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CyberSecurity Asean security alert on Multiple Vulnerabilities in Adobe Acrobat and Reader Could Allow for Arbitrary Code Execution

This alert is originally published and can be viewed at https://www.cisecurity.org

OVERVIEW:
Multiple vulnerabilities have been discovered in Adobe Acrobat and Adobe Reader, the most severe of which could allow for arbitrary code execution. Adobe Acrobat and Reader allow a user to view, create, manipulate, print and manage files in Portable Document Format (PDF). Successful exploitation of the most severe of these vulnerabilities could result in the attacker gaining control of the affected system. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. If this application has been configured to have fewer user rights on the system, exploitation of the most severe of these vulnerabilities could have less impact than if it was configured with administrative rights. 
 
THREAT INTELLIGENCE:
There are no reports of these vulnerabilities being exploited in the wild.
 
SYSTEMS AFFECTED:

  • Acrobat DC (Continuous track) for Windows & macOS version 2019.021.20061 and earlier versions

  • Acrobat Reader DC (Continuous track) for Windows & macOS version 2019.021.20061 and earlier versions

  • Acrobat 2017 (Classic 2017 track) for Windows version 2017.011.30156 and earlier versions

  • Acrobat Reader 2017 (Classic 2017 track) for macOS version 2017.011.30156 and earlier versions

  • Acrobat 2015 (Classic 2015 track) for Windows & macOS version 2015.006.30508 and earlier versions

  • Acrobat Reader 2015 (Classic 2015 track) for Windows & macOS version 2015.006.30508 and earlier versions

 
RISK:
Government:

  • Large and medium government entities: High

  • Small government entities: Medium

Businesses:

  • Large and medium business entities: High

  • Small business entities: Medium

Home users: Low
 
TECHNICAL SUMMARY:
Multiple vulnerabilities have been discovered in Adobe Acrobat and Adobe Reader, the most severe of which could allow for arbitrary code execution. The vulnerabilities are as follows:
 

  • Multiple Out-of-Bounds Read vulnerabilities that could allow for Information Disclosure. (CVE-2020-3744, CVE-2020-3747, CVE-2020-3755)

  • A Heap Overflow vulnerability that could allow for Arbitrary Code Execution. (CVE-2020-3742)

  • Multiple Buffer Error vulnerabilities that could allow for Arbitrary Code Execution. (CVE-2020-3752, CVE-2020-3754)

  • Multiple Use After Free vulnerabilities that could allow for Arbitrary Code Execution. (CVE-2020-3743, CVE-2020-3745, CVE-2020-3746, CVE-2020-3748, CVE-2020-3749, CVE-2020-3750, CVE-2020-3751)

  • Multiple Stack exhaustion vulnerabilities that could allow for Memory Leak. (CVE-2020-3753, CVE-2020-3756)

  • Multiple Privilege Escalation vulnerabilities that could allow for Arbitrary file system write. (CVE-2020-3762, CVE-2020-3763)

 
Successful exploitation of the most severe of these vulnerabilities could result in the attacker gaining control of the affected system. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. If this application has been configured to have fewer user rights on the system, exploitation of the most severe of these vulnerabilities could have less impact than if it was configured with administrative rights.
 
RECOMMENDATIONS:
We recommend the following actions be taken:

  • Install the updates provided by Adobe immediately after appropriate testing.

  • Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.

  • Remind users not to visit websites or follow links provided by unknown or untrusted sources.

  • Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from un-trusted sources.

  • Apply the Principle of Least Privilege to all systems and services.

 
REFERENCES:
https://helpx.adobe.com/security/products/acrobat/apsb20-05.html
 
CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3742
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3743
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3744
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3745
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3746  
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3747
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3748
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3749
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3750
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3751    
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3752
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3753
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3754
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3755
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3756
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3762  
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3763

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