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Multiple Vulnerabilities in Apple Products Could Allow for Arbitrary Code Execution

MS-ISAC ADVISORY NUMBER:

2019-130

DATE(S) ISSUED:

12/10/2019

OVERVIEW:

Multiple vulnerabilities have been discovered in Xcode, watchOS, Safari, iOS, iPadOS, macOS, and tvOS. 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.
  • iTunes is a media player, media library, online radio broadcaster, and mobile device management application developed by Apple.
  • 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.
  • iPadOS is the successor to iOS 12 and is a mobile operating system for iPads.
  • iOS is a mobile operating system for mobile devices, including the iPhone, iPad, and iPod touch.

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 prior to 11.3
  • iOS prior to 12.4.4, 13.3
  • iPadOS prior to 13.3
  • Safari prior to 13.0.4
  • watchOS prior to 6.1.1, 5.3.4
  • macOS Catalina prior to 10.15.2, Security Update 2019-002 Mojave, and Security Update 2019-007 High Sierra
  • tvOS prior to 13.3

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, watchOS, Safari, iOS, iPadOS, macOS, and tvOS. 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-2019-8839, CVE-2019-8842)
  • Memory corruption issues were addressed with improved memory handling. (CVE-2019-8828, CVE-2019-8832, CVE-2019-8835, CVE-2019-8836, CVE-2019-8837, CVE-2019-8838, CVE-2019-8844, CVE-2019-8847, CVE-2019-8852)
  • A memory corruption issue was addressed by removing the vulnerable code. (CVE-2019-8833)
  • An API issue existed in the handling of outgoing phone calls initiated with Siri. This issue was addressed with improved state handling. (CVE-2019-8856)
  • An information disclosure issue was addressed by removing the vulnerable code. (CVE-2019-8841)
  • An out-of-bounds read was addressed with improved bounds checking. (CVE-2019-8840)
  • An out-of-bounds read was addressed with improved input validation. (CVE-2019-8830)
  • A use after free issue was addressed with improved memory management. (CVE-2019-8846)
  • A validation issue was addressed with improved input sanitization. (CVE-2019-8853)
  • Multiple issues were addressed by updating to OpenLDAP version 2.4.28. (CVE-2012-1164, CVE-2012-2668, CVE-2013-4449, CVE-2015-1545, CVE-2019-13057, CVE-2019-13565)
  • Multiple issues were addressed by updating to tcpdump version 4.9.3 and libpcap version 1.9.1. (CVE-2017-16808, CVE-2018-10103, CVE-2018-10105, CVE-2018-14461, CVE-2018-14462, CVE-2018-14463, CVE-2018-14464, CVE-2018-14465, CVE-2018-14466, CVE-2018-14467, CVE-2018-14468, CVE-2018-14469, CVE-2018-14470, CVE-2018-14879, CVE-2018-14880, CVE-2018-14881, CVE-2018-14882, CVE-2018-16227, CVE-2018-16228, CVE-2018-16229, CVE-2018-16230, CVE-2018-16300, CVE-2018-16301, CVE-2018-16451, CVE-2018-16452, CVE-2019-15161, CVE-2019-15162, CVE-2019-15163, CVE-2019-15164, CVE-2019-15165, CVE-2019-15166, CVE-2019-15167)
  • Improved validation when an iCloud Link is created. (CVE-2019-8857)
  • An information disclosure issue was addressed by updating to expat version 2.2.8. (CVE-2019-15903)
  • A privilege elevation issue was addressed with improved checks. (CVE-2019-8848)

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-2012-1164 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2668 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-4449 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1545 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-16808 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-10103 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-10105 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14461 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14462 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14463 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14464 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14465 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14466 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14467 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14468 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14469 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14470 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14879 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14880 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14881 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14882 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-16227 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-16228 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-16229 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-16230 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-16300 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-16301 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-16451 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-16452 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8828 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8830 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8832 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8833 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8835 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8836 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8837 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8838 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8839 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8840 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8841 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8842 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8844 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8846 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8847 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8848 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8852 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8853 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8856 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8857 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-13057 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-13565 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15161 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15162 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15163 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15164 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15165 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15166 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15167 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15903

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