CVE-2020-3867 Cross-site scripting in Safari

What is CVE-2020-3867?

CVE-2020-3867 is a medium-severity cross-site scripting vulnerability in Apple Icloud, published on 27 Feb 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

A logic issue was addressed with improved state management. This issue is fixed in iOS 13.3.1 and iPadOS 13.3.1, tvOS 13.3.1, Safari 13.0.5, iTunes for Windows 12.10.4, iCloud for Windows 11.0, iCloud for Windows 7.17. Processing maliciously crafted web content may lead to universal cross site scripting.

Weakness: CWE-79

Which versions are affected by CVE-2020-3867?

It affects 8 products.

Products include Apple Icloud, Apple Ipados, Apple Iphone Os, Apple Itunes, Apple Safari, Apple Tvos and 2 more.

How do I fix CVE-2020-3867?

Apply the vendor's patch.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2020-3867 being exploited?

There is no known exploitation of CVE-2020-3867 in the wild and no public exploit code.

Other vulnerabilities in Apple Icloud

• CVE-2019-8506 Apple Multiple Products Type Confusion Exploited High 8.8
• CVE-2020-27932 Apple Multiple Products Type Confusion Exploited High 7.8
• CVE-2019-8746 Memory corruption in iOS Critical 9.8
• CVE-2019-8749 Memory corruption in iOS Critical 9.8
• CVE-2019-8756 Memory corruption in iOS Critical 9.8

All Apple Icloud vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2020-3867, GHSA-9r2g-r54v-5426, UBUNTU-CVE-2020-3867.