CVE-2020-17140HighCVSS 8.1

Windows SMB Information Disclosure Vulnerability

Published
December 8, 2020
Last Modified
—

🔗 CVE IDs covered (1)

CVE-2020-17140 →

📋 Description

Does this security update target the Server or Client side? In this case the fix targets both sides. Specifically the smb2.srv binary is the primary fix target, which is housed on both sides of the connection.

What type of information could be disclosed by this vulnerability? The type of information that could be disclosed if an attacker successfully exploited this vulnerability is the contents of Kernel memory. An attacker could read the contents of Kernel memory from a user mode process.

How could an attacker exploit this vulnerability? In a network-based attack, an authenticated attacker would need to open a specific file with captured oplock lease, then perform repeated specific modifications to that file.

🎯 Affected products40

  • Windows 10 Version 1607 for 32-bit Systems
  • Windows 10 Version 1607 for x64-based Systems
  • Windows 10 Version 1803 for 32-bit Systems
  • Windows 10 Version 1803 for ARM64-based Systems
  • Windows 10 Version 1803 for x64-based Systems
  • Windows 10 Version 1809 for 32-bit Systems
  • Windows 10 Version 1809 for ARM64-based Systems
  • Windows 10 Version 1809 for x64-based Systems
  • Windows 10 Version 1903 for 32-bit Systems
  • Windows 10 Version 1903 for ARM64-based Systems
  • Windows 10 Version 1903 for x64-based Systems
  • Windows 10 Version 1909 for 32-bit Systems
  • Windows 10 Version 1909 for ARM64-based Systems
  • Windows 10 Version 1909 for x64-based Systems
  • 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 10 Version 20H2 for 32-bit Systems
  • Windows 10 Version 20H2 for ARM64-based Systems
  • Windows 10 for 32-bit Systems
  • Windows 10 for x64-based Systems
  • Windows 7 for 32-bit Systems Service Pack 1
  • Windows 7 for x64-based Systems Service Pack 1
  • Windows 8.1 for 32-bit systems
  • Windows 8.1 for x64-based systems
  • Windows RT 8.1
  • Windows Server 2008 R2 for x64-based Systems Service Pack 1
  • Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
  • Windows Server 2012
  • Windows Server 2012 (Server Core installation)
  • +10 more not shown

✅ Remediation

KB4592438 (Security Update) KB4592446 (Security Update) KB4592440 (Security Update) KB4592449 (Security Update) KB4592464 (Security Update) KB4593226 (Security Update) KB4592471 (Monthly Rollup) — fixed build 6.1.7601.24563 KB4592503 (Security Only) KB4592484 (Monthly Rollup) KB4592495 (Security Only) KB4592468 (Monthly Rollup) KB4592497 (Security Only)

🔗 References (25)