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Multiple Vulnerabilities in Apple Products Could Allow for Arbitrary Code Execution

MS-ISAC ADVISORY NUMBER:

2021-071

DATE(S) ISSUED:

05/25/2021

OVERVIEW:

Multiple vulnerabilities have been discovered in Apple Products, the most severe of which could allow for arbitrary code execution.

  • 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.
  • Safari is a graphical web browser developed by Apple, based on the WebKit engine.
  • watchOS is the mobile operating system for Apple Watch and is based on the iOS operating system.
  • macOS Big Sur is the 17th and current major release of macOS.
  • macOS Catalina is the 16th major release of macOS.
  • macOS Mojave is the 15th major release of macOS.
  • tvOS is an operating system for 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 permission associated with the application running the exploit, an attacker could then install programs; view, change, or delete data.

THREAT INTELLIGENCE:

There are reports that these vulnerabilities are being actively exploited in the wild.

SYSTEMS AFFECTED:

  • Safari prior to version 14.1.1
  • iOS prior to version 14.6
  • iPadOS prior to version 14.6
  • watchOS prior to version 7.5
  • tvOS prior to version 7.5
  • macOS Big Sur prior to version 11.4
  • macOS Catalina prior to security update 2021-003
  • macOS Mojave prior to security update 2021-004

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 Apple Products, the most severe of which could allow for arbitrary code execution. Details of these vulnerabilities are as follows:

iOS 14.6 and iPadOS 14.6

  • An arbitrary code execution was addresses with improved checks. (CVE-2021-30707)
  • A disclosure of user information was addressed with improved checks. (CVE-2021-30685)
  • An unexpected system termination or write kernel memory race condition was addresses with improved state handling. (CVE-2021-30714)
  • A logic issue was addressed with improved restrictions. (CVE-2021-30729)
  • A validation issue existed in the handling of symlinks. This issue was addressed with improved validation of symlinks. (CVE-2021-30681)
  • An out-of-bounds read was addresses with improved bounds checking. (CVE-2021-30686)
  • A logic issue was addresses with improved state management. (CVE-2021-30727)
  • An elevated privilege issue was addressed with improved checks. (CVE-2021-30724)
  • A logic issue was addressed with improved state management. (CVE-2021-30697)
  • A memory corruption issue was addressed with improved state management. (CVE-2021-30710)
  • An out-of-bounds read was addressed with improved bounds checking. (CVE-2021-30687)
  • A disclosure of user information was addresses with improved checks. (CVE-2021-30700)
  • An arbitrary code execution was addresses with improved checks. (CVE-2021-30701)
  • A disclose memory content issue was addressed with improved checks. (CVE-2021-30705)
  • A logic issues was addressed with improved validation. (CVE-2021-30740)
  • A disclose restricted memory issue was addresses with improved checks. (CVE-2021-30674)
  • A logic issue was addressed with improved state management. (CVE-2021-30704)
  • A denial of service issue was addresses with improved state management. (CVE-2021-30715)
  • A buffer overflow was addressed with improved size validation. (CVE-2021-30736)
  • A break out of the sandbox issue was addressed with improved environment sanitization. (CVE-2021-30677)
  • A use after free issue was addressed with improved memory management. (CVE-2021-30741)
  • A memory corruption issue was addressed with improved state management. (CVE-2021-30725)
  • An out-of-bounds read was addressed with improved input validation. (CVE-2021-30746)
  • A validation issue was addressed with improved logic. (CVE-2021-30693)
  • An out-of-bounds read was addressed with improved bounds checking. (CVE-2021-30695)
  • An out-of-bounds read was addressed with improved input validation. (CVE-2021-30708)
  • A disclose memory content issue was addresses with improved checks. (CVE-2021-30709)
  • A window management issue was addressed with improved state management. (CVE-2021-30699)
  • A memory corruption issue in the ASN.1 decoder was addressed by removing the vulnerable code. (CVE-2021-30737)
  • A less secure authentication mechanism logic issue was addressed with improved validation. (CVE-2021-30667)

Safari 14.1.1

  • Multiple memory corruption issues were addressed with improved memory handling. (CVE-2021-30749, 2021-30734)
  • A cross-origin issue with iframe elements was addressed with improved tracking of security origins. (CVE-2021-30744)
  • A logic issue was addressed with improved restrictions. (CVE-2021-30720)
  • A logic issue was addressed with improved restrictions. (CVE-2021-30682)
  • A use after free issue was addressed with improved memory management. (CVE-2021-21779)
  • A cross-site scripting issue was addressed with improved state management. (CVE-2021-30689)
  • An arbitrary code execution integer overflow was addressed with improved input validation. (CVE-2021-30663)
  • A null pointer dereference was addressed with improved input validation. (CVE-2021-23841, 2021-30698)

