Actively exploited · Published Mar 12, 2020 · Assigned by microsoft
CVE-2020-0796
Critical 10.0 Exploited Ransomware
In plain English
A critical-severity memory corruption in Windows 10 Version 1903 for 32-bit Systems from Microsoft. Attackers are actively exploiting it in the wild (listed by CISA on February 10, 2022). It has been used in ransomware campaigns. The chance it is exploited in the next 30 days is estimated at 99.8% (higher than 99.9% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit, Nuclei, public proof-of-concept code. Apply updates per vendor instructions.
CISA guidance
Apply updates per vendor instructions.
Federal agencies must remediate by Aug 10, 2022.
Official description
A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 3.1.1 (SMBv3) protocol handles certain requests, aka 'Windows SMBv3 Client/Server Remote Code Execution Vulnerability'.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 Version 1903 for 32-bit Systems | unspecified |
| Microsoft | Windows 10 Version 1903 for x64-based Systems | unspecified |
| Microsoft | Windows 10 Version 1903 for ARM64-based Systems | unspecified |
| Microsoft | Windows Server, version 1903 (Server Core installation) | unspecified |
| Microsoft | Windows 10 Version 1909 for 32-bit Systems | unspecified |
| Microsoft | Windows 10 Version 1909 for x64-based Systems | unspecified |
| Microsoft | Windows 10 Version 1909 for ARM64-based Systems | unspecified |
| Microsoft | Windows Server, version 1909 (Server Core installation) | unspecified |
Weakness: CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0796 x_refsource_MISC
- http://packetstormsecurity.com/files/156731/CoronaBlue-SMBGhost-Microsoft-Windows-10-SMB-3.1.1-Proof-Of-Concept.html x_refsource_MISC
- http://packetstormsecurity.com/files/156732/Microsoft-Windows-SMB-3.1.1-Remote-Code-Execution.html x_refsource_MISC
- http://packetstormsecurity.com/files/156980/Microsoft-Windows-10-SMB-3.1.1-Local-Privilege-Escalation.html x_refsource_MISC
- http://packetstormsecurity.com/files/157110/SMBv3-Compression-Buffer-Overflow.html x_refsource_MISC
- http://packetstormsecurity.com/files/157901/Microsoft-Windows-SMBGhost-Remote-Code-Execution.html x_refsource_MISC
- http://packetstormsecurity.com/files/158054/SMBleed-SMBGhost-Pre-Authentication-Remote-Code-Execution-Proof-Of-Concept.html x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0796 government-resource