellphones.
  • iPadOS is a mobile operating system for Apple tablets.
  • macOS is a desktop operating system for Macintosh computers
  • tvOS is an operating system for the Apple media streaming device Apple TV.
  • WatchOS is an operating system for Apple watches.
  • Safari is a web browser available for macOS.

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. Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights. Successful exploitation of these vulnerabilities could allow the attacker to execute remote code on the affected system.

THREAT INTELLIGENCE:

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

SYSTEMS AFFECTED:

  • iOS prior to 13.6
  • iPadOS prior to 13.6
  • macOS o Catalina prior to versions 10.15.6,
  • macOS o Mojave prior to Update 2020-004
  • macOS o High Sierra prior to Update 2020-004
  • tvOS prior to 13.4.8
  • watchOS prior to 6.2.8
  • Safari prior to 13.1.2

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:
HIGH

TECHNICAL SUMMARY:

Multiple vulnerabilities have been discovered in iOS, iPadOS, macOS, tvOS, watchOS, and Safari. The most severe of these vulnerabilities could allow for arbitrary code execution. Details of these vulnerabilities are as follows:

  • A buffer overflow issue was addressed with improved memory handling. (CVE-2020-9878)
  • A buffer overflow was addressed with improved bounds checking. (CVE-2020-9866)
  • A command injection issue existed in Web Inspector. This issue was addressed with improved escaping. (CVE-2020-9862)
  • A denial of service issue was addressed with improved input validation. (CVE-2020-9931)
  • A logic issues were addressed with improved restrictions. (CVE-2020-9864, CVE-2020-9903, CVE-2020-9911, CVE-2020-9912)
  • A logic issue was addressed with improved state management. (CVE-2020-9925)
  • A logic issue was addressed with improved validation. (CVE-2020-9870)
  • A memory corruption issues were addressed by removing the vulnerable code. (CVE-2020-9865, CVE-2020-9907)
  • A memory corruption issue was addressed with improved memory handling. (CVE-2020-9923)
  • An access issue existed in Content Security Policy. (CVE-2020-9915)
  • An authorization issue was addressed with improved state management. (CVE-2020-9933)
  • An input validation issue existed in Bluetooth. This issue was addressed with improved input validation. (CVE-2020-9914)
  • An input validation issue was addressed. (CVE-2019-19906)
  • An issue existed in the handling of environment variables. This issue was addressed with improved validation. (CVE-2020-9934)
  • An issue existed in the handling of iMessage tapbacks. The issue was resolved with additional verification. (CVE-2020-9885)
  • An out-of-bounds read was addressed with improved bounds checking. (CVE-2020-9799, CVE-2020-9888, CVE-2020-9890, CVE-2020-9891, CVE-2020-9909)
  • An out-of-bounds read was addressed with improved input validation. (CVE-2020-9894, CVE-2020-9918)
  • An out-of-bounds write issues were addressed with improved bounds checking. (CVE-2020-9884, CVE-2020-9889, CVE-2020-9936)
  • A routing issue was addressed with improved restrictions. (CVE-2019-14899)
  • A URL Unicode encoding issue was addressed with improved state management. (CVE-2020-9916)
  • A use after free issue was addressed with improved memory management. (CVE-2020-9893, CVE-2020-9895)
  • A remote attacker may be able to cause arbitrary code execution (CVE-2019-20807)
  • A remote attacker may be able to cause a denial of service (CVE-2020-9917)
  • A malicious attacker with arbitrary read and write capability may be able to bypass Pointer Authentication (CVE-2020-9910)
  • Vulnerability may allow a remote attacker to cause arbitrary code execution. (CVE-2019-20807)
  • Vulnerability may allow local user to leak sensitive user information (CVE-2020-9913)

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. Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights. Successful exploitation of these vulnerabilities could allow the attacker to execute remote code on the affected system.

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.

REFERENCES:

CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-14899 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-19906 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-20807 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9799 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9862 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9864 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9865 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9866 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9870 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9878 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9884 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9885 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9888 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9889 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9890 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9891 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9893 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9894 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9895 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9903 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9907 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9909 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9910 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9911 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9912 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9913 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9914 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9915 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9916 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9918 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9923 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9925 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9931 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9933 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9934 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9936

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