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AUSCERT External Security Bulletin Redistribution
ESB-2021.3092
APSB21-55 Security update available for Adobe Acrobat and Reader
15 September 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Adobe Acrobat
Adobe Reader
Publisher: Adobe
Operating System: Windows
Mac OS
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Denial of Service -- Existing Account
Access Confidential Data -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-39863 CVE-2021-39861 CVE-2021-39860
CVE-2021-39859 CVE-2021-39858 CVE-2021-39857
CVE-2021-39856 CVE-2021-39855 CVE-2021-39854
CVE-2021-39853 CVE-2021-39852 CVE-2021-39851
CVE-2021-39850 CVE-2021-39849 CVE-2021-39846
CVE-2021-39845 CVE-2021-39844 CVE-2021-39843
CVE-2021-39842 CVE-2021-39841 CVE-2021-39840
CVE-2021-39839 CVE-2021-39838 CVE-2021-39837
CVE-2021-39836 CVE-2021-35982
Original Bulletin:
https://helpx.adobe.com/security/products/acrobat/apsb21-55.html
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Security update available for Adobe Acrobat and Reader | APSB21-55
Bulletin ID Date Published Priority
APSB21-55 September 14, 2021 2
Summary
Adobe has released security updates for Adobe Acrobat and Reader for Windows
and macOS. These updates address multiple critical , important 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 2021.005.20060 and earlier Windows
versions
Acrobat Reader DC Continuous 2021.005.20060 and earlier Windows
versions
Acrobat DC Continuous 2021.005.20058 and earlier macOS
versions
Acrobat Reader DC Continuous 2021.005.20058 and earlier macOS
versions
Acrobat 2020 Classic 2020.004.30006 and earlier Windows &
2020 versions macOS
Acrobat Reader Classic 2020.004.30006 and earlier Windows &
2020 2020 versions macOS
Acrobat 2017 Classic 2017.011.30199 and earlier Windows &
2017 versions macOS
Acrobat Reader Classic 2017.011.30199 and earlier Windows &
2017 2017 versions macOS
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 2021.007.20091 Windows and 2 Release
macOS Notes
Acrobat Reader Continuous 2021.007.20091 Windows and 2 Release
DC macOS Notes
Acrobat 2020 Classic 2020.004.30015 Windows and 2 Release
2020 macOS Notes
Acrobat Reader Classic 2020.004.30015 Windows and 2 Release
2020 2020 macOS Notes
Acrobat 2017 Classic 2017.011.30202 Windows and 2 Release
2017 macOS Notes
Acrobat Reader Classic 2017.011.30202 Windows and 2 Release
2017 2017 macOS Notes
Vulnerability Details
+-------------+-----------------+---------+----------+--------------------------+----------------------+
| | Vulnerability | |CVSS base | | |
|Vulnerability| Impact |Severity | score | CVSS vector | CVE Number |
| Category | | | | | |
+-------------+-----------------+---------+----------+--------------------------+----------------------+
|Type |Arbitrary code |Critical |7.8 |CVSS:3.1/AV:L/AC:L/PR:N/ |CVE-2021-39841 |
|Confusion ( |execution | | |UI:R/S:U/C:H/I:H/A:H | |
|CWE-843 ) | | | | | |
+-------------+-----------------+---------+----------+--------------------------+----------------------+
|Heap-based |Arbitrary code |Critical |8.8 |CVSS:3.1/AV:N/AC:L/PR:N/ |CVE-2021-39863 |
|Buffer |execution | | |UI:R/S:U/C:H/I:H/A:H | |
|Overflow | | | | | |
| | | | | | |
|( CWE-122 ) | | | | | |
+-------------+-----------------+---------+----------+--------------------------+----------------------+
|Information |Arbitrary file |Moderate |3.8 |CVSS:3.0/AV:N/AC:H/PR:N/ |CVE-2021-39857 |
|Exposure |system read | | |UI:R/S:U/C:L/I:N/A:N | |
| | | | | |CVE-2021-39856 |
|( CWE-200 ) | | | | | |
| | | | | |CVE-2021-39855 |
+-------------+-----------------+---------+----------+--------------------------+----------------------+
|Out-of-bounds|Memory leak |Critical |7.7 |CVSS:3.0/AV:L/AC:H/PR:N/ |CVE-2021-39844 |
|Read | | | |UI:R/S:C/C:N/I:L/A:H | |
| | | | | | |
|( CWE-125 ) | | | | | |
+-------------+-----------------+---------+----------+--------------------------+----------------------+
|Out-of-bounds|Memory leak |Important|5.3 |CVSS:3.0/AV:L/AC:L/PR:N/ |CVE-2021-39861 |
|Read | | | |UI:R/S:U/C:L/I:L/A:L | |
| | | | | | |
|( CWE-125 ) | | | | | |
