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A Vulnerability in macOS Big Sur, iOS and iPadOS Could Allow for Arbitrary Code Execution

MS-ISAC ADVISORY NUMBER:

2021-096

DATE(S) ISSUED:

07/27/2021

OVERVIEW:

A vulnerability has been discovered in macOS Big Sur, iOS and iPadOS, 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.
  • macOS Big Sur is the 17th and current major release of macOS.
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code with kernel privileges to take full control over a device.

THREAT INTELLIGENCE:

Apple is aware of a report that this issue may have been actively exploited to plant malware on vulnerable devices. (CVE-2021-30807)

SYSTEMS AFFECTED:

  • iOS prior to version 14.7.1
  • iPadOS prior to version 14.7.1
  • macOS Big Sur prior to version 11.5.1

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:

A vulnerability has been discovered in macOS Big Sur, iOS and iPadOS that could allow for arbitrary code execution. This vulnerability occurs due to a memory corruption issue in IOMobileFrameBuffer that was addressed with improved memory handling. Successful exploitation of this vulnerability could result in arbitrary code execution with kernel privileges to take full control over a device.

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 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:


Apple:
https://support.apple.com/en-us/HT212622
https://support.apple.com/en-us/HT212623

CVE:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30807


Security Affairs:
https://securityaffairs.co/wordpress/120576/security/apple-cve-2021-30807-zero-day.html

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