Bulletin ID
Last updated on
Security update available for Adobe Acrobat and Reader | APSB21-55
|
|
Date Published |
Priority |
|---|---|---|
|
APSB21-55 |
September 14, 2021 |
2 |
Summary
Affected Versions
|
Track |
Affected Versions |
Platform |
|
|
Acrobat DC |
Continuous |
2021.005.20060 and earlier versions |
Windows |
|
Acrobat Reader DC |
Continuous |
2021.005.20060 and earlier versions |
Windows |
|
Acrobat DC |
Continuous |
2021.005.20058 and earlier versions |
macOS |
|
Acrobat Reader DC |
Continuous |
2021.005.20058 and earlier versions |
macOS |
|
|
|
|
|
|
Acrobat 2020 |
Classic 2020 |
2020.004.30006 and earlier versions |
Windows & macOS |
|
Acrobat Reader 2020 |
Classic 2020 |
2020.004.30006 and earlier versions |
Windows & macOS |
|
|
|
|
|
|
Acrobat 2017 |
Classic 2017 |
2017.011.30199 and earlier versions |
Windows & macOS |
|
Acrobat Reader 2017 |
Classic 2017 |
2017.011.30199 and earlier versions |
Windows & 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:
Users can update their product installations manually by choosing Help > Check for Updates.
The products will update automatically, without requiring user intervention, when updates are detected.
The full Acrobat Reader installer can be downloaded from the Acrobat Reader Download Center.
For IT administrators (managed environments):
Refer to the specific release note version for links to installers.
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:
|
Track |
Updated Versions |
Platform |
Priority Rating |
Availability |
|
|
Acrobat DC |
Continuous |
2021.007.20091 |
Windows and macOS |
2 |
|
|
Acrobat Reader DC |
Continuous |
2021.007.20091 |
Windows and macOS |
2 |
|
|
|
|
|
|
|
|
|
Acrobat 2020 |
Classic 2020 |
2020.004.30015 |
Windows and macOS |
2 |
|
|
Acrobat Reader 2020 |
Classic 2020 |
2020.004.30015 |
Windows and macOS |
2 |
|
|
|
|
|
|
|
|
|
Acrobat 2017 |
Classic 2017 |
2017.011.30202 |
Windows and macOS |
2 |
|
|
Acrobat Reader 2017 |
Classic 2017 |
2017.011.30202 |
Windows and macOS |
2 |
Vulnerability Details
| Vulnerability Category | Vulnerability Impact | Severity | CVSS base score |
CVSS vector |
CVE Number |
|---|---|---|---|---|---|
Type Confusion (CWE-843) |
Arbitrary code execution |
Critical |
7.8 |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
CVE-2021-39841 |
Heap-based Buffer Overflow (CWE-122) |
Arbitrary code execution |
Critical |
7.8 |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
CVE-2021-39863 |
Information Exposure (CWE-200) |
Arbitrary file system read |
Moderate |
6.5 |
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N |
CVE-2021-39857 CVE-2021-39856 CVE-2021-39855 |
Out-of-bounds Read (CWE-125) |
Memory leak |
Critical |
7.7 |
CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:C/C:N/I:L/A:H |
CVE-2021-39844 |
Out-of-bounds Read (CWE-125) |
Memory leak |
Important |
5.5 |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N |
CVE-2021-39861 |
Out-of-bounds Read (CWE-125) |
Arbitrary file system read |
Moderate |
3.3
|
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N |
CVE-2021-39858 |
Out-of-bounds Write (CWE-787) |
Memory leak |
Critical |
7.8 |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
CVE-2021-39843 |
Stack-based Buffer Overflow (CWE-121) |
Arbitrary code execution |
Critical |
6.1 |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H |
CVE-2021-39846 CVE-2021-39845 |
Uncontrolled Search Path Element (CWE-427) |
Arbitrary code execution |
Important |
7.3 |
CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H |
CVE-2021-35982 |
Use After Free (CWE-416) |
Arbitrary code execution |
Important |
4.4 |
CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N |
CVE-2021-39859 |
Use After Free (CWE-416) |
Arbitrary code execution |
Critical |
7.8 |
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
CVE-2021-39840 CVE-2021-39842 CVE-2021-39839 CVE-2021-39838 CVE-2021-39837 CVE-2021-39836 |
NULL Pointer Dereference (CWE-476) |
Memory leak |
Important |
5.5 |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N |
CVE-2021-39860 |
NULL Pointer Dereference (CWE-476) |
Application denial-of-service |
Important |
5.5 |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
CVE-2021-39852 |
NULL Pointer Dereference (CWE-476) |
Application denial-of-service |
Important |
5.5 |
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
CVE-2021-39854 CVE-2021-39853 CVE-2021-39850 CVE-2021-39849
|
NULL Pointer Dereference (CWE-476) |
Application denial-of-service |
Important |
5.5 |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
CVE-2021-39851 |
Use After Free (CWE-416) |
Arbitrary code execution |
Critical |
7.8 | CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
CVE-2021-40725 |
Use After Free (CWE-416) |
Arbitrary code execution |
Critical |
7.8 | CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
CVE-2021-40726 |
Acknowledgements
Adobe would like to thank the following for reporting the relevant issues and for working with Adobe to help protect our customers:
- 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, CVE-2021-40725, CVE-2021-40726)
- Haboob labs (CVE-2021-39859, CVE-2021-39860, CVE-2021-39861, CVE-2021-39843, CVE-2021-39844, CVE-2021-39845, CVE-2021-39846)
- Robert Chen (Deep Surface<https://deepsurface.com/>) (CVE-2021-35982)
- XuPeng from UCAS and Ying Lingyun form QI-ANXIN Technology Research Institute (CVE-2021-39854, CVE-2021-39853, CVE-2021-39852, CVE-2021-39851, CVE-2021-39850, CVE-2021-39849)
- j00sean (CVE-2021-39857, CVE-2021-39856, CVE-2021-39855, CVE-2021-39842)
- Exodus Intelligence (exodusintel.com) and Andrei Stefan (CVE-2021-39863)
- Qiao Li Of Baidu Security Lab working with Trend Micro Zero Day Initiative (CVE-2021-39858)
Revisions
September 20, 2021: Updated acknowledgement details for CVE-2021-35982.
September 28, 2021: Updated acknowledgement details for CVE-2021-39863.
October 5, 2021: Updated CVSS base score, CVSS vector, and Severity for CVE-2021-39852, CVE-2021-39851, CVE-2021-39863, CVE-2021-39860, CVE-2021-39861. Added data and acknowledgements for CVE-2021-40725 and CVE-2021-40726.
January 18th, 2022: Updated acknowledgement details for CVE-2021-39854, CVE-2021-39853, CVE-2021-39852, CVE-2021-39851, CVE-2021-39850, CVE-2021-39849
January 27th, 2022: Updated CVSS details for CVE-2021-39845, CVE-2021-39846, CVE-2021-39855, CVE-2021-39856, CVE-2021-39860, CVE-2021-39861
For more information, visit https://helpx.adobe.com/security.html, or email PSIRT@adobe.com.