Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2021.2488
APPLE-SA-2021-07-21-6 tvOS 14.7
22 July 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: tvOS
Publisher: Apple
Operating System: Apple iOS
Impact/Access: Root Compromise -- Existing Account
Execute Arbitrary Code/Commands -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Unauthorised Access -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-30802 CVE-2021-30797 CVE-2021-30795
CVE-2021-30789 CVE-2021-30788 CVE-2021-30785
CVE-2021-30781 CVE-2021-30780 CVE-2021-30779
CVE-2021-30776 CVE-2021-30775 CVE-2021-30774
CVE-2021-30773 CVE-2021-30770 CVE-2021-30769
CVE-2021-30768 CVE-2021-30760 CVE-2021-30759
CVE-2021-30758 CVE-2021-3518
Reference: ESB-2021.2487
ESB-2021.2485.2
Original Bulletin:
https://support.apple.com/HT212604
- --------------------------BEGIN INCLUDED TEXT--------------------
- -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
APPLE-SA-2021-07-21-6 tvOS 14.7
tvOS 14.7 addresses the following issues.
Information about the security content is also available at
https://support.apple.com/HT212604.
Audio
Available for: Apple TV 4K and Apple TV HD
Impact: A local attacker may be able to cause unexpected application
termination or arbitrary code execution
Description: This issue was addressed with improved checks.
CVE-2021-30781: tr3e
CoreAudio
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted audio file may lead to
arbitrary code execution
Description: A memory corruption issue was addressed with improved
state management.
CVE-2021-30775: JunDong Xie of Ant Security Light-Year Lab
CoreAudio
Available for: Apple TV 4K and Apple TV HD
Impact: Playing a malicious audio file may lead to an unexpected
application termination
Description: A logic issue was addressed with improved validation.
CVE-2021-30776: JunDong Xie of Ant Security Light-Year Lab
CoreText
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted font file may lead to
arbitrary code execution
Description: An out-of-bounds read was addressed with improved input
validation.
CVE-2021-30789: Mickey Jin (@patch1t) of Trend Micro, Sunglin of
Knownsec 404 team
Crash Reporter
Available for: Apple TV 4K and Apple TV HD
Impact: A malicious application may be able to gain root privileges
Description: A logic issue was addressed with improved validation.
CVE-2021-30774: Yizhuo Wang of Group of Software Security In
Progress (G.O.S.S.I.P) at Shanghai Jiao Tong University
CVMS
Available for: Apple TV 4K and Apple TV HD
Impact: A malicious application may be able to gain root privileges
Description: An out-of-bounds write issue was addressed with improved
bounds checking.
CVE-2021-30780: Tim Michaud(@TimGMichaud) of Zoom Video
Communications
dyld
Available for: Apple TV 4K and Apple TV HD
Impact: A sandboxed process may be able to circumvent sandbox
restrictions
Description: A logic issue was addressed with improved validation.
CVE-2021-30768: Linus Henze (pinauten.de)
FontParser
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted font file may lead to
arbitrary code execution
Description: An integer overflow was addressed through improved input
validation.
CVE-2021-30760: Sunglin of Knownsec 404 team
FontParser
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted tiff file may lead to a
denial-of-service or potentially disclose memory contents
Description: This issue was addressed with improved checks.
CVE-2021-30788: tr3e working with Trend Micro Zero Day Initiative
FontParser
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted font file may lead to
arbitrary code execution
Description: A stack overflow was addressed with improved input
validation.
CVE-2021-30759: hjy79425575 working with Trend Micro Zero Day
Initiative
Identity Service
Available for: Apple TV 4K and Apple TV HD
Impact: A malicious application may be able to bypass code signing
checks
Description: An issue in code signature validation was addressed with
improved checks.
CVE-2021-30773: Linus Henze (pinauten.de)
Image Processing
Available for: Apple TV 4K and Apple TV HD
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-2021-30802: Matthew Denton of Google Chrome Security
ImageIO
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted image may lead to arbitrary
code execution
Description: This issue was addressed with improved checks.
CVE-2021-30779: Jzhu, Ye Zhang(@co0py_Cat) of Baidu Security
ImageIO
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted image may lead to arbitrary
code execution
Description: A buffer overflow was addressed with improved bounds
checking.
CVE-2021-30785: CFF of Topsec Alpha Team, Mickey Jin (@patch1t) of
Trend Micro
Kernel
Available for: Apple TV 4K and Apple TV HD
Impact: A malicious attacker with arbitrary read and write capability
may be able to bypass Pointer Authentication
Description: A logic issue was addressed with improved state
management.
CVE-2021-30769: Linus Henze (pinauten.de)
Kernel
Available for: Apple TV 4K and Apple TV HD
Impact: An attacker that has already achieved kernel code execution
may be able to bypass kernel memory mitigations
Description: A logic issue was addressed with improved validation.
CVE-2021-30770: Linus Henze (pinauten.de)
libxml2
Available for: Apple TV 4K and Apple TV HD
Impact: A remote attacker may be able to cause arbitrary code
execution
Description: This issue was addressed with improved checks.
CVE-2021-3518
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 state
handling.
CVE-2021-30758: Christoph Guttandin of Media Codings
WebKit
Available for: Apple TV 4K and Apple TV HD
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-2021-30795: Sergei Glazunov of Google Project Zero
WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: Processing maliciously crafted web content may lead to code
execution
Description: This issue was addressed with improved checks.
CVE-2021-30797: Ivan Fratric of Google Project Zero
Additional recognition
Assets
We would like to acknowledge Cees Elzinga for their assistance.
CoreText
We would like to acknowledge Mickey Jin (@patch1t) of Trend Micro for
their assistance.
Safari
We would like to acknowledge an anonymous researcher for their
assistance.
Sandbox
We would like to acknowledge Csaba Fitzl (@theevilbit) of Offensive
Security 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."
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/
- -----BEGIN PGP SIGNATURE-----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=q0q7
- -----END PGP SIGNATURE-----
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967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=StV2
-----END PGP SIGNATURE-----