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APPLE-SA-2021-10-26-8 Additional information for
APPLE-SA-2021-09-20-5 Safari 15

Safari 15 addresses the following issues.
Information about the security content is also available at
https://support.apple.com/HT212816.

WebKit
Available for: macOS Big Sur and macOS Catalina
Impact: Processing maliciously crafted web content may lead to
arbitrary code execution
Description: A type confusion issue was addressed with improved state
handling.
CVE-2021-30818: Amar Menezes (@amarekano) of Zon8Research
Entry added October 25, 2021

WebKit
Available for: macOS Big Sur and macOS Catalina
Impact: An attacker in a privileged network position may be able to
bypass HSTS
Description: A logic issue was addressed with improved restrictions.
CVE-2021-30823: David Gullasch of Recurity Labs
Entry added October 25, 2021

WebKit
Available for: macOS Big Sur and macOS Catalina
Impact: Processing maliciously crafted web content may lead to
arbitrary code execution
Description: A use after free issue was addressed with improved
memory management.
CVE-2021-30809: an anonymous researcher
Entry added October 25, 2021

WebKit
Available for: macOS Big Sur and macOS Catalina
Impact: Processing maliciously crafted web content may lead to
arbitrary code execution
Description: A memory corruption issue was addressed with improved
memory handling.
CVE-2021-30846: Sergei Glazunov of Google Project Zero

WebKit
Available for: macOS Big Sur and macOS Catalina
Impact: Processing maliciously crafted web content may lead to code
execution
Description: A memory corruption issue was addressed with improved
memory handling.
CVE-2021-30848: Sergei Glazunov of Google Project Zero

WebKit
Available for: macOS Big Sur and macOS Catalina
Impact: Processing maliciously crafted web content may lead to
arbitrary code execution
Description: Multiple memory corruption issues were addressed with
improved memory handling.
CVE-2021-30849: Sergei Glazunov of Google Project Zero

WebKit
Available for: macOS Big Sur and macOS Catalina
Impact: Processing maliciously crafted web content may lead to code
execution
Description: A memory corruption vulnerability was addressed with
improved locking.
CVE-2021-30851: Samuel Groß of Google Project Zero

Installation note:

This update may be obtained from the Mac App Store.

Information will also be posted to the Apple Security Updates
web site: https://support.apple.com/kb/HT201222

This message is signed with Apple's Product Security PGP key,
and details are available at:
https://www.apple.com/support/security/pgp/

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