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AUSCERT External Security Bulletin Redistribution
ESB-2021.2374
APSB21-51 Security update available for Adobe Acrobat and Reader
14 July 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Adobe Acrobat and Reader
Publisher: Adobe
Operating System: Windows
Mac OS
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Increased Privileges -- Remote with User Interaction
Overwrite Arbitrary Files -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-35988 CVE-2021-35987 CVE-2021-35986
CVE-2021-35985 CVE-2021-35984 CVE-2021-35983
CVE-2021-35981 CVE-2021-35980 CVE-2021-28644
CVE-2021-28643 CVE-2021-28642 CVE-2021-28641
CVE-2021-28640 CVE-2021-28639 CVE-2021-28638
CVE-2021-28637 CVE-2021-28636 CVE-2021-28635
CVE-2021-28634 CVE-2021-3598
Reference: ESB-2021.2306
ESB-2021.2241
ESB-2021.2205
Original Bulletin:
https://helpx.adobe.com/security/products/acrobat/apsb21-51.html
Comment: This advisory references vulnerabilities in products which run on
platforms other than Adobe. It is recommended that administrators
running Adobe Acrobat and Reader check for an updated version of the
software for their operating system.
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Security update available for Adobe Acrobat and Reader | APSB21-51
Bulletin ID Date Published Priority
APSB21-51 July 13, 2021 2
Summary
Adobe has released security updates for Adobe Acrobat and Reader for Windows
and macOS. These updates address multiple critical and important
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 2021.005.20054 and earlier Windows and
versions macOS
Acrobat Reader DC Continuous 2021.005.20054 and earlier Windows and
versions macOS
Acrobat 2020 Classic 2020.004.30005 and earlier Windows & macOS
2020 versions
Acrobat Reader Classic 2020.004.30005 and earlier Windows & macOS
2020 2020 versions
Acrobat 2017 Classic 2017.011.30197 and earlier Windows & macOS
2017 versions
Acrobat Reader Classic 2017.011.30197 and earlier Windows & macOS
2017 2017 versions
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 2021.005.20058 Windows and 2 Release
macOS Notes
Acrobat Reader Continuous 2021.005.20058 Windows and 2 Release
DC macOS Notes
Acrobat 2020 Classic 2020.004.30006 Windows and 2 Release
2020 macOS Notes
Acrobat Reader Classic 2020.004.30006 Windows and 2 Release
2020 2020 macOS Notes
Acrobat 2017 Classic 2017.011.30199 Windows and 2 Release
2017 macOS Notes
Acrobat Reader Classic 2017.011.30199 Windows and 2 Release
2017 2017 macOS Notes
Vulnerability Details
+-------------+-----------------+---------+-----+----------+------------------+
| | Vulnerability | |CVSS | CVSS | |
|Vulnerability| Impact |Severity |base | vector | CVE Number |
| Category | | |score| | |
+-------------+-----------------+---------+-----+----------+------------------+
|Out-of-bounds| | | |CVSS:3.1/ | |
|Read |Privilege | | |AV:N/AC:L/|CVE-2021-35988 |
| |escalation |Important|4.3 |PR:N/UI:R/| |
|( CWE-125 ) | | | |S:U/C:L/ |CVE-2021-35987 |
| | | | |I:N/A:N | |
+-------------+-----------------+---------+-----+----------+------------------+
|Path | | | |CVSS:3.1/ | |
|Traversal |Arbitrary file | | |AV:N/AC:L/|CVE-2021-35980 |
| |system read |Critical |7.1 |PR:N/UI:R/| |
|( CWE-22 ) | | | |S:U/C:N/ |CVE-2021-28644 |
| | | | |I:H/A:L | |
+-------------+-----------------+---------+-----+----------+------------------+
|Use After | | | |CVSS:3.1/ | |
|Free |Arbitrary code | | |AV:N/AC:L/| |
| |execution |Critical |8.0 |PR:L/UI:R/|CVE-2021-28640 |
|( CWE-416 ) | | | |S:U/C:H/ | |
| | | | |I:H/A:H | |
+-------------+-----------------+---------+-----+----------+------------------+
|Type | | | |CVSS:3.1/ | |
