Eliya Stein

Name of the Vulnerable Software and Affected Versions: macOS versions prior to Big Sur 11.2 Security Update versions prior to 2021-001 Catalina Security Update versions prior to 2021-001 Mojave Description: The issue allows maliciously crafted web content to violate iframe sandboxing policy. This is addressed with improved iframe sandbox enforcement. Recommendations: For macOS versions prior to Big Sur 11.2, update to macOS Big Sur 11.2 or later. For Security Update versions prior to 2021-001 Catalina, apply Security Update 2021-001 Catalina or later. For Security Update versions prior to 2021-001 Mojave, apply Security Update 2021-001 Mojave or later.

Name of the Vulnerable Software and Affected Versions: macOS Big Sur versions prior to 11.2 Security Update versions prior to 2021-001 Catalina Security Update versions prior to 2021-001 Mojave watchOS versions prior to 7.3 tvOS versions prior to 14.4 iOS versions prior to 14.4 iPadOS versions prior to 14.4 Description: This issue was addressed with improved iframe sandbox enforcement. Maliciously crafted web content may violate iframe sandboxing policy. The issue was exploited by the "ScamClub" malvertiser to bypass iframe sandboxing using postMessage() function. Over 50 million malicious ad displays were made in the last 90 days, with peaks of up to 16 million in one day. Recommendations: For macOS Big Sur versions prior to 11.2, update to macOS Big Sur 11.2. For Security Update versions prior to 2021-001 Catalina, apply Security Update 2021-001 Catalina. For Security Update versions prior to 2021-001 Mojave, apply Security Update 2021-001 Mojave. For watchOS versions prior to 7.3, update to watchOS 7.3. For tvOS versions prior to 14.4, update to tvOS 14.4. For iOS versions prior to 14.4, update to iOS 14.4. For iPadOS versions prior to 14.4, update to iPadOS 14.4. As a temporary workaround, consider restricting the use of the `postMessage()` function until a patch is available.

The issue is related to errors in privilege management within the isolated environment of the Firefox for Android browser's iframe. It could allow a remote attacker to impact data integrity. The vulnerability can be exploited through navigations using the Android-specific `intent` URL scheme, potentially allowing an attacker to escape the iframe sandbox.

The issue is related to insufficient policy enforcement in the PopupBlocker component of Google Chrome, allowing a remote attacker to bypass navigation restrictions. This can be achieved via a crafted iframe, potentially impacting data integrity.

This issue allows maliciously crafted web content to violate iframe sandboxing policy due to inadequate iframe sandbox enforcement. The estimated number of potentially affected devices worldwide is not specified. There is no information about real-world incidents where this issue was exploited.

The issue is related to the security interface of the popup blocker in Google Chrome, which is associated with access control deficiencies. Exploitation of this issue may allow a remote attacker to impact data integrity through a specially crafted HTML page.