macOS Big Sur 11.4

  • An arbitrary code execution issue was addressed with improved state management. (CVE-2021-30678)
  • A logic issue was addressed with improved state management. (CVE-2021-30676)
  • A path handling issue was addressed with improved validation. (CVE-2021-30688)
  • A logic issue was addressed with improved state management. (CVE-2021-30669)
  • An arbitrary code execution issue was addressed with improved checks. (CVE-2021-30707)
  • A disclosure of user information issue was addressed with improved checks. (CVE-2021-30685)
  • A validation issue existed in the handling of symlinks. This issue was addressed with improved validation of symlinks. (CVE-2021-30681)
  • An out-of-bounds read was addressed with improved bounds checking. (CVE-2021-30686)
  • A logic issue was addressed with improved state management. (CVE-2021-30727)
  • An elevate privilege issue was addressed with improved checks. (CVE-2021-30724)
  • An access issue was addressed with improved access restrictions. (CVE-2021-30673)
  • A logic issue was addressed with improved state management. (CVE-2021-30684)
  • An out-of-bounds write issue was addressed with improved bounds checking. (CVE-2021-30735)
  • A logic issue was addressed with improved state management. (CVE-2021-30697)
  • A memory corruption issue was addressed with improved state management. (CVE-2021-30710)
  • A use after free issue was addressed with improved memory management. (CVE-2021-30683)
  • An out-of-bounds read was addressed with improved bounds checking. (CVE-2021-30687)
  • A disclosure of user information issue was addressed with improved checks. (CVE-2021-30700)
  • An arbitrary code execution issue was addressed with improved checks. (CVE-2021-30701)
  • A disclose memory contents issue was addressed with improved checks. (CVE-2021-30705)
  • An out-of-bounds read issue was addressed by removing the vulnerable code. (CVE-2021-30719)
  • An out-of-bounds write issue was addressed with improved bounds checking. (CVE-2021-30728, CVE-2021-30726)
  • An arbitrary code execution logic issue was addressed with improved validation. (CVE-2021-30740)
  • An arbitrary code execution logic issue was addressed with improved validation. (CVE-2021-30704)
  • A denial of service logic issue was addressed with improved state management. (CVE-2021-30715)
  • A buffer overflow was addressed with improved size validation. (CVE-2021-30736)
  • A memory corruption issue was addressed with improved validation. (CVE-2021-30739)
  • A logic issue was addressed with improved state management. (CVE-2021-30680)
  • A break out of the sandbox issue was addressed with improved environment sanitization. (CVE-2021-30677)
  • A bypass Login Window logic issue was addressed with improved state management. (CVE-2021-30702)
  • A misrepresent application state logic issue was addressed with improved state management. (CVE-2021-30696)
  • An information disclosure issue was addressed with improved state management. (CVE-2021- 30723, CVE-2021-30691, CVE-2021-30692, CVE-2021-30694)
  • A memory corruption issue was addressed with improved state management. (CVE-2021-30725)
  • An out-of-bounds read was addressed with improved input validation. (CVE-2021-30746)
  • An arbitrary code execution validation issue was addressed with improved logic. (CVE-2021-30693)
  • An out-of-bounds read was addressed with improved bounds checking. (CVE-2021-30695)
  • An out-of-bounds read was addressed with improved input validation. (CVE-2021-30708)
  • A disclose memory content issue was addressed with improved checks. (CVE-2021-30709)
  • An elevated privilege issue was addressed by removing the vulnerable code. (CVE-2021-30679)
  • A denial of service issue was addressed with improved checks. (CVE-2020-36226, CVE-2020-36227, CVE-2020-36223, CVE-2020-36224, CVE-2020-36225, CVE-2020-36221, CVE-2020-36228, CVE-2020-36222, CVE-2020-36230, CVE-2020-36229)
  • An issue with path validation logic for hardlinks was addressed with improved path sanitization. (CVE-2021-30738)
  • A memory corruption issue in the ASN.1 decoder was addressed by removing the vulnerable code. (CVE-2021-30737)
  • A denial of service logic issue was addressed with improved state management. (CVE-2021-30716)
  • A memory corruption issue was addressed with improved state management. (CVE-2021-30717)
  • A path handling issue was addressed with improved validation. (CVE-2021-30721)
  • An information disclosure issue was addressed with improved state management. (CVE-2021-30722)
  • A logic issue was addressed with improved state management. (CVE-2021-30712)
  • A bypass Login Window during a software update issue was addressed with improved checks. (CVE-2021-30668)
  • A modify restricted setting issue was addressed with improved checks. (CVE-2021-30718)
  • A validation issue was addressed with improved logic. (CVE-2021-30671)
  • A permissions issue was addressed with improved validation. (CVE-2021-30713)

