Security Vulnerability

Published: 09/23/2019 | Last Updated : 10/03/2019

MITRE CVE-2019-1367

A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer. 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. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

In a web-based attack scenario, an attacker could 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.

The security update addresses the vulnerability by modifying how the scripting engine handles objects in memory.

Exploitability Assessment

The following table provides an exploitability assessment for this vulnerability at the time of original publication.

Publicly Disclosed	Exploited	Latest Software Release	Older Software Release	Denial of Service
No	Yes	0 - Exploitation Detected	0 - Exploitation Detected	Not Applicable

Security Updates

To determine the support life cycle for your software version or edition, see the Microsoft Support Lifecycle.

Product	Platform	Article	Download	Impact	Severity	Supersedence
Internet Explorer 10	Windows Server 2012	4524154	Monthly Rollup	Remote Code Execution	Moderate	4516055
4524135	IE Cumulative
Internet Explorer 11	Windows 10 Version 1703 for 32-bit Systems	4524151	Security Update	Remote Code Execution	Critical	4522011
Internet Explorer 11	Windows 10 Version 1703 for x64-based Systems	4524151	Security Update	Remote Code Execution	Critical	4522011
Internet Explorer 11	Windows 10 Version 1803 for 32-bit Systems	4524149	Security Update	Remote Code Execution	Critical	4522014
Internet Explorer 11	Windows 10 Version 1803 for x64-based Systems	4524149	Security Update	Remote Code Execution	Critical	4522014
Internet Explorer 11	Windows 10 Version 1803 for ARM64-based Systems	4524149	Security Update	Remote Code Execution	Critical	4522014
Internet Explorer 11	Windows 10 Version 1809 for 32-bit Systems	4524148	Security Update	Remote Code Execution	Critical	4522015
Internet Explorer 11	Windows 10 Version 1809 for x64-based Systems	4524148	Security Update	Remote Code Execution	Critical	4522015
Internet Explorer 11	Windows 10 Version 1809 for ARM64-based Systems	4524148	Security Update	Remote Code Execution	Critical	4522015
Internet Explorer 11	Windows Server 2019	4524148	Security Update	Remote Code Execution	Moderate	4522015
Internet Explorer 11	Windows 10 Version 1709 for 32-bit Systems	4524150	Security Update	Remote Code Execution	Critical	4522012
Internet Explorer 11	Windows 10 Version 1709 for 64-based Systems	4524150	Security Update	Remote Code Execution	Critical	4522012
Internet Explorer 11	Windows 10 Version 1709 for ARM64-based Systems	4524150	Security Update	Remote Code Execution	Critical	4522012
Internet Explorer 11	Windows 10 Version 1903 for 32-bit Systems	4524147	Security Update	Remote Code Execution	Critical	4522016
Internet Explorer 11	Windows 10 Version 1903 for x64-based Systems	4524147	Security Update	Remote Code Execution	Critical	4522016
Internet Explorer 11	Windows 10 Version 1903 for ARM64-based Systems	4524147	Security Update	Remote Code Execution	Critical	4522016
Internet Explorer 11	Windows 10 for 32-bit Systems	4524153	Security Update	Remote Code Execution	Critical	4522009
Internet Explorer 11	Windows 10 for x64-based Systems	4524153	Security Update	Remote Code Execution	Critical	4522009
Internet Explorer 11	Windows 10 Version 1607 for 32-bit Systems	4524152	Security Update	Remote Code Execution	Critical	4522010
Internet Explorer 11	Windows 10 Version 1607 for x64-based Systems	4524152	Security Update	Remote Code Execution	Critical	4522010
Internet Explorer 11	Windows Server 2016	4524152	Security Update	Remote Code Execution	Moderate	4522010
Internet Explorer 11	Windows 7 for 32-bit Systems Service Pack 1	4524157	Monthly Rollup	Remote Code Execution	Critical	4516065
4524135	IE Cumulative
Internet Explorer 11	Windows 7 for x64-based Systems Service Pack 1	4524157	Monthly Rollup	Remote Code Execution	Critical	4516065
4524135	IE Cumulative
Internet Explorer 11	Windows 8.1 for 32-bit systems	4524156	Monthly Rollup	Remote Code Execution	Critical	4516067
4524135	IE Cumulative
Internet Explorer 11	Windows 8.1 for x64-based systems	4524156	Monthly Rollup	Remote Code Execution	Critical	4516067
4524135	IE Cumulative
Internet Explorer 11	Windows Server 2008 R2 for x64-based Systems Service Pack 1	4524157	Monthly Rollup	Remote Code Execution	Moderate	4516065
4524135	IE Cumulative
Internet Explorer 11	Windows Server 2012	4524135	IE Cumulative	Remote Code Execution	Moderate	4522007
Internet Explorer 11	Windows Server 2012 R2	4524156	Monthly Rollup	Remote Code Execution	Moderate	4516067
4524135	IE Cumulative
Internet Explorer 9	Windows Server 2008 for 32-bit Systems Service Pack 2	4524135	IE Cumulative	Remote Code Execution	Moderate	4522007
Internet Explorer 9	Windows Server 2008 for x64-based Systems Service Pack 2	4524135	IE Cumulative	Remote Code Execution	Moderate	4522007

