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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

===========================================================================

        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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