|Confusion |Arbitrary code | | |AV:L/AC:L/| |
| |execution |Critical |7.8 |PR:N/UI:R/|CVE-2021-28643 |
|( CWE-843 ) | | | |S:U/C:H/ | |
| | | | |I:H/A:H | |
+-------------+-----------------+---------+-----+----------+------------------+
|Use After | | | |CVSS:3.1/ | |
|Free |Arbitrary code | | |AV:N/AC:L/|CVE-2021-28641 |
| |execution |Critical |8.8 |PR:N/UI:R/| |
|( CWE-416 ) | | | |S:U/C:H/ |CVE-2021-28639 |
| | | | |I:H/A:H | |
+-------------+-----------------+---------+-----+----------+------------------+
|Out-of-bounds| | | |CVSS:3.1/ | |
|Write |Arbitrary file | | |AV:N/AC:L/| |
| |system write |Critical |8.8 |PR:N/UI:R/|CVE-2021-28642 |
|( CWE-787 ) | | | |S:U/C:H/ | |
| | | | |I:H/A:H | |
+-------------+-----------------+---------+-----+----------+------------------+
|Out-of-bounds| | | |CVSS:3.0/ | |
|Read | | | |AV:L/AC:H/| |
| |Memory leak |Critical |7.7 |PR:N/UI:R/|CVE-2021-28637 |
|( CWE-125 ) | | | |S:C/C:H/ | |
| | | | |I:L/A:N | |
+-------------+-----------------+---------+-----+----------+------------------+
|Type | | | |CVSS:3.1/ | |
|Confusion |Arbitrary file | | |AV:N/AC:L/| |
| |system read |Important|4.3 |PR:N/UI:R/|CVE-2021-35986 |
|( CWE-843 ) | | | |S:U/C:L/ | |
| | | | |I:N/A:N | |
+-------------+-----------------+---------+-----+----------+------------------+
|Heap-based | | | |CVSS:3.1/ | |
|Buffer |Arbitrary code | | |AV:N/AC:L/| |
|Overflow |execution |Critical |8.8 |PR:N/UI:R/|CVE-2021-28638 |
| | | | |S:U/C:H/ | |
|( CWE-122 ) | | | |I:H/A:H | |
+-------------+-----------------+---------+-----+----------+------------------+
|NULL Pointer | | | |CVSS:3.1/ | |
|Dereference |Application | | |AV:L/AC:L/|CVE-2021-35985 |
| |denial-of-service|Important|5.5 |PR:L/UI:N/| |
|( CWE-476 ) | | | |S:U/C:N/ |CVE-2021-35984 |
| | | | |I:N/A:H | |
+-------------+-----------------+---------+-----+----------+------------------+
|Uncontrolled | | | |CVSS:3.1/ | |
|Search Path |Arbitrary code | | |AV:L/AC:H/| |
|Element |execution |Critical |7.0 |PR:N/UI:R/|CVE-2021-28636 |
| | | | |S:U/C:H/ | |
|( CWE-427 ) | | | |I:H/A:H | |
+-------------+-----------------+---------+-----+----------+------------------+
|OS Command | | | |CVSS:3.1/ | |
|Injection |Arbitrary code | | |AV:L/AC:L/| |
| |execution |Critical |8.2 |PR:L/UI:R/|CVE-2021-28634 |
|( CWE-78 ) | | | |S:C/C:H/ | |
| | | | |I:H/A:H | |
+-------------+-----------------+---------+-----+----------+------------------+
|Use After | | | |CVSS:3.1/ |CVE-2021-35983 |
|Free |Arbitrary code | | |AV:L/AC:L/| |
| |execution |Critical |7.8 |PR:N/UI:R/|CVE-2021-35981 |
|( CWE-416 ) | | | |S:U/C:H/ | |
| | | | |I:H/A:H |CVE-2021-28635 |
+-------------+-----------------+---------+-----+----------+------------------+
Acknowledgements
Adobe would like to thank the following for reporting the relevant issues and
for working with Adobe to help protect our customers:
o Nipun Gupta , Ashfaq Ansari and Krishnakant Patil - CloudFuzz working with
Trend Micro Zero Day Initiative (CVE-2021-35983)
o Xu Peng from UCAS and Wang Yanhao from QiAnXin Technology Research
Institute working with Trend Micro Zero Day Initiative (CVE-2021-3598,
CVE-2021-28638)
o Habooblabs (CVE-2021-35980, CVE-2021-28644, CVE-2021-35988, CVE-2021-35987,
CVE-2021-28642, CVE-2021-28641, CVE-2021-35985, CVE-2021-35984,
CVE-2021-28637)
o Anonymous working with Trend Micro Zero Day Initiative (CVE-2021-28643,
CVE-2021-35986)
o o0xmuhe (CVE-2021-28640)
o Kc Udonsi (@glitchnsec) of Trend Micro Day Initiative (CVE-2021-28639)
o Noah (howsubtle) (CVE-2021-28634)
o xu peng (xupeng_1231) (CVE-2021-28635)
o Xavier Invers Fornells (m4gn3t1k) (CVE-2021-28636)
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