CVE-2020-3864 Security feature bypass in Safari

High 7.8 Published 27 Oct 2020 Updated 4 Aug 2024

Attackers can bypass same-origin policy restrictions in Safari and related Apple services due to a DOM object context validation flaw.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2020-3864?

CVE-2020-3864 is a high-severity vulnerability in Apple Icloud, published on 27 Oct 2020. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A logic issue was addressed with improved validation. This issue is fixed in iCloud for Windows 7.17, iTunes 12.10.4 for Windows, iCloud for Windows 10.9.2, tvOS 13.3.1, Safari 13.0.5, iOS 13.3.1 and iPadOS 13.3.1. A DOM object context may not have had a unique security origin.

Weakness: CWE-346

Which versions are affected by CVE-2020-3864?

It affects 9 products.

Products include Apple Icloud, Apple Ipados, Apple Iphone Os, Apple Itunes, Apple Safari, Apple Tvos and 3 more.

How do I fix CVE-2020-3864?

Upgrade to a fixed version.

Is CVE-2020-3864 being exploited?

There is no known exploitation of CVE-2020-3864 in the wild and no public exploit code.

All Apple Icloud vulnerabilities

Sources

Also known as DEBIAN-CVE-2020-3864, GHSA-wwr3-9qhx-q62f, UBUNTU-CVE-2020-3864.