Multiple Vulnerabilities in Adobe Flash Player Could Allow for Arbitrary Code Execution (APSB18-42)

ITS Advisory Number: 
2018-123
Date(s) Issued: 
Thursday, December 6, 2018
Subject: 
Multiple Vulnerabilities in Adobe Flash Player Could Allow for Arbitrary Code Execution (APSB18-42)
Overview: 

Multiple vulnerabilities have been discovered in Adobe Flash Player, the most severe of which could allow for arbitrary code execution. Adobe Flash Player is a widely distributed multimedia and application player used to enhance the user experience when visiting web pages or reading email messages. 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 this 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 this vulnerability could have less impact than if it was configured with administrative rights.

THREAT INTELLIGENCE:

Proof of concept exploit code for CVE-2018-15982 was released on GitHub on December 5th.

Systems Affected: 
  • Adobe Flash Player Desktop Runtime for Windows, Macintosh, and Linux versions 31.0.0.153 and earlier
  • Adobe Flash Player for Google Chrome versions 31.0.0.153 and earlier
  • Adobe Flash Player for Microsoft Edge and Internet Explorer 11 versions 31.0.0.153 and earlier
  • Adobe Flash Player Installer versions 31.0.0.108 and earlier
RISK
GOVERNMENT
Large and medium government entities: 
High
Small government entities: 
Medium
BUSINESS
Large and medium business entities: 
High
Small business entities: 
Medium
Home Users: 
Low
Description: 

Multiple vulnerabilities have been discovered in Adobe Flash Player, the most severe of which could allow for arbitrary code execution. The details of these vulnerabilities are as follows:

  • A use-after-free vulnerability that could lead to arbitrary code-execution (CVE-2018-15982)
  • An insecure library loading (DLL hijacking) vulnerability that could lead to privilege escalation (CVE-2018-15983)

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 this 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 this vulnerability could have less impact than if it was configured with administrative rights.

Actions: 
  • After appropriate testing, immediately apply the update provided by Adobe to vulnerable systems.
  • Enable click-to-play to require user interaction before enabling SWF content for Internet Explorer 7 and below.
  • Enable read-only protected view for Microsoft Office.
  • 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.