Mitigations

By default, Internet Explorer on Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016 and Windows Server 2019 runs in a restricted mode that is known as Enhanced Security Configuration. Enhanced Security Configuration is a group of preconfigured settings in Internet Explorer that can reduce the likelihood of a user or administrator downloading and running specially crafted web content on a server. This is a mitigating factor for websites that you have not added to the Internet Explorer Trusted sites zone.

Workarounds

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

Impact of Workaround

Implementing these steps might result in reduced functionality for components or features that rely on jscript.dll. To be fully protected, Microsoft recommends the update be installed as soon as possible. Please revert the mitigation steps before installing the update to return to a full state.

By default, IE11, IE10, and IE9 uses Jscript9.dll which is not impacted by this vulnerability. This vulnerability only affects certain websites that utilize jscript as the scripting engine.

How to undo the workaround

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

cacls %windir%\system32\jscript.dll /E /R everyone

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

cacls %windir%\system32\jscript.dll /E /R everyone
cacls %windir%\syswow64\jscript.dll /E /R everyone


FAQ

Will an updated Windows Update offline scan file, Wsusscn2.cab, with this new security update be available?
Yes. An updates scan file will be available at the time of, or shortly after, the release.

I am running Internet Explorer 9 on Windows Server 2008. Is there a Monthly Rollup available?
No. The IE Cumulative update for Windows Server 2008 contains all of the fixes needed to address this vulnerability and the known printer issue. As such, we are making the IECU available via Windows Update, in addition to WSUS and Microsoft Update, for customers running Windows Server 2008.

Acknowledgements

Clément Lecigne of Google’s Threat Analysis Group

See acknowledgements for more information.

Disclaimer

The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

Revisions

Version	Date	Description
1.0	09/23/2019	Information published.
2.0	10/03/2019	To address a known printing issue customers might experience after installing the Security Updates or IE Cumulative updates that were released on September 23, 2019 for CVE-2019-1367, Microsoft is releasing new Security Updates, IE Cumulative Updates, and Monthly Rollup updates for all applicable installations of Internet Explorer 9, 10, or 11 on Microsoft Windows. Please see the Security Updates table for CVE-2019-1367 for the new updates. Note that these updates are available automatically via Windows Update, WSUS, or manually from the Microsoft Update Catalog. This release is separate from the October Update Tuesday release, which is scheduled for October 8, 2019.

Source: https://portal.msrc.microsoft.com/en.../CVE-2019-1367

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Posted By: Brink
23 Sep 2019