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ZMCIRT Vulnerability Bulletin
ZMC-2021.08.1.1500
Android OS: Multiple vulnerabilities
3rd August 2021
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Product: Android OS
Publisher: Android
Operating System: Android
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Unknown/Unspecified
Access Confidential Data -- Unknown/Unspecified
Reduced Security -- Unknown/Unspecified
Resolution: Patch/Upgrade
CVE Names: CVE-2021-30261 CVE-2021-30260 CVE-2021-28375
CVE-2021-3347 CVE-2021-1978 CVE-2021-1976
CVE-2021-1972 CVE-2021-1947 CVE-2021-1939
CVE-2021-1920 CVE-2021-1919 CVE-2021-1916
CVE-2021-1914 CVE-2021-1904 CVE-2021-0646
CVE-2021-0645 CVE-2021-0642 CVE-2021-0641
CVE-2021-0640 CVE-2021-0639 CVE-2021-0593
CVE-2021-0591 CVE-2021-0584 CVE-2021-0582
CVE-2021-0581 CVE-2021-0580 CVE-2021-0579
CVE-2021-0578 CVE-2021-0576 CVE-2021-0574
CVE-2021-0573 CVE-2021-0519 CVE-2020-14381
Reference: ESB-2021.2439
ESB-2021.2136
ESB-2021.1624
ESB-2020.3516
Original Bulletin:
https://source.android.com/security/bulletin/2021-08-01
Android Security Bulletin-August 2021
Published August 2, 2021
The Android Security Bulletin contains details of security vulnerabilities
affecting Android devices. Security patch levels of 2021-08-05 or later address
all of these issues. To learn how to check a device's security patch level, see
Check and update your Android version .
Android partners are notified of all issues at least a month before
publication. Source code patches for these issues will be released to the
Android Open Source Project (AOSP) repository in the next 48 hours. We will
revise this bulletin with the AOSP links when they are available.
The most severe of these issues is a high security vulnerability in the Media
Framework component that could enable a local malicious application to bypass
operating system protections that isolate application data from other
applications. The severity assessment is based on the effect that exploiting
the vulnerability would possibly have on an affected device, assuming the
platform and service mitigations are turned off for development purposes or if
successfully bypassed.
Refer to the Android and Google Play Protect mitigations section for details on
the Android security platform protections and Google Play Protect, which
improve the security of the Android platform.
Note : Information on the latest over-the-air update (OTA) and firmware images
for Google devices is available in the August 2021 Pixel Update Bulletin .
Android and Google service mitigations
This is a summary of the mitigations provided by the Android security platform
and service protections such as Google Play Protect . These capabilities reduce
the likelihood that security vulnerabilities could be successfully exploited on
Android.
o Exploitation for many issues on Android is made more difficult by
enhancements in newer versions of the Android platform. We encourage all
users to update to the latest version of Android where possible.
o The Android security team actively monitors for abuse through Google Play
Protect and warns users about Potentially Harmful Applications . Google
Play Protect is enabled by default on devices with Google Mobile Services ,
and is especially important for users who install apps from outside of
Google Play.
2021-08-01 security patch level vulnerability details
In the sections below, we provide details for each of the security
vulnerabilities that apply to the 2021-08-01 patch level. Vulnerabilities are
grouped under the component they affect. Issues are described in the tables
below and include CVE ID, associated references, type of vulnerability ,
severity , and updated AOSP versions (where applicable). When available, we
link the public change that addressed the issue to the bug ID, like the AOSP
change list. When multiple changes relate to a single bug, additional
references are linked to numbers following the bug ID. Devices with Android 10
and later may receive security updates as well as Google Play system updates .
Framework
The most severe vulnerability in this section could enable a local malicious
application to bypass user interaction requirements in order to gain access to
additional permissions.
CVE References Type Severity Updated AOSP versions
CVE-2021-0640 A-187957589 EoP High 9, 10, 11
CVE-2021-0645 A-157320644 EoP High 11
CVE-2021-0646 A-153352319 EoP High 8.1, 9, 10, 11
Media Framework
The vulnerability in this section could enable a local malicious application to
bypass operating system protections that isolate application data from other
applications.
CVE References Type Severity Updated AOSP versions
CVE-2021-0519 A-176533109 ID High 10, 11
EoP High 8.1, 9
System
The most severe vulnerability in this section could enable a local attacker
using a specially crafted transmission to gain access to additional
permissions.
CVE References Type Severity Updated AOSP versions
CVE-2021-0591 A-179386960 EoP High 8.1, 9, 10, 11
CVE-2021-0593 A-179386068 EoP High 8.1, 9, 10, 11
CVE-2021-0584 A-179289794 ID High 8.1, 9, 10, 11
CVE-2021-0641 A-185235454 ID High 8.1, 9, 10, 11
CVE-2021-0642 A-185126149 ID High 8.1, 9, 10, 11
Google Play system updates
The following issues are included in Project Mainline components.
Component CVE
Statsd CVE-2021-0640
Media Codecs CVE-2021-0519
Media Codecs, Media Framework components CVE-2021-0584
2021-08-05 security patch level vulnerability details
In the sections below, we provide details for each of the security
vulnerabilities that apply to the 2021-08-05 patch level. Vulnerabilities are
grouped under the component they affect. Issues are described in the tables
below and include CVE ID, associated references, type of vulnerability ,
severity , and updated AOSP versions (where applicable). When available, we
link the public change that addressed the issue to the bug ID, like the AOSP
change list. When multiple changes relate to a single bug, additional
references are linked to numbers following the bug ID.
Kernel components
The most severe vulnerability in this section could result in arbitrary kernel
code execution due to a use after free.
