- Windows - 10 Version 1809 for 32-bit Systems - 10 Version 1809 for x64-based Systems - 10 Version 1809 for ARM64-based Systems - 10 Version 21H1 for 32-bit Systems - 10 Version 21H1 for x64-based System - 10 Version 21H1 for ARM64-based Systems - 10 Version 20H2 for 32-bit Systems - 10 Version 20H2 for x64-based Systems - 10 Version 20H2 for ARM64-based Systems - 10 Version 21H2 for 32-bit Systems - 10 Version 21H2 for x64-based Systems - 10 Version 21H2 for ARM64-based Systems - 11 for x64-based Systems - 11 for ARM64-based Systems - Windows Server - 2019 - 2019 (Core installation) - 2022 - 2022 (Server Core installation) - version 20H2 (Server Core Installation)
Using the PoC
- ./cve-2022-21907.py -t 192.168.0.13 -p 80 -v 4
- Windows Server 2019 and Windows 10 version 1809 are not vulnerable by default. Unless you have enabled the HTTP Trailer Support via EnableTrailerSupport registry value, the systems are not vulnerable. - Delete the DWORD registry value "EnableTrailerSupport" if present under: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\HTTP\Parameters - This mitigation only applies to Windows Server 2019 and Windows 10, version 1809 and does not apply to the Windows 20H2 and newer.
- How could an attacker exploit this vulnerability? - In most situations, an unauthenticated attacker could send a specially crafted packet to a targeted server