Moderate
CVE-2020-1301 Windows SMB Remote Code Execution Vulnerability
CVE-2020-1301 Windows SMB Remote Code Execution Vulnerability
Description
A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 1.0 (SMBv1) server handles certain requests, aka ‘Windows SMB Remote Code Execution Vulnerability’.
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Technical Analysis
To add to @busterb’s assessment, another thing to consider is that SMBv1, which this vulnerability relies on, is disabled by default on Windows 10 (Build 1803) according to https://www.petenetlive.com/KB/Article/0001461. This is further confirmed on Microsoft’s official website at https://docs.microsoft.com/en-us/windows-server/storage/file-server/troubleshoot/smbv1-not-installed-by-default-in-windows where they state that SMBv1 is not installed by default on Windows 10 version 1709 and later and Windows Server version 1709 and later.
Considering the push from Microsoft to force Windows 10 users to automatically upgrade, and the fact that according to https://gs.statcounter.com/os-version-market-share/windows/desktop/worldwide, 72.96% of Windows users are running Windows 10, the chances are that unless your in an environment where you need to support older software, SMBv1 is most likely going to be disabled.
Exploitability will most likely be difficult given the past history of SMB vulnerabilities, but may be easier on older versions of Windows such as Windows 7 that have not introduced the modern mitigations that Windows 10 has, particularly in the area of heap randomization.
Technical Analysis
It’s too early to really parse exactly what Microsoft means by ‘an authenticated attacker’ since this could mean a read-only guest user or something else entirely. It’s probably not all that interesting to get RCE on a target you can already log into unless there’s some sort of more restricted access that you want to privesc. I suspect we’ll see this one being leveraged more for LPE than RCE once the details are available, though there may also be lower hanging fruit as well.
CVSS V3 Severity and Metrics
General Information
Vendors
- microsoft
Products
- windows 10 -,
- windows 10 1607,
- windows 10 1709,
- windows 10 1803,
- windows 10 1809,
- windows 10 1903,
- windows 10 1909,
- windows 10 2004,
- windows 7 -,
- windows 8.1 -,
- windows rt 8.1 -,
- windows server 2008 -,
- windows server 2008 r2,
- windows server 2012 -,
- windows server 2012 r2,
- windows server 2016 -,
- windows server 2016 1803,
- windows server 2016 1903,
- windows server 2016 1909,
- windows server 2016 2004,
- windows server 2019 -
