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APPLE-SA-2020-03-24-3 tvOS 13.4

tvOS 13.4 is now available and addresses the following:

ActionKit
Available for: Apple TV 4K and Apple TV HD
Impact: An application may be able to use an SSH client provided by
private frameworks
Description: This issue was addressed with a new entitlement.
CVE-2020-3917: Steven Troughton-Smith (@stroughtonsmith)

AppleMobileFileIntegrity
Available for: Apple TV 4K and Apple TV HD
Impact: An application may be able to use arbitrary entitlements
Description: This issue was addressed with improved checks.
CVE-2020-3883: Linus Henze (pinauten.de)

Icons
Available for: Apple TV 4K and Apple TV HD
Impact: A malicious application may be able to identify what other
applications a user has installed
Description: The issue was addressed with improved handling of icon
caches.
CVE-2020-9773: Chilik Tamir of Zimperium zLabs

Image Processing
Available for: Apple TV 4K and Apple TV HD
Impact: An application may be able to execute arbitrary code with
system privileges
Description: A use after free issue was addressed with improved
memory management.
CVE-2020-9768: Mohamed Ghannam (@_simo36)

IOHIDFamily
Available for: Apple TV 4K and Apple TV HD
Impact: A malicious application may be able to execute arbitrary code
with kernel privileges
Description: A memory initialization issue was addressed with
improved memory handling.
CVE-2020-3919: an anonymous researcher

Kernel
Available for: Apple TV 4K and Apple TV HD
Impact: An application may be able to read restricted memory
Description: A memory initialization issue was addressed with
improved memory handling.
CVE-2020-3914: pattern-f (@pattern_F_) of WaCai

Kernel
Available for: Apple TV 4K and Apple TV HD
Impact: A malicious application may be able to execute arbitrary code
with kernel privileges
Description: Multiple memory corruption issues were addressed with
improved state management.
CVE-2020-9785: Proteas of Qihoo 360 Nirvan Team

libxml2
Available for: Apple TV 4K and Apple TV HD
Impact: Multiple issues in libxml2
Description: A buffer overflow was addressed with improved bounds
checking.
CVE-2020-3909: LGTM.com
CVE-2020-3911: found by OSS-Fuzz

libxml2
Available for: Apple TV 4K and Apple TV HD
Impact: Multiple issues in libxml2
Description: A buffer overflow was addressed with improved size
validation.
CVE-2020-3910: LGTM.com

WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: Processing maliciously crafted web content may lead to
arbitrary code execution
Description: A memory corruption issue was addressed with improved
memory handling.
CVE-2020-3895: grigoritchy
CVE-2020-3900: Dongzhuo Zhao working with ADLab of Venustech

WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: An application may be able to read restricted memory
Description: A race condition was addressed with additional
validation.
CVE-2020-3894: Sergei Glazunov of Google Project Zero

WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: A remote attacker may be able to cause arbitrary code
execution
Description: A memory consumption issue was addressed with improved
memory handling.
CVE-2020-3899: found by OSS-Fuzz

WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: Processing maliciously crafted web content may lead to a
cross site scripting attack
Description: An input validation issue was addressed with improved
input validation.
CVE-2020-3902: Yiğit Can YILMAZ (@yilmazcanyigit)

WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: Processing maliciously crafted web content may lead to
arbitrary code execution
Description: A type confusion issue was addressed with improved
memory handling.
CVE-2020-3901: Benjamin Randazzo (@____benjamin)

WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: A download's origin may be incorrectly associated
Description: A logic issue was addressed with improved restrictions.
CVE-2020-3887: Ryan Pickren (ryanpickren.com)

WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: Processing maliciously crafted web content may lead to code
execution
Description: A use after free issue was addressed with improved
memory management.
CVE-2020-9783: Apple

WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: A remote attacker may be able to cause arbitrary code
execution
Description: A type confusion issue was addressed with improved
memory handling.
CVE-2020-3897: Brendan Draper (@6r3nd4n) working with Trend Micro’s
Zero Day Initiative

WebKit Page Loading
Available for: Apple TV 4K and Apple TV HD
Impact: A file URL may be incorrectly processed
Description: A logic issue was addressed with improved restrictions.
CVE-2020-3885: Ryan Pickren (ryanpickren.com)

Additional recognition

FontParser
We would like to acknowledge Matthew Denton of Google Chrome for
their assistance.

Kernel
We would like to acknowledge Siguza for their assistance.

LinkPresentation
We would like to acknowledge Travis for their assistance.

WebKit
We would like to acknowledge Emilio Cobos Álvarez of Mozilla, Samuel
Groß of Google Project Zero, and an anonymous researcher for their
assistance.

Installation note:

Apple TV will periodically check for software updates. Alternatively,
you may manually check for software updates by selecting
"Settings -> System -> Software Update -> Update Software."

To check the current version of software, select
"Settings -> General -> About."
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