ADV180005 — Document signing deprecation in XPS Viewer

Executive Summary

Microsoft has deprecated the Document Signing functionality in XPS Viewer. This functionality relied upon the SHA-1 algorithm and is part of our overall effort to remove this algorithm from our products. This change impacts XPS Viewer on all supported versions of Windows. 1. I need to use this deprecated functionality. Is there a way to enable it? Yes. Please create the following registry entry: [HKEY_CURRENT_USER\Software\Microsoft\XPSViewer] "EnableDigitalSignatures"=dword:00000001 2. What risks am I accepting by using SHA-1 based document signing? SHA-1 is a legacy cryptographic hash that many in the security community believe is no longer secure. Using the SHA-1 hashing algorithm in document signing could allow an attacker to spoof content, perform phishing attacks, or otherwise manipulate content of a document. Microsoft, in collaboration with other members of the industry, is working to phase out the SHA-1 algorithm and to warn consumers of the possible risk when they encounter websites using the SHA-1 algorithm.

Overview

Unknown

MS Severity

Not Exploited

MS Exploit Status

Exploitation Unlikely

MS Exploit Likelihood

Category Defense in Depth

Released Feb 13 2018

Last Updated Feb 13 2018

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score

No EPSS score available for this CVE.

View on FIRST.org

Affected Products

14 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 for 32-bit Systems	`4074596 (Security Update)`	Unknown	Defense in Depth	Yes
Windows 10 for x64-based Systems	`4074596 (Security Update)`	Unknown	Defense in Depth	Yes
Windows 10 Version 1511 for 32-bit Systems	`4074591 (Security Update)`	Unknown	Defense in Depth	Yes
Windows 10 Version 1511 for x64-based Systems	`4074591 (Security Update)`	Unknown	Defense in Depth	Yes
Windows 10 Version 1607 for 32-bit Systems	`4074590 (Security Update)`	Unknown	Defense in Depth	Yes
Windows 10 Version 1607 for x64-based Systems	`4074590 (Security Update)`	Unknown	Defense in Depth	Yes
Windows 10 Version 1703 for 32-bit Systems	`4074592 (Security Update)`	Unknown	Defense in Depth	Yes
Windows 10 Version 1703 for x64-based Systems	`4074592 (Security Update)`	Unknown	Defense in Depth	Yes
Windows 10 Version 1709 for 32-bit Systems	`4074588 (Security Update)`	Unknown	Defense in Depth	Yes
Windows 10 Version 1709 for x64-based Systems	`4074588 (Security Update)`	Unknown	Defense in Depth	Yes
Windows 7 for 32-bit Systems Service Pack 1 4074598 (Monthly Rollup) 4074587 (Security Only) Unknown Defense in Depth 4056894 Base: N/A Temporal: N/A Vector: N/A Yes None Windows 7 for x64-based Systems Service Pack 1 4074598 (Monthly Rollup) 4074587 (Security Only) Unknown Defense in Depth 4056894 Base: N/A Temporal: N/A Vector: N/A Yes None Windows 8.1 for 32-bit systems 4074594 (Monthly Rollup) 4074597 (Security Only) Unknown Defense in Depth 4056895 Base: N/A Temporal: N/A Vector: N/A Yes None Windows 8.1 for x64-based systems 4074594 (Monthly Rollup) 4074597 (Security Only) Unknown Defense in Depth 4056895 Base: N/A Temporal: N/A Vector: N/A Yes None Windows RT 8.1	`4074594 (Monthly Rollup)`	Unknown	Defense in Depth	Yes
Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 4074598 (Monthly Rollup) 4074587 (Security Only) Unknown Defense in Depth 4056894 Base: N/A Temporal: N/A Vector: N/A Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 4074598 (Monthly Rollup) 4074587 (Security Only) Unknown Defense in Depth 4056894 Base: N/A Temporal: N/A Vector: N/A Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4074598 (Monthly Rollup) 4074587 (Security Only) Unknown Defense in Depth 4056894 Base: N/A Temporal: N/A Vector: N/A Yes None Windows Server 2012 4074593 (Monthly Rollup) 4074589 (Security Only) Unknown Defense in Depth 4056896 Base: N/A Temporal: N/A Vector: N/A Yes None Windows Server 2012 (Server Core installation) 4074593 (Monthly Rollup) 4074589 (Security Only) Unknown Defense in Depth 4056896 Base: N/A Temporal: N/A Vector: N/A Yes None Windows Server 2012 R2 4074594 (Monthly Rollup) 4074597 (Security Only) Unknown Defense in Depth 4056895 Base: N/A Temporal: N/A Vector: N/A Yes None Windows Server 2012 R2 (Server Core installation) 4074594 (Monthly Rollup) 4074597 (Security Only) Unknown Defense in Depth 4056895 Base: N/A Temporal: N/A Vector: N/A Yes None Windows Server 2016	`4074590 (Security Update)`	Unknown	Defense in Depth	Yes
Windows Server 2016 (Server Core installation)	`4074590 (Security Update)`	Unknown	Defense in Depth	Yes
Windows Server, version 1709 (Server Core Installation)	`4074588 (Security Update)`	Unknown	Defense in Depth	Yes

Patches

6 patches

Article	Type	Restart
`4074596`	Security Update	Yes
`4074591`	Security Update	Yes
`4074590`	Security Update	Yes
`4074592`	Security Update	Yes
`4074588`	Security Update	Yes
`4074594`	Monthly Rollup	Yes

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

None

References

MSRC Advisory MITRE NVD