Endpoint Vulnerability

Microsoft Word Security Feature Bypass Vulnerability


A security feature bypass vulnerability exists in Microsoft Word software when it fails to properly handle .LNK files. An attacker who successfully exploited the vulnerability could use a specially crafted file to perform actions in the security context of the current user. For example, the file could then take actions on behalf of the logged-on user with the same permissions as the current user. To exploit the vulnerability, a user must open a specially crafted file with an affected version of Microsoft Word software. In an email attack scenario, an attacker could exploit the vulnerability by sending the specially crafted file to the user and convincing the user to open the file. In a web-based attack scenario, an attacker could host a website (or leverage a compromised website that accepts or hosts user-provided content) that contains a specially crafted file that is designed to exploit the vulnerability. However, an attacker would have no way to force the user to visit the website. Instead, an attacker would have to convince the user to click a link, typically by way of an enticement in an email or Instant Messenger message, and then convince the user to open the specially crafted file. The security update addresses the vulnerability by correcting how Microsoft Word handles these files.

Affected Products

Microsoft Office 2019 for 32-bit editions,Microsoft Word 2013 Service Pack 1 (32-bit editions),Microsoft Office 2016 for Mac,Microsoft 365 Apps for Enterprise for 64-bit Systems,Microsoft Office 2019 for 64-bit editions,Microsoft Word 2013 RT Service Pack 1,Microsoft Office 2019 for Mac,Microsoft 365 Apps for Enterprise for 32-bit Systems,Microsoft Word 2016 x86,Microsoft Word 2010 Service Pack 2 (32-bit editions)