Microsoft Windows VBScript CVE-2019-0794 Remote Code Execution Vulnerability

Description

Microsoft Windows VBScript is prone to a remote code-execution vulnerability. An attacker can exploit this issue to execute arbitrary code in the context of the user running the affected application. Failed exploit attempts will likely result in denial-of-service conditions.

Technologies Affected

• Microsoft Windows 10 Version 1607 for 32-bit Systems
• Microsoft Windows 10 Version 1607 for x64-based Systems
• Microsoft Windows 10 Version 1709 for ARM64-based Systems
• Microsoft Windows 10 Version 1803 for 32-bit Systems
• Microsoft Windows 10 Version 1803 for ARM64-based Systems
• Microsoft Windows 10 Version 1803 for x64-based Systems
• Microsoft Windows 10 Version 1809 for 32-bit Systems
• Microsoft Windows 10 Version 1809 for ARM64-based Systems
• Microsoft Windows 10 Version 1809 for x64-based Systems
• Microsoft Windows 10 for 32-bit Systems
• Microsoft Windows 10 for x64-based Systems
• Microsoft Windows 10 version 1703 for 32-bit Systems
• Microsoft Windows 10 version 1703 for x64-based Systems
• Microsoft Windows 10 version 1709 for 32-bit Systems
• Microsoft Windows 10 version 1709 for x64-based Systems
• Microsoft Windows 7 for 32-bit Systems SP1
• Microsoft Windows 7 for x64-based Systems SP1
• Microsoft Windows 8.1 for 32-bit Systems
• Microsoft Windows 8.1 for x64-based Systems
• Microsoft Windows RT 8.1
• Microsoft Windows Server 1709
• Microsoft Windows Server 1803
• Microsoft Windows Server 2008 R2 for Itanium-based Systems SP1
• Microsoft Windows Server 2008 R2 for x64-based Systems SP1
• Microsoft Windows Server 2008 for 32-bit Systems SP2
• Microsoft Windows Server 2008 for Itanium-based Systems SP2
• Microsoft Windows Server 2008 for x64-based Systems SP2
• Microsoft Windows Server 2012
• Microsoft Windows Server 2012 R2
• Microsoft Windows Server 2016
• Microsoft Windows Server 2019

Recommendations

Run all software as a nonprivileged user with minimal access rights.
To limit the potential damage that successful exploits may achieve, run all nonadministrative software as an unprivileged user.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This may indicate exploit attempts or activity that results from successful exploits.

Do not follow links provided by unknown or untrusted sources.
Attackers can exploit this vulnerability by enticing a user to visit a malicious website. Do not follow links provided by sources of questionable integrity. Filtering HTML from emails may help remove a possible vector for transmitting malicious links to users.

Set web browser security to disable the execution of JavaScript.
Since exploiting this issue allows malicious script code to run in web clients, consider disabling support for script code and active content within the client browser. Note that this mitigation tactic might adversely affect websites that rely on the execution of browser-based script code.

Do not open email messages from unknown or untrusted individuals.
Attackers could exploit this vulnerability through HTML email messages. Do not accept any email from sources of questionable integrity.

Updates are available. Please see the references or vendor advisory for more information.