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AUSCERT External Security Bulletin Redistribution
ESB-2021.3406
APSB21-104 Security update available for Adobe Acrobat and Reader
14 October 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Acrobat DC
Acrobat Reader DC
Acrobat 2020
Acrobat Reader 2020
Acrobat 2017
Acrobat Reader 2017
Publisher: Adobe
Operating System: Windows
macOS
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-40731 CVE-2021-40730 CVE-2021-40729
CVE-2021-40728
Original Bulletin:
https://helpx.adobe.com/security/products/acrobat/apsb21-104.html
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Security update for Adobe Acrobat and Reader | APSB21-104
Bulletin ID Date Published Priority
APSB21-104 October 12, 2021 2
Summary
Adobe has released security updates for Adobe Acrobat and Reader for Windows
and macOS. These updates address multiple critical and moderate
vulnerabilities. Successful exploitation could lead to arbitrary code execution
in the context of the current user.
Affected Versions
Product Track Affected Versions Platform
Acrobat DC Continuous 21.007.20095 and earlier Windows
versions
21.007.20095 and earlier
Acrobat Reader DC Continuous versions Windows
Acrobat DC Continuous 21.007.20096 and earlier macOS
versions
Acrobat Reader DC Continuous 21.007.20096 and earlier macOS
versions
Acrobat 2020 Classic 2020 20.004.30015 and earlier Windows &
versions macOS
Acrobat Reader Classic 2020 20.004.30015 and earlier Windows &
2020 versions macOS
Acrobat 2017 Classic 2017 17.011.30202 and earlier Windows &
versions macOS
Acrobat Reader Classic 2017 17.011.30202 and earlier Windows &
2017 versions macOS
For questions regarding Acrobat DC, please visit the Acrobat DC FAQ page .
For questions regarding Acrobat Reader DC, please visit the Acrobat Reader DC
FAQ page .
Solution
Adobe recommends users update their software installations to the latest
versions by following the instructions below.
The latest product versions are available to end users via one of the following
methods:
o Users can update their product installations manually by choosing Help >
Check for Updates.
o The products will update automatically, without requiring user
intervention, when updates are detected.
o The full Acrobat Reader installer can be downloaded from the Acrobat Reader
Download Center .
For IT administrators (managed environments):
o Refer to the specific release note version for links to installers.
o Install updates via your preferred methodology, such as AIP-GPO,
bootstrapper, SCUP/SCCM (Windows), or on macOS, Apple Remote Desktop and
SSH.
Adobe categorizes these updates with the following priority ratings and
recommends users update their installation to the newest version:
Product Track Updated Platform Priority Availability
Versions Rating
Acrobat DC Continuous 21.007.20099 Windows and 2 Release
macOS Notes
Acrobat Reader Continuous 21.007.20099 Windows and 2 Release
DC macOS Notes
Acrobat 2020 Classic 20.004.30017 Windows and 2 Release
2020 macOS Notes
Acrobat Reader Classic 20.004.30017 Windows and 2 Release
2020 2020 macOS Notes
Acrobat 2017 Classic 17.011.30204 Windows and 2 Release
2017 macOS Notes
Acrobat Reader Classic 17.011.30204 Windows and 2 Release
2017 2017 macOS Notes
Vulnerability Details
+-------------+-------------+--------+-----+---------------+------------------+
| |Vulnerability| |CVSS | | |
|Vulnerability| Impact |Severity|base | CVSS vector | CVE Number |
| Category | | |score| | |
+-------------+-------------+--------+-----+---------------+------------------+
|Use After |Arbitrary | | |CVSS:3.1/AV:L/ | |
|Free ( |code |Critical|7.8 |AC:L/PR:N/UI:R/|CVE-2021-40728 |
|CWE-416 ) |execution | | |S:U/C:H/I:H/A:H| |
| | | | | | |
+-------------+-------------+--------+-----+---------------+------------------+
|Out-of-bounds|Privilege | | |CVSS:3.1/AV:L/ | |
|Read ( |escalation |Moderate|3.3 |AC:L/PR:N/UI:R/|CVE-2021-40729 |
|CWE-125 ) | | | |S:U/C:L/I:N/A:N| |
+-------------+-------------+--------+-----+---------------+------------------+
|Use After |Privilege | | |CVSS:3.0/AV:L/ | |
|Free ( |escalation |Moderate|3.3 |AC:L/PR:N/UI:R/|CVE-2021-40730 |
|CWE-416 ) | | | |S:U/C:L/I:N/A:N| |
+-------------+-------------+--------+-----+---------------+------------------+
|Out-of-bounds|Arbitrary | | |CVSS:3.0/AV:L/ | |
|Write ( |code |Critical|7.8 |AC:L/PR:N/UI:R/|CVE-2021-40731 |
|CWE-787 ) |execution | | |S:U/C:H/I:H/A:H| |
+-------------+-------------+--------+-----+---------------+------------------+
Acknowledgements
Adobe would like to thank the following for reporting these issues and for
working with Adobe to help protect our customers:
o Habooblabs (CVE-2021-40728, CVE-2021-40729)
o Kai Lu of Zscaler's ThreatLabz (CVE-2021-40729)
o Anonymous working with Trend Micro Zero Day Initiative (CVE-2021-40730,
CVE-2021-40731)
Revisions
October 13th: Updated acknowledgements for CVE-2021-40729
For more information, visit https://helpx.adobe.com/security.html , or email
PSIRT@adobe.com.
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