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CVE-2021-28561: Adobe Security Bulletin

Acrobat Reader DC versions versions 2021.001.20150 (and earlier), 2020.001.30020 (and earlier) and 2017.011.30194 (and earlier) are affected by a memory corruption vulnerability. An unauthenticated attacker could leverage this vulnerability to achieve arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

CVE
#vulnerability#mac#windows#apple#cisco#buffer_overflow#auth#ssh

Security update available for Adobe Acrobat and Reader | APSB21-29

Bulletin ID

Date Published

Priority

APSB21-29

May 11, 2021

1

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.

Adobe has received a report that CVE-2021-28550 has been exploited in the wild in limited attacks targeting Adobe Reader users on Windows.

Affected Versions

Product

Track

Affected Versions

Platform

Acrobat DC

Continuous

2021.001.20150 and earlier versions

Windows

Acrobat Reader DC

Continuous

2021.001.20150 and earlier versions

Windows

Acrobat DC

Continuous

2021.001.20149 and earlier

versions

macOS

Acrobat Reader DC

Continuous

2021.001.20149 and earlier

versions

macOS

Acrobat 2020

Classic 2020

2020.001.30020 and earlier versions

Windows & macOS

Acrobat Reader 2020

Classic 2020

2020.001.30020 and earlier versions

Windows & macOS

Acrobat 2017

Classic 2017

2017.011.30194  and earlier versions

Windows & macOS

Acrobat Reader 2017

Classic 2017

2017.011.30194  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:

Product

Track

Updated Versions

Platform

Priority Rating

Availability

Acrobat DC

Continuous

2021.001.20155

Windows and macOS

1

Release Notes

Acrobat Reader DC

Continuous

2021.001.20155

Windows and macOS

1

Release Notes

Acrobat 2020

Classic 2020

2020.001.30025

Windows and macOS

1

Release Notes

Acrobat Reader 2020

Classic 2020

2020.001.30025

Windows and macOS

1

Release Notes

Acrobat 2017

Classic 2017

2017.011.30196

Windows and macOS

1

Release Notes

Acrobat Reader 2017

Classic 2017

2017.011.30196

Windows and macOS

1

Release Notes

Vulnerability Details

Vulnerability Category

Vulnerability Impact

Severity

CVE Number

Out-of-bounds Write

Arbitrary code execution

Important

CVE-2021-28561

Heap-based Buffer Overflow

Arbitrary code execution

Critical

CVE-2021-28560

Heap-based Buffer Overflow

Arbitrary code execution

Important

CVE-2021-28558

Out-of-bounds Read

Memory leak

Critical

CVE-2021-28557

Out-of-bounds Read

Arbitrary file system read

Important

CVE-2021-28555

Out-of-bounds Read

Arbitrary code execution

Critical

CVE-2021-28565

Out-of-bounds Write

Arbitrary code execution

Critical

CVE-2021-28564

Out-of-bounds Write

Arbitrary code execution

Critical

CVE-2021-21044

CVE-2021-21038

Exposure of Private Information

Privilege escalation

Important

CVE-2021-28559

Use After Free

Arbitrary code execution

Critical

CVE-2021-28562

CVE-2021-28550

CVE-2021-28553

Acknowledgements

Adobe would like to thank the following for reporting the relevant issues and for working with Adobe to help protect our customers.

  • Anonymously reported (CVE-2021-28550)
  • Aleksandar Nikolic of Cisco Talos. (CVE-2021-28562)
  • Xu peng (xupeng_1231) (CVE-2021-28561)
  • chutchut (CVE-2021-28559)
  • fr0zenrain of Baidu Security (CVE-2021-28560)
  • Haboob Labs (CVE-2021-28557, CVE-2021-28564, CVE-2021-28565, CVE-2021-28553, , CVE-2021-28558, CVE-2021-28555)

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