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Multiple Vulnerabilities in Adobe Acrobat and Reader Could Allow for Arbitrary Code Execution (APSB20-13)

MS-ISAC ADVISORY NUMBER:

2020-038

DATE(S) ISSUED:

03/17/2020

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 application, 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 2020.006.20034 and earlier versions
  • Acrobat 2017 (Classic 2017 track) for Windows version 2017.011.30158 and earlier versions
  • Acrobat Reader 2017 (Classic 2017 track) for macOS version 2017.011.30158 and earlier versions
  • Acrobat 2015 (Classic 2015 track) for Windows & macOS version 2015.006.30510 and earlier versions
  • Acrobat Reader 2015 (Classic 2015 track) for Windows & macOS version 2015.006.30510 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-2020-3804, CVE-2020-3806)
  • Out-of-bounds write vulnerability that could allow for Arbitrary Code Execution. (CVE-2020-3795)
  • Stack-based buffer overflow vulnerability that could allow for Arbitrary Code Execution. (CVE-2020-3799)
  • Multiple Use-after-free vulnerabilities that could allow for Arbitrary Code Execution. (CVE-2020-3792, CVE-2020-3793, CVE-2020-3801, CVE-2020-3802, CVE-2020-3805)
  • Memory address leak vulnerability that could allow for Information Disclosure. (CVE-2020-3800)
  • Buffer overflow vulnerability that could allow for Arbitrary Code Execution. (CVE-2020-3807)
  • Memory corruption vulnerability that could allow for Arbitrary Code Execution. (CVE-2020-3797)
  • Insecure library loading (DLL hijacking) vulnerability that could allow for Privilege Escalation. (CVE-2020-3803)

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 application, 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:

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Pencil Media mention 20 May 2020