macOS Catalina

  • A logic issue was addressed with improved state management. (CVE-2021-30676)
  • An arbitrary code execution issue was addressed with improved state management. (CVE-2021-30678)
  • A logic issue was addressed with improved state management. (CVE-2021-30669)
  • A disclosure of user information issue was addressed with improved checks. (CVE-2021-30685)
  • A validation issue existed in the handling of symlinks. This issue was addressed with improved validation of symlinks. (CVE-2021-30681)
  • An elevate privilege issue was addressed with improved checks. (CVE-2021-30724)
  • An access issue was addressed with improved access restrictions. (CVE-2021-30673)
  • A logic issue was addressed with improved state management. (CVE-2021-30684)
  • A memory corruption issue was addressed with improved state management. (CVE-2021-30710)
  • A denial of service race condition was addressed with improved locking. (CVE-2021-1884)
  • A logic issue was addressed with improved state management. (CVE-2021-30697)
  • A use after free issue was addressed with improved memory management. (CVE-2021-30683)
  • An out-of-bounds read was addressed with improved bounds checking. (CVE-2021-30687)
  • An arbitrary code execution issue was addressed with improved checks. (CVE-2021-30701)
  • An out-of-bounds write was addressed with improved input validation. (CVE-2021-30743)
  • A disclose memory contents issue was addressed with improved checks. (CVE-2021-30705)
  • An arbitrary code execution logic issue was addressed with improved validation. (CVE-2021-30704)
  • A denial of service logic issue was addressed with improved state management. (CVE-2021-30715)
  • A bypass Login Window logic issue was addressed with improved state management. (CVE-2021-30702)
  • An information disclosure issue was addressed with improved state management. (CVE-2021- 30723, CVE-2021-30691, CVE-2021-30692, CVE-2021-30694)
  • An out-of-bounds read was addressed with improved input validation. (CVE-2021-30746)
  • An arbitrary code execution validation issue was addressed with improved logic. (CVE-2021-30693)
  • An out-of-bounds read was addressed with improved bounds checking. (CVE-2021-30695)
  • An out-of-bounds read was addressed with improved input validation. (CVE-2021-30708)
  • A disclose memory content issue was addressed with improved checks. (CVE-2021-30709)
  • A memory corruption issue was addressed with improved state management. (CVE-2021-30725)
  • An elevated privilege issue was addressed by removing the vulnerable code. (CVE-2021-30679)
  • A denial of service issue was addressed with improved checks. (CVE-2020-36226, CVE-2020-36227, CVE-2020-36223, CVE-2020-36224, CVE-2020-36225, CVE-2020-36221, CVE-2020-36228, CVE-2020-36222, CVE-2020-36230, CVE-2020-36229)
  • A denial of service logic issue was addressed with improved state management. (CVE-2021-30716)
  • A memory corruption issue was addressed with improved state management. (CVE-2021-30717)
  • A logic issue was addressed with improved state management. (CVE-2021-30712)
  • A path handling issue was addressed with improved validation. (CVE-2021-30721)
  • An information disclosure issue was addressed with improved state management. (CVE-2021-30722)
  • A validation issue was addressed with improved logic. (CVE-2021-30671)

macOS Mojave

  • A logic issue was addressed with improved state management. (CVE-2021-30676)
  • An arbitrary code execution issue was addressed with improved state management. (CVE-2021-30678)
  • Multiple issues in apache were addressed by updating apache to version 2.4.46. (CVE-2021-30690)
  • A logic issue was addressed with improved state management. (CVE-2021-30669)
  • A validation issue existed in the handling of symlinks. This issue was addressed with improved validation of symlinks. (CVE-2021-30681)
  • An elevate privilege issue was addressed with improved checks. (CVE-2021-30724)
  • A memory corruption issue was addressed with improved state management. (CVE-2021-30710)
  • A denial of service race condition was addressed with improved locking. (CVE-2021-1884)
  • A logic issue was addressed with improved state management. (CVE-2021-30697)
  • A use after free issue was addressed with improved memory management. (CVE-2021-30683)
  • An out-of-bounds read was addressed with improved bounds checking. (CVE-2021-30687)
  • A disclose memory contents issue was addressed with improved checks. (CVE-2021-30705)
  • An arbitrary code execution logic issue was addressed with improved validation. (CVE-2021-30704)
  • A bypass Login Window logic issue was addressed with improved state management. (CVE-2021-30702)
  • An information disclosure issue was addressed with improved state management. (CVE-2021- 30723, CVE-2021-30691, CVE-2021-30692, CVE-2021-30694)
  • An out-of-bounds read was addressed with improved input validation. (CVE-2021-30746)
  • An arbitrary code execution validation issue was addressed with improved logic. (CVE-2021-30693)
  • An out-of-bounds read was addressed with improved bounds checking. (CVE-2021-30695)
  • An out-of-bounds read was addressed with improved input validation. (CVE-2021-30708)
  • A disclose memory content issue was addressed with improved checks. (CVE-2021-30709)
  • A memory corruption issue was addressed with improved state management. (CVE-2021-30725)
  • An elevated privilege issue was addressed by removing the vulnerable code. (CVE-2021-30679)
  • A denial of service issue was addressed with improved checks. (CVE-2020-36226, CVE-2020-36227, CVE-2020-36223, CVE-2020-36224, CVE-2020-36225, CVE-2020-36221, CVE-2020-36228, CVE-2020-36222, CVE-2020-36230, CVE-2020-36229)
  • A denial of service logic issue was addressed with improved state management. (CVE-2021-30716)
  • A memory corruption issue was addressed with improved state management. (CVE-2021-30717)
  • A logic issue was addressed with improved state management. (CVE-2021-30712)
  • A path handling issue was addressed with improved validation. (CVE-2021-30721)
  • An information disclosure issue was addressed with improved state management. (CVE-2021-30722)

