All vulnerabilities
CVE-2020-0601

Microsoft Windows CryptoAPI Spoofing Vulnerability

Microsoft WindowsOperating systems
Open in ThreatlineRecord JSON
CVSS
8.1High
ExploitationExploited in the wildAdded to KEV 3 Nov 2021CISA KEV
Exploit odds (EPSS)89.4%Chance of exploitation activity in the next 30 days, higher than 99% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Federal deadline3 May 2022Remediation due date for US federal agenciesCISA KEV
CISA required actionApply updates per vendor instructions. CISA KEV

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Timeline

  1. 14 Jan 2020, 23:11 UTCPublishedCVE List
  2. 15 Jan 2020Exploit code publicExploit-DB
  3. 3 Nov 2021Added to CISA KEVCISA KEV

Public exploit code and templates 1

  • Local exploitMicrosoft Windows - CryptoAPI (Crypt32.dll) Elliptic Curve Cryptography (ECC) Spoof Code-Signing Certificate 15 Jan 2020Exploit-DB

Listed so defenders can prioritize. Threatline links to the source and does not host exploit code.

Description

Microsoft Windows CryptoAPI (Crypt32.dll) contains a spoofing vulnerability in the way it validates Elliptic Curve Cryptography (ECC) certificates. An attacker could exploit the vulnerability by using a spoofed code-signing certificate to sign a malicious executable, making it appear the file was from a trusted, legitimate source. A successful exploit could also allow the attacker to conduct man-in-the-middle attacks and decrypt confidential information on user connections to the affected software. The vulnerability is also known under the moniker of CurveBall.

Text from CVE List

Affected versions 26

  • Windowsaffected: 10 Version 1803 for 32-bit SystemsCVE List
  • Windowsaffected: 10 Version 1803 for x64-based SystemsCVE List
  • Windowsaffected: 10 Version 1803 for ARM64-based SystemsCVE List
  • Windowsaffected: 10 Version 1809 for 32-bit SystemsCVE List
  • Windowsaffected: 10 Version 1809 for x64-based SystemsCVE List
  • Windowsaffected: 10 Version 1809 for ARM64-based SystemsCVE List
  • Windowsaffected: 10 Version 1709 for 32-bit SystemsCVE List
  • Windowsaffected: 10 Version 1709 for x64-based SystemsCVE List
  • Windowsaffected: 10 Version 1709 for ARM64-based SystemsCVE List
  • Windowsaffected: 10 for 32-bit SystemsCVE List
  • Windowsaffected: 10 for x64-based SystemsCVE List
  • Windowsaffected: 10 Version 1607 for 32-bit SystemsCVE List
  • Windowsaffected: 10 Version 1607 for x64-based SystemsCVE List
  • Windows Serveraffected: version 1803 (Core Installation)CVE List
  • Windows Serveraffected: 2019CVE List
  • Windows Serveraffected: 2019 (Core installation)CVE List
  • Windows Serveraffected: 2016CVE List
  • Windows Serveraffected: 2016 (Core installation)CVE List
  • Windows 10 Version 1903 for 32-bit Systemsaffected: unspecifiedCVE List
  • Windows 10 Version 1903 for x64-based Systemsaffected: unspecifiedCVE List
  • Windows 10 Version 1903 for ARM64-based Systemsaffected: unspecifiedCVE List
  • Windows Server, version 1903 (Server Core installation)affected: unspecifiedCVE List
  • Windows 10 Version 1909 for 32-bit Systemsaffected: unspecifiedCVE List
  • Windows 10 Version 1909 for x64-based Systemsaffected: unspecifiedCVE List
  • Windows Server, version 1909 (Server Core installation)affected: unspecifiedCVE List
  • Windows 10 Version 1909 for ARM64-based Systemsaffected: unspecifiedCVE List

References 2