CVE-2020-3862

What it actually does

A memory handling flaw in WebKit allows a malicious website to trigger a denial of service condition resulting in application crashes.

Why it matters to the business

Affected users experience sudden application or browser crashes when visiting malicious sites, causing lost productivity and interrupted access to web services across Apple platforms and related products.

How an attack unfolds

An attacker hosts a malicious website crafted to abuse the WebKit memory handling issue. When a victim visits the site with an unpatched browser or app, the flaw is triggered leading to a denial of service crash.

How to fix it

Upgrade to fixed releases: iOS 13.3.1, iPadOS 13.3.1, tvOS 13.3.1, Safari 13.0.5, iTunes for Windows 12.10.4, iCloud for Windows 11.0 or 7.17. Apply updates as soon as possible given the multi-year window since disclosure.

How to confirm the fix worked

Confirm that installed versions of Safari, iOS, iPadOS, tvOS, iTunes, and iCloud match or exceed the fixed releases listed in the advisory.

Typical attack path

1. Attacker prepares and hosts a malicious website exploiting the WebKit memory flaw
2. Victim is lured to visit the website using an affected Apple product or app
3. Website triggers improper memory handling during page rendering
4. Target application or browser crashes resulting in denial of service

How to detect it

Examine application crash logs and system event records for WebKit memory handling errors coinciding with visits to suspicious sites.

What your security team should do

• Immediately apply available patches to all affected Apple products and downstream dependents
• Monitor crash reports and WebKit logs for memory-related failures
• Block or warn users about untrusted websites until patching is complete