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Multiple Vulnerabilities in Apple Products Could Allow for Arbitrary Code Execution

MS-ISAC ADVISORY NUMBER:

2018-006

DATE(S) ISSUED:

01/23/2018

OVERVIEW:

Multiple vulnerabilities have been discovered in Safari, watchOS, iOS, High Sierra, Sierra, El Capitan, and tvOS, the most severe of which could allow for arbitrary code execution.

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

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:

These updates also include patches to Apple systems for the Spectre and Meltdown vulnerabilities. There are currently no reports of these vulnerabilities being exploited in the wild.

SYSTEMS AFFECTED:

  • Safari Versions prior to 11.0.3
  • watchOS Versions prior to 4.2.2
  • iOS Versions prior to 11.2.5
  • macOS High Sierra versions prior to 10.13.3
  • macOS Sierra 10.12.6
  • OS X El Capitan 10.11.6
  • tvOS Versions prior to 11.2.5

RISK:

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

TECHNICAL SUMMARY:

Multiple vulnerabilities have been discovered in Safari, watchOS, iOS, High Sierra, Sierra, El Capitan, and tvOS, the most severe of which could allow for arbitrary code execution. Details of these vulnerabilities are as follows:

  • A certificate evaluation issue existed in the handling of name constraints. This issue was addressed through improved trust evaluation of certificates. (CVE-2018-4086)
  • An application may be able to execute arbitrary code with kernel privileges. This issue was addressed with improved validation. (CVE-2018-4097)
  • A memory corruption issue existed in the processing of web content. This issue was addressed through improved input validation. (CVE-2018-4085)
  • A memory initialization issue was addressed through improved memory handling. (CVE-2018-4090)
  • An access issue was addressed through additional sandbox restrictions. (CVE-2018-4091)
  • An out-of-bounds read issue existed in the curl. This issue was addressed through improved bounds checking. (CVE-2017-8817)
  • A race condition was addressed through improved locking. (CVE-2018-4092)
  • A resource exhaustion issue was addressed through improved input validation. (CVE-2018-4100)
  • Multiple memory corruption issues were addressed through improved input validation. (CVE-2018-4082, CVE-2018-4094)
  • Multiple memory corruption issues were addressed with improved memory handling. (CVE-2018-4087, CVE-2018-4095, CVE-2018-4098)
  • Multiple memory corruption issues were addressed with improved memory handling. (CVE-2018-4088, CVE-2018-4089, CVE-2018-4096)
  • Multiple validation issues were addressed with improved input sanitization. (CVE-2018-4084, CVE-2018-4093)
  • Systems with microprocessors utilizing speculative execution and indirect branch prediction may allow unauthorized disclosure of information to an attacker with local user access via a side-channel analysis of the data cache. (CVE-2017-5754)

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.

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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