CVE-2021-31166 PoC — Microsoft HTTP.sys 资源管理错误漏洞

Description

Exploit for MS Http Protocol Stack RCE vulnerability (CVE-2021-31166)

介绍

# CVE-2021-31166-Exploit
Exploit for MS Http Protocol Stack RCE vulnerability (CVE-2021-31166)

A specially crafted Http request targetting a vulnerable windows version will result into DOS attack. And the server will be rebooted with blue screen error.
Http.sys is a windows kernel driver responsible for handling http requests and crafting a response for those.
This vulnerable http.sys driver can't handle crafted "Accept-Encoding" header, and gets crashed. Resultantly, the server will reboot.
On the blue screen, we can see error with "Stop Code: KERNEL SECURITY CHECK FAILED"
This is a critical vulnerability with CVSS 9.8, easy to exploit.

Vulnerable windows versions:
Windows 10, and Windows Server 2016 (20h2 and 2004 releases for both)

More Ref:

https://nvd.nist.gov/vuln/detail/CVE-2021-31166

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-31166

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