CVE-2021-1877:Out-of-bounds read vulnerability in Apple iOS and iPadOS kernel that could allow local users to read kernel memory.

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Description Preview

CVE-2021-1877 is a vulnerability in Apple iOS and iPadOS where an out-of-bounds read issue exists in the kernel. This vulnerability could allow a local attacker to access and read sensitive kernel memory, potentially leading to information disclosure or privilege escalation. The vulnerability was addressed in iOS 14.5 and iPadOS 14.5 through improved input validation mechanisms.

Overview

This vulnerability (CWE-125: Out-of-bounds Read) affects the kernel component of Apple iOS and iPadOS versions prior to 14.5. The issue occurs when the application reads data past the end of the intended buffer, allowing attackers to potentially read sensitive information from kernel memory. Out-of-bounds read vulnerabilities can lead to information disclosure, which may aid attackers in developing further exploits. In this specific case, a local user with access to the device could potentially exploit this vulnerability to access protected kernel memory areas, which might contain sensitive system information or credentials.

Remediation

Users should update their devices to iOS 14.5 or iPadOS 14.5 or later versions, which contain the fix for this vulnerability. Apple has addressed the issue by implementing improved input validation mechanisms that prevent out-of-bounds memory access.

To update your device:

  1. Go to Settings > General > Software Update
  2. Download and install the available update
  3. Ensure your device is connected to power and Wi-Fi during the update process
  4. Verify the update was successful by checking that your iOS or iPadOS version is 14.5 or later

If automatic updates are not enabled, it is recommended to enable them to ensure timely security patches in the future.

References

  1. Apple Security Advisory: https://support.apple.com/en-us/HT212317
  2. Common Weakness Enumeration: CWE-125 (Out-of-bounds Read)
  3. MITRE CVE Entry: CVE-2021-1877

Industry ExposureMost to least
This section illustrates the prevalence of a specific Common Vulnerabilities and Exposures (CVE) across various industries based on customer reports. The ranking displays industries from the most to least affected by this particular vulnerability, offering valuable insight into where this CVE has been most frequently observed. This information can help organizations within these sectors prioritize their security efforts, understand their relative risk exposure compared to their peers, and focus remediation strategies where they are most needed. By understanding the industry-specific impact, organizations can make more informed decisions regarding patching, resource allocation, and overall risk management related to this CVE.

  1. Health Care & Social Assistance
    Health Care & Social Assistance
  2. Accommodation & Food Services
    Accommodation & Food Services
  3. Administrative, Support, Waste Management & Remediation Services
    Administrative, Support, Waste Management & Remediation Services
  4. Agriculture, Forestry Fishing & Hunting
    Agriculture, Forestry Fishing & Hunting
  5. Arts, Entertainment & Recreation
    Arts, Entertainment & Recreation
  6. Construction
    Construction
  7. Educational Services
    Educational Services
  8. Finance and Insurance
    Finance and Insurance
  9. Information
    Information
  10. Management of Companies & Enterprises
    Management of Companies & Enterprises
  11. Manufacturing
    Manufacturing
  12. Mining
    Mining
  13. Other Services (except Public Administration)
    Other Services (except Public Administration)
  14. Professional, Scientific, & Technical Services
    Professional, Scientific, & Technical Services
  15. Public Administration
    Public Administration
  16. Real Estate Rental & Leasing
    Real Estate Rental & Leasing
  17. Retail Trade
    Retail Trade
  18. Transportation & Warehousing
    Transportation & Warehousing
  19. Utilities
    Utilities
  20. Wholesale Trade
    Wholesale Trade

Focus on What Matters

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  3. Proactively Mitigate Threats.

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Armis Vulnerability Intelligence Database