CVE References Type Severity Component
CVE-2020-14381 A-175193031 EoP High Futex
Upstream kernel
CVE-2021-3347 A-171705902 EoP High Futex
Upstream kernel
CVE-2021-28375 A-183188047 EoP High FastRPC
Upstream kernel
MediaTek components
These vulnerabilities affect MediaTek components and further details are
available directly from MediaTek. The severity assessment of these issues is
provided directly by MediaTek.
CVE References Severity Component
CVE-2021-0573 A-187231635 High asf extractor
M-ALPS05489195 *
CVE-2021-0574 A-187234876 High asf extractor
M-ALPS05561346 *
CVE-2021-0576 A-187236084 High flv extractor
M-ALPS05517392 *
CVE-2021-0578 A-187161772 High wifi driver
M-ALPS05551422 *
CVE-2021-0579 A-187231636 High wifi driver
M-ALPS05551426 *
CVE-2021-0580 A-187231637 High wifi driver
M-ALPS05560223 *
CVE-2021-0581 A-187231638 High wifi driver
M-ALPS05560246 *
CVE-2021-0582 A-187149601 High wifi driver
M-ALPS05560246 *
Widevine DRM
This vulnerability affects Widevine DRM components and further details are
available directly from Widevine DRM. The severity assessment of this issue is
provided directly by Widevine DRM.
CVE References Severity Component
CVE-2021-0639 A-190724551 * High Widevine
Qualcomm components
These vulnerabilities affect Qualcomm components and are described in further
detail in the appropriate Qualcomm security bulletin or security alert. The
severity assessment of these issues is provided directly by Qualcomm.
CVE References Severity Component
CVE-2021-1972 A-187073198 Critical WLAN
QC-CR#2823861
CVE-2021-1976 A-187074482 Critical WLAN
QC-CR#2857392
A-175037520
CVE-2021-1904 QC-CR#2778197 High Kernel
QC-CR#2835930
CVE-2021-1939 A-187073199 High Display
QC-CR#2826994
CVE-2021-1947 A-187074483 High Display
QC-CR#2840102 [ 2 ] [ 3 ] [ 4 ]
CVE-2021-1978 A-187074565 High WLAN
QC-CR#2859124
Qualcomm closed-source components
These vulnerabilities affect Qualcomm closed-source components and are
described in further detail in the appropriate Qualcomm security bulletin or
security alert. The severity assessment of these issues is provided directly by
Qualcomm.
CVE References Severity Component
CVE-2021-1916 A-179040380 * Critical Closed-source component
CVE-2021-1919 A-179040019 * Critical Closed-source component
CVE-2021-1920 A-179040550 * Critical Closed-source component
CVE-2021-1914 A-179040552 * High Closed-source component
CVE-2021-30260 A-187073203 * High Closed-source component
CVE-2021-30261 A-187073202 * High Closed-source component
Common questions and answers
This section answers common questions that may occur after reading this
bulletin.
1. How do I determine if my device is updated to address these issues
To learn how to check a device's security patch level, see Check and update
your Android version .
o Security patch levels of 2021-08-01 or later address all issues associated
with the 2021-08-01 security patch level.
o Security patch levels of 2021-08-05 or later address all issues associated
with the 2021-08-05 security patch level and all previous patch levels.
Device manufacturers that include these updates should set the patch string
level to:
o [ro.build.version.security_patch]:[2021-08-01]
o [ro.build.version.security_patch]:[2021-08-05]
For some devices on Android 10 or later, the Google Play system update will
have a date string that matches the 2021-08-01 security patch level. Please see
this article for more details on how to install security updates.
2. Why does this bulletin have two security patch levels
This bulletin has two security patch levels so that Android partners have the
flexibility to fix a subset of vulnerabilities that are similar across all
Android devices more quickly. Android partners are encouraged to fix all issues
in this bulletin and use the latest security patch level.
o Devices that use the 2021-08-01 security patch level must include all
issues associated with that security patch level, as well as fixes for all
issues reported in previous security bulletins.
o Devices that use the security patch level of 2021-08-05 or newer must
include all applicable patches in this (and previous) security bulletins.
Partners are encouraged to bundle the fixes for all issues they are addressing
in a single update.
3. What do the entries in the Type column mean
Entries in the Type column of the vulnerability details table reference the
classification of the security vulnerability.
Abbreviation Definition
RCE Remote code execution
EoP Elevation of privilege
ID Information disclosure
DoS Denial of service
N/A Classification not available
4. What do the entries in the References column mean
Entries under the References column of the vulnerability details table may
contain a prefix identifying the organization to which the reference value
belongs.
Prefix Reference
A- Android bug ID
QC- Qualcomm reference number
M- MediaTek reference number
N- NVIDIA reference number
B- Broadcom reference number
5. What does an * next to the Android bug ID in the References column mean
Issues that are not publicly available have an * next to the corresponding
reference ID. The update for that issue is generally contained in the latest
binary drivers for Pixel devices available from the Google Developer site .
6. Why are security vulnerabilities split between this bulletin and device /
partner security bulletins, such as the Pixel bulletin
Security vulnerabilities that are documented in this security bulletin are
required to declare the latest security patch level on Android devices.
Additional security vulnerabilities that are documented in the device / partner
security bulletins are not required for declaring a security patch level.
Android device and chipset manufacturers may also publish security
vulnerability details specific to their products, such as Google , Huawei , LGE
, Motorola , Nokia , or Samsung .
Versions
Version Date Notes
1.0 August 2, 2021 Bulletin published
ZMCIRT has made every effort to ensure that the information contained
in this document is accurate. However, the decision to use the information
described is the responsibility of each user or organisation. 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. ZMCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.
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