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tagline: Confidence in the Connected World

Multiple Vulnerabilities in Apple Products Could Allow for Arbitrary Code Execution

MS-ISAC ADVISORY NUMBER:

2019-074

DATE(S) ISSUED:

07/22/2019

OVERVIEW:

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

  • watchOS is the mobile operating system for the Apple Watch and is based on the iOS operating system.
  • Safari is a web browser available for OS X.
  • tvOS is an operating system for the fourth-generation Apple TV digital media player.
  • iOS is a mobile operating system for mobile devices, including the iPhone, iPad, and iPod touch.
  • macOS Mojave is a desktop and server operating system for Macintosh computers.
  • High Sierra is a desktop and server operating system for Macintosh computers.
  • 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.

THREAT INTELLIGENCE:

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

SYSTEMS AFFECTED:

  • watchOS versions prior to 5.3
  • Safari versions prior to 12.1.2
  • tvOS versions prior to 12.4
  • iOS versions prior to 12.4
  • macOS Mojave 10.14.6, Security Update 2019-004 High Sierra, Security Update 2019-004 Sierra

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 watchOS, Safari, tvOS, iOS, Mojave, High Sierra and Sierra. The most severe of these vulnerabilities could allow for arbitrary code execution. Details of these vulnerabilities are as follows:

  • A denial of service issue was addressed with improved validation. (CVE-2019-8665)
  • A logic issue existed in the answering of phone calls. The issue was addressed with improved state management. (CVE-2019-8699)
  • A logic issue existed in the handling of document loads. This issue was addressed with improved state management. (CVE-2019-8690)
  • A logic issue existed in the handling of synchronous page loads. This issue was addressed with improved state management. (CVE-2019-8649)
  • A logic issue was addressed with improved state management. (CVE-2019-8658)
  • A stack overflow was addressed with improved input validation. (CVE-2019-13118)
  • A validation issue existed in the entitlement verification. This issue was addressed with improved validation of the process entitlement. (CVE-2019-8698)
  • Multiple inconsistent user interface issues were addressed with improved state management. (CVE-2019-8667, CVE-2019-8670)
  • Multiple memory corruption issues were addressed with improved input validation. (CVE-2018-19860, CVE-2019-8648, CVE-2019-8660)
  • Multiple memory corruption issues were addressed with improved memory handling. (CVE-2019-8644, CVE-2019-8666, CVE-2019-8669, CVE-2019-8671, CVE-2019-8672, CVE-2019-8673, CVE-2019-8676, CVE-2019-8677, CVE-2019-8678, CVE-2019-8679, CVE-2019-8680, CVE-2019-8681, CVE-2019-8683, CVE-2019-8684, CVE-2019-8685, CVE-2019-8686, CVE-2019-8687, CVE-2019-8688, CVE-2019-8689, CVE-2019-8694, CVE-2019-8695, CVE-2019-8697)
  • Multiple out-of-bounds read was addressed with improved input validation. (CVE-2019-8624, CVE-2019-8641, CVE-2019-8646, CVE-2019-8657)
  • Multiple use after free issues were addressed with improved memory management. (CVE-2019-8647, CVE-2019-8661)
  • Multiple validation issues were addressed with improved input sanitization. (CVE-2019-8691, CVE-2019-8692, CVE-2019-8693)
  • Issue was addressed with improved checks. (CVE-2019-8659, CVE-2019-8662, CVE-2019-8663)
  • Issue was addressed with improved UI handling. (CVE-2019-8682)
  • Issue was addressed with improved checks to prevent unauthorized actions. (CVE-2018-16860)
  • This was addressed with additional checks by Gatekeeper on files mounted through a network share. (CVE-2019-8656)

RECOMMENDATIONS:

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-2018-16860 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-19860 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8624 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8641 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8644 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8646 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8647 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8648 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8649 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8656 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8657 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8658 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8659 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8660 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8661 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8662 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8663 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8665 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8666 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8667 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8669 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8670 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8671 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8672 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8673 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8676 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8677 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8678 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8679 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8680 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8681 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8682 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8683 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8684 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8685 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8686 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8687 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8688 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8689 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8690 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8691 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8692 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8693 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8694 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8695 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8697 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8698 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8699 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-13118

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