CVE-2021-1648: Microsoft splwow64 Elevation of Privilege Vulnerability

Overview

Severity
High (CVSS 7.8)
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
Category
Elevation of Privilege
Exploit Status
Not Exploited
Exploitation Likelihood
Less Likely
Publicly Disclosed
Yes
Patch Tuesday
2021-Jan
Released
2021-01-12
EPSS Score
0.60% (percentile: 69.6%)

FAQ

What type of information could be disclosed by this vulnerability? While this issue is labeled as an elevation of privilege, it can also be exploited to disclose information. The type of information that could be disclosed if an attacker successfully exploited this vulnerability is uninitialized memory. This CVE is marked as Publicly Disclosed. In what way was it made public? This issue has been publicly disclosed by Google Project Zero (PZ2096) and the Zero Day Initiative (ZDI-CAN-11349 through 11351).

Affected Products (32)

Windows

  • Windows 10 Version 1803 for 32-bit Systems
  • Windows 10 Version 1803 for x64-based Systems
  • Windows 10 Version 1803 for ARM64-based Systems
  • Windows 10 Version 1809 for 32-bit Systems
  • Windows 10 Version 1809 for x64-based Systems
  • Windows 10 Version 1809 for ARM64-based Systems
  • Windows Server 2019
  • Windows Server 2019 (Server Core installation)
  • Windows 10 Version 1909 for 32-bit Systems
  • Windows 10 Version 1909 for x64-based Systems
  • Windows 10 Version 1909 for ARM64-based Systems
  • Windows Server, version 1909 (Server Core installation)
  • Windows 10 Version 2004 for 32-bit Systems
  • Windows 10 Version 2004 for ARM64-based Systems
  • Windows 10 Version 2004 for x64-based Systems
  • Windows Server, version 2004 (Server Core installation)
  • Windows 10 for 32-bit Systems
  • Windows 10 for x64-based Systems
  • Windows 10 Version 1607 for 32-bit Systems
  • Windows 10 Version 1607 for x64-based Systems
  • Windows Server 2016
  • Windows Server 2016 (Server Core installation)
  • Windows 8.1 for 32-bit systems
  • Windows 8.1 for x64-based systems
  • Windows RT 8.1
  • Windows Server, version 20H2 (Server Core Installation)
  • Windows 10 Version 20H2 for 32-bit Systems
  • Windows 10 Version 20H2 for ARM64-based Systems

ESU

  • Windows Server 2012
  • Windows Server 2012 (Server Core installation)
  • Windows Server 2012 R2
  • Windows Server 2012 R2 (Server Core installation)

Security Updates (10)

Acknowledgments

k0shl, Elliot Cao (<a href="https://twitter.com/iamelli0t">@iamelli0t</a>) working with <a href="https://www.zerodayinitiative.com/">Trend Micro Zero Day Initiative</a>” with “Lucas Leong (@_wmliang_) of Trend Micro's Zero Day Initiative, Maddie Stone of Google Project Zero

Revision History

  • 2021-01-12: Information published.