+-------------+-----------------+---------+----------+--------------------------+----------------------+
|Out-of-bounds|Arbitrary file |Moderate |3.3 |CVSS:3.0/AV:L/AC:L/PR:N/ |CVE-2021-39858 |
|Read |system read | | |UI:R/S:U/C:L/I:N/A:N | |
| | | | | | |
|( CWE-125 ) | | | | | |
+-------------+-----------------+---------+----------+--------------------------+----------------------+
|Out-of-bounds|Memory leak |Critical |7.8 |CVSS:3.1/AV:L/AC:L/PR:N/ |CVE-2021-39843 |
|Write | | | |UI:R/S:U/C:H/I:H/A:H | |
| | | | | | |
|( CWE-787 ) | | | | | |
+-------------+-----------------+---------+----------+--------------------------+----------------------+
|Stack-based |Arbitrary code |Critical |7.7 |CVSS:3.0/AV:L/AC:H/PR:N/ |CVE-2021-39846 |
|Buffer |execution | | |UI:R/S:C/C:N/I:L/A:H | |
|Overflow | | | | |CVE-2021-39845 |
| | | | | | |
|( CWE-121 ) | | | | | |
+-------------+-----------------+---------+----------+--------------------------+----------------------+
|Uncontrolled |Arbitrary code |Important|7.3 |CVSS:3.0/AV:L/AC:L/PR:L/ |CVE-2021-35982 |
|Search Path |execution | | |UI:R/S:U/C:H/I:H/A:H | |
|Element | | | | | |
| | | | | | |
|( CWE-427 ) | | | | | |
+-------------+-----------------+---------+----------+--------------------------+----------------------+
|Use After |Arbitrary code |Important|4.4 |CVSS:3.0/AV:L/AC:H/PR:L/ |CVE-2021-39859 |
|Free |execution | | |UI:R/S:U/C:L/I:L/A:N | |
| | | | | | |
|( CWE-416 ) | | | | | |
+-------------+-----------------+---------+----------+--------------------------+----------------------+
|Use After |Arbitrary code |Critical |7.8 |CVSS:3.0/AV:L/AC:L/PR:N/ |CVE-2021-39840 |
|Free |execution | | |UI:R/S:U/C:H/I:H/A:H | |
| | | | | |CVE-2021-39842 |
|( CWE-416 ) | | | | | |
| | | | | |CVE-2021-39839 |
| | | | | | |
| | | | | |CVE-2021-39838 |
| | | | | | |
| | | | | |CVE-2021-39837 |
| | | | | | |
| | | | | |CVE-2021-39836 |
+-------------+-----------------+---------+----------+--------------------------+----------------------+
|NULL Pointer |Memory leak |Important|5.3 |CVSS:3.0/AV:L/AC:L/PR:N/ |CVE-2021-39860 |
|Dereference (| | | |UI:R/S:U/C:L/I:L/A:L | |
|CWE-476 ) | | | | | |
+-------------+-----------------+---------+----------+--------------------------+----------------------+
|NULL Pointer |Application |Critical |7.2 |CVSS:3.0/AV:L/AC:H/PR:H/ |CVE-2021-39852 |
|Dereference (|denial-of-service| | |UI:R/S:C/C:H/I:H/A:H | |
|CWE-476 ) | | | | | |
+-------------+-----------------+---------+----------+--------------------------+----------------------+
|NULL Pointer |Application |Important|5.5 |CVSS:3.0/AV:L/AC:L/PR:N/ |CVE-2021-39854 |
|Dereference (|denial-of-service| | |UI:R/S:U/C:N/I:N/A:H | |
|CWE-476 ) | | | | |CVE-2021-39853 |
| | | | | | |
| | | | | |CVE-2021-39850 |
| | | | | | |
| | | | | |CVE-2021-39849 |
+-------------+-----------------+---------+----------+--------------------------+----------------------+
|NULL Pointer |Application |Important|6.6 |CVSS:3.0/AV:L/AC:H/PR:N/ |CVE-2021-39851 |
|Dereference (|denial-of-service| | |UI:R/S:C/C:L/I:L/A:L | |
|CWE-476 ) | | | | | |
+-------------+-----------------+---------+----------+--------------------------+----------------------+
Acknowledgements
Adobe would like to thank the following for reporting the relevant issues and
for working with Adobe to help protect our customers:
o Mark Vincent Yason (@MarkYason) working with Trend Micro Zero Day
Initiative (CVE-2021-39841, CVE-2021-39836, CVE-2021-39837, CVE-2021-39838,
CVE-2021-39839, CVE-2021-39840)
o Haboob labs (CVE-2021-39859, CVE-2021-39860, CVE-2021-39861,
CVE-2021-39843, CVE-2021-39844, CVE-2021-39845, CVE-2021-39846)
o Robert Chen (deepsurface-robert) ( CVE-2021-35982)
o xu peng (xupeng_1231) (CVE-2021-39854, CVE-2021-39853, "CVE-2021-39852,
CVE-2021-39851, "CVE-2021-39850, "CVE-2021-39849)
o j00sean (CVE-2021-39857, CVE-2021-39856, CVE-2021-39855, CVE-2021-39842)
o Andrei Stefan from Exodus Intelligence ( exodusintel.com ) (CVE-2021-39863)
o Qiao Li Of Baidu Security Lab working with Trend Micro Zero Day Initiative
(CVE-2021-39858)
For more information, visit https://helpx.adobe.com/security.html , or email
PSIRT@adobe.com.
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