CVE-2020-16933: Microsoft Word Security Feature Bypass Vulnerability

Overview

Severity
High (CVSS 7)
CVSS Vector
CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
Category
Security Feature Bypass
Exploit Status
Not Exploited
Exploitation Likelihood
Less Likely
Patch Tuesday
2020-Oct
Released
2020-10-13
EPSS Score
4.40% (percentile: 89.0%)

Description

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.

FAQ

Is the Preview Pane an attack vector for this vulnerability? No, the Preview Pane is not an attack vector. I have Microsoft Office 2010 installed. Why am I not being offered the 4486701 update? The 4486701 update only applies to systems running specific configurations of Microsoft Office 2010. Some configurations will not be offered the update.

Affected Products (13)

Other

  • 11573
  • 11574
  • 11575
  • 11762
  • 11763
  • 10746
  • 10747
  • 10734
  • 10513
  • 10514
  • 10606
  • 10604
  • 10605

Security Updates (4)

Acknowledgments

<a href="https://twitter.com/gabriele_pippi/">Gabriele Pippi from Certego IRT</a>

Revision History

  • 2020-10-13: Information published.