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Multiple Vulnerabilities in Apple Products Could Allow for Arbitrary Code Execution

MS-ISAC ADVISORY NUMBER:

2019-099

DATE(S) ISSUED:

09/26/2019

OVERVIEW:

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

  • Xcode is an integrated development environment for MacOS
  • tvOS is an operating system for the fourth-generation Apple TV digital media player.
  • Safari is a web browser available for OS X.
  • iOS is a mobile operating system for mobile devices, including the iPhone, iPad, and iPod touch.
  • iPadOS is the successor to iOS 12 and is a mobile operating system for iPads
  • watchOS is the mobile operating system for the Apple Watch and is based on the iOS operating system.
  • 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:

  • Xcode versions prior to 11.0
  • tvOS versions prior to 13
  • Safari versions prior to 13.0.1
  • Apple TV Software 7.4
  • iOS versions prior to 13.1
  • iPadOS versions prior to 13.1
  • watchOS versions prior to 5.3.2
  • macOS Mojave 10.14.6, Security Update 2019-005 High Sierra, Security Update 2019-005 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 Xcode, tvOS, Safari, iOS, iPadOS, watchOS, 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 integer overflow issue in libssh2 was addressed by updating to version ld64-507.4. (CVE-2019-3855)
  • Multiple arbitrary code execution vulnerabilities with code compilation in Xcode were addressed by updating to version ld64-507.4. (CVE-2019-8721, CVE-2019-8722, CVE-2019-8723, CVE-2019-8724)
  • A memory corruption issue was addressed with improved state management. (CVE-2019-8738, CVE-2019-8739)
  • An authentication issue was addressed with improved state management. (CVE-2019-8704)
  • An inconsistent user interface issue was addressed with improved state management. (CVE-2019-8654)
  • An information leakage issue was addressed with improved handling of service worker lifetime. (CVE-2019-8725)
  • An information leakage issue was addressed by restricting options offered on a locked device. (CVE-2019-8775)
  • An out-of-bounds read was addressed with improved input validation. (CVE-2019-8641)

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:

Information Hub : Advisories


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Pencil Blog post 05 Dec 2019
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Pencil Blog post 03 Dec 2019
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