Windows 10: Silverlight 5 Blocked

Holly ClareBeaudet · Mar 18, 2020

Silverlight 5 is necessary for me to work from home.

I cannot download it, because it states multiple times that there is a Virus.

Others have been able to do this; now I am "out in the cold".

Help, Please.

:)

Brink · Mar 18, 2020

Blocking Flash, Shockwave, Silverlight controls activating in Office

Today we are announcing an upcoming change to Office that blocks activation of Flash, Shockwave and Silverlight controls within Office.

We are taking this step based on the following factors:

Use of some these controls in exploit campaigns to target end users of Office.

Low observed use of these controls within Office.

Upcoming end of support for some these components

On July 2017, Adobe announced that Flash will no longer be supported after 2020. Major browsers including Edge, Chrome, Safari and Firefox have announced their respective roadmaps for ending support for Flash.

Silverlight is expected to reach end of support in 2021 with support for several browsers and OS platforms already ended in 2016.

Note: This change only applies to Office 365 subscription clients. It will not apply to Office 2016, Office 2013 or Office 2010.

Customers who wish to enforce this behavior now in Office 365 subscription clients or in Office 2016 perpetual and down level versions can use the guidance published here to block controls targeted by this change.

Furthermore, customers can also take advantage of the recently published Security Baseline for Office 2016 that includes a custom Group Policy that blocks Flash.

What does this update block?

This change blocks the activation of the following controls within the Office process.

[table][tr][td]Control[/td] [td]CLSID[/td] [/tr] [tr][td]Flash[/td] [td]D27CDB6E-AE6D-11CF-96B8-444553540000 D27CDB70-AE6D-11CF-96B8-444553540000[/td] [/tr] [tr][td]Shockwave[/td] [td]233C1507-6A77-46A4-9443-F871F945D258[/td] [/tr] [tr][td]Silverlight[/td] [td]DFEAF541-F3E1-4c24-ACAC-99C30715084A[/td] [/tr] [/table]

Some examples of scenarios that would be impacted by this change are:

Controls directly embedded in an Office document, for example, Flash video directly embedded within a PowerPoint document using the Insert Object functionality

Controls invoked by extensibility components within the Office process, for example, Power View add-in that uses Silverlight

Note: this change does not cover scenarios where these controls are activated outside the Office process, for example, a Flash video inserted into a document via the Insert Online Video functionality.

When would this block take effect?

This change only applies to Office 365 subscription clients and is targeted to take effect in the following order

Controls are blocked in Office 365 Monthly Channel starting in June 2018.

Controls are blocked in Office 365 Semi Annual Targeted (SAT) Channel starting in September 2018.

Controls are blocked in Office 365 Semi Annual (SA) Channel starting in January 2019.

Can I unblock these controls if I need to?

Yes. While we are confident that this will not impact most Office users, we do understand there is potential to impact some of our users and we apologize for the inconvenience caused as a result.

Please refer to support guidance published here if you need to unblock controls critical to your workflow.

In closing, we believe this is another step forward in elevating the security of Office. One that protects our users from malicious attacks without disrupting day to day productivity for most of them.
Click to expand...

Source: Blocking Flash, Shockwave, Silverlight controls from activating in Office Applications for Security - Microsoft Tech Community - 191729

Brink · Mar 18, 2020

Blocking Flash, Shockwave, Silverlight controls activating in Office Office

Today we are announcing an upcoming change to Office that blocks activation of Flash, Shockwave and Silverlight controls within Office.

We are taking this step based on the following factors:

Use of some these controls in exploit campaigns to target end users of Office.

Low observed use of these controls within Office.

Upcoming end of support for some these components

On July 2017, Adobe announced that Flash will no longer be supported after 2020. Major browsers including Edge, Chrome, Safari and Firefox have announced their respective roadmaps for ending support for Flash.

Silverlight is expected to reach end of support in 2021 with support for several browsers and OS platforms already ended in 2016.

Note: This change only applies to Office 365 subscription clients. It will not apply to Office 2016, Office 2013 or Office 2010.

Customers who wish to enforce this behavior now in Office 365 subscription clients or in Office 2016 perpetual and down level versions can use the guidance published here to block controls targeted by this change.

Furthermore, customers can also take advantage of the recently published Security Baseline for Office 2016 that includes a custom Group Policy that blocks Flash.

What does this update block?

This change blocks the activation of the following controls within the Office process.

[table][tr][td]Control[/td] [td]CLSID[/td] [/tr] [tr][td]Flash[/td] [td]D27CDB6E-AE6D-11CF-96B8-444553540000 D27CDB70-AE6D-11CF-96B8-444553540000[/td] [/tr] [tr][td]Shockwave[/td] [td]233C1507-6A77-46A4-9443-F871F945D258[/td] [/tr] [tr][td]Silverlight[/td] [td]DFEAF541-F3E1-4c24-ACAC-99C30715084A[/td] [/tr] [/table]

Some examples of scenarios that would be impacted by this change are:

Controls directly embedded in an Office document, for example, Flash video directly embedded within a PowerPoint document using the Insert Object functionality

Controls invoked by extensibility components within the Office process, for example, Power View add-in that uses Silverlight

Note: this change does not cover scenarios where these controls are activated outside the Office process, for example, a Flash video inserted into a document via the Insert Online Video functionality.

When would this block take effect?

This change only applies to Office 365 subscription clients and is targeted to take effect in the following order

Controls are blocked in Office 365 Monthly Channel starting in June 2018.

Controls are blocked in Office 365 Semi Annual Targeted (SAT) Channel starting in September 2018.

Controls are blocked in Office 365 Semi Annual (SA) Channel starting in January 2019.

Can I unblock these controls if I need to?

Yes. While we are confident that this will not impact most Office users, we do understand there is potential to impact some of our users and we apologize for the inconvenience caused as a result.

Please refer to support guidance published here if you need to unblock controls critical to your workflow.

In closing, we believe this is another step forward in elevating the security of Office. One that protects our users from malicious attacks without disrupting day to day productivity for most of them.
Click to expand...

Source: Blocking Flash, Shockwave, Silverlight controls from activating in Office Applications for Security - Microsoft Tech Community - 191729

qubit · Mar 18, 2020

Silverlight 5 Available for Download

Today, we’re happy to announce the release of Silverlight 5. Silverlight is part of a rich offering of technologies from Microsoft helping developers deliver applications for the web, desktop and mobile devices. Download Silverlight 5, a free plug-in less than 7 MB in size that can be installed in less than 10 seconds.

New features in Silverlight 5 include Hardware Decode of H.264 media, which provides a significant performance improvement with decoding of unprotected content using the GPU; Postscript Vector Printing to improve output quality and file size; and an improved graphics stack with 3D support that uses the XNA API on the Windows platform to gain low-level access to the GPU for drawing vertex shaders and low-level 3D primitives.

In addition, Silverlight 5 extends the ‘Trusted Application’ model to the browser for the first time. These features, when enabled via a group policy registry key and an application certificate, mean users won’t need to leave the browser to perform complex tasks such as multiple window support, full trust support in browser including COM and file system access, in browser HTML hosting within Silverlight, and P/Invoke support for existing native code to be run directly from Silverlight.

For more information, visit the Microsoft Silverlight site. For additional information on support policy, visit Microsoft Silverlight Support Lifecycle Policy.

The Silverlight Team

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Blocking Flash, Shockwave, Silverlight controls activating in Office