PT-2021-13585 · Apple+9 · Ipados+15

Eliya Stein · Published 2021-02-01 · Updated 2023-09-20 · CVE-2021-1801

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

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.

Fix

Related Identifiers

ALSA-2021:4381

ALT-PU-2021-1527

CESA-2021_4381

CVE-2021-1801

DSA-4877-1

MGASA-2021-0181

OPENSUSE-SU-2021:0637-1

OPENSUSE-SU-2021_0637-1

RHSA-2021:4381

RHSA-2021_4381

RHSA-2025:10364

RLSA-2021:4381

SUSE-SU-2021:1430-1

SUSE-SU-2021:1499-1

SUSE-SU-2021:1990-1

USN-4894-1

Affected Products

Alt Linux

Almalinux

Astra Linux

Centos

Linuxmint

Apple Macos

Red Hat

Rocky Linux

Security Update

Suse

Ubuntu

Ios

Ipados

Macos Big Sur

Tvos

Watchos

References · 175

• https://osv.dev/vulnerability/SUSE-SU-2021:1990-1 · Vendor Advisory
• https://security.gentoo.org/glsa/202104-03 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-1765 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-1789 · Vendor Advisory
• https://osv.dev/vulnerability/DSA-4877-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:1430-1 · Vendor Advisory
• https://support.apple.com/en-us/HT212148 · Vendor Advisory
• https://errata.rockylinux.org/RLSA-2021:4381 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-1801 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-4894-1 · Vendor Advisory
• https://osv.dev/vulnerability/MGASA-2021-0181 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU · Vendor Advisory
• https://errata.almalinux.org/8/ALSA-2021-4381.html · Vendor Advisory
• https://support.apple.com/en-us/HT212149 · Vendor Advisory
• https://osv.dev/vulnerability/RLSA-2021:4381 · Vendor Advisory