watchOS 7.5

  • An arbitrary code execution was addresses with improved checks. (CVE-2021-30707)
  • A disclosure of user information was addressed with improved checks. (CVE-2021-30685)
  • A validation issue existed in the handling of symlinks. This issue was addressed with improved validation of symlinks. (CVE-2021-30681)
  • An out-of-bounds read was addresses with improved bounds checking. (CVE-2021-30686)
  • A logic issue was addresses with improved state management. (CVE-2021-30727)
  • An elevated privilege issue was addressed with improved checks. (CVE-2021-30724)
  • A logic issue was addressed with improved state management. (CVE-2021-30697)
  • A memory corruption issue was addressed with improved state management. (CVE-2021-30710)
  • An out-of-bounds read was addressed with improved bounds checking. (CVE-2021-30687)
  • A disclosure of user information was addresses with improved checks. (CVE-2021-30700)
  • An arbitrary code execution was addresses with improved checks. (CVE-2021-30701)
  • A disclose memory content issue was addressed with improved checks. (CVE-2021-30705)
  • A logic issues was addressed with improved validation. (CVE-2021-30740)
  • A logic issue was addressed with improved state management. (CVE-2021-30704)
  • A buffer overflow was addressed with improved size validation. (CVE-2021-30736)
  • A break out of its sandbox issue was addressed with improved environment sanitization. (CVE-2021-30677)
  • A memory corruption issue was addressed with improved state management. (CVE-2021-30725)

tvOS 14.5

  • An arbitrary code execution was addresses with improved checks. (CVE-2021-30707)
  • A disclosure of user information was addressed with improved checks. (CVE-2021-30685)
  • A validation issue existed in the handling of symlinks. This issue was addressed with improved validation of symlinks. (CVE-2021-30681)
  • An out-of-bounds read was addresses with improved bounds checking. (CVE-2021-30686)
  • A logic issue was addresses with improved state management. (CVE-2021-30727)
  • An elevated privilege issue was addressed with improved checks. (CVE-2021-30724)
  • A logic issue was addressed with improved state management. (CVE-2021-30697)
  • A memory corruption issue was addressed with improved state management. (CVE-2021-30710)
  • An out-of-bounds read was addressed with improved bounds checking. (CVE-2021-30687)
  • A disclosure of user information was addresses with improved checks. (CVE-2021-30700)
  • An arbitrary code execution was addresses with improved checks. (CVE-2021-30701)
  • A disclose memory content issue was addressed with improved checks. (CVE-2021-30705)
  • A logic issues was addressed with improved validation. (CVE-2021-30740)
  • A logic issue was addressed with improved state management. (CVE-2021-30704)
  • A buffer overflow was addressed with improved size validation. (CVE-2021-30736)
  • A break out of its sandbox issue was addressed with improved environment sanitization. (CVE-2021-30677)
  • A memory corruption issue was addressed with improved state management. (CVE-2021-30725)

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 permission associated with the application running the exploit, an attacker could then install programs; view, change, or delete data.

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 nonprivileged user (one without administrative privileges) to diminish the effects of a successful attack.
  • Remind users not to download, accept or execute files from untrusted and unknown sources.
  • Remind users not to visit untrusted websites or follow links provided by untrusted or unknown sources.
  • Evaluate read, write, and execute permissions on all newly installed software.
  • Apply the Principle of Least Privilege to all systems and services.

REFERENCES:

CVE:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-36221 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-36222 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-36223 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-36224 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-36225 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-36227 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-36228 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-36229 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-36230 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1884 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21779 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23841 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30667 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30674 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30674 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30677 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30681 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30682 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30685 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30686 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30687 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30689 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30693 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30695 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30697 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30698 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30699 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30700 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30701 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30704 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30705 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30708 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30709 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30710 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30714 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30715 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30720 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30724 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30725 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30727 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30729 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30734 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30736 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30737 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30740 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30741 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30746 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30749

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