Microsoft Internet Explorer – Scripting Engine Memory Corruption Vulnerability

About

Microsoft Internet Explorer contains a scripting engine, which handles execution of scripting languages such as VBScript and JScript. JScript component contains an unspecified Scripting Engine Memory Corruption vulnerability, which results in remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer.

Microsoft Internet Explorer - Scripting Engine Memory Corruption Vulnerability

Impact

The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system.

What Attacker can do ?

An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

Web-based remote execution ?

Yes possible, an attacker can host a specially crafted website that is designed to exploit the vulnerability through Internet Explorer and then convince a user to view the website, for example, by sending an email.

Is there an update to address this vulnerability ?

No, Microsoft is aware of this vulnerability and working on a fix. Our standard policy is to release security updates on Update Tuesday, the second Tuesday of each month. This predictable schedule allows for partner quality assurance and IT planning, which helps maintain the Windows ecosystem as a reliable, secure choice for our customers.

Is Microsoft aware of attacks based on this vulnerability ?

Yes, Microsoft is aware of limited targeted attacks.

Is there a CVE assigned to this vulnerability?

Yes, Microsoft has assigned CVE-2020-0674 to this vulnerability

Mitigations

Restrict access to JScript.dll

For 32-bit systems, enter the following command at an administrative command prompt:

    takeown /f %windir%\system32\jscript.dll
    cacls %windir%\system32\jscript.dll /E /P everyone:N

For 64-bit systems, enter the following command at an administrative command prompt:

    takeown /f %windir%\syswow64\jscript.dll
    cacls %windir%\syswow64\jscript.dll /E /P everyone:N
    takeown /f %windir%\system32\jscript.dll
    cacls %windir%\system32\jscript.dll /E /P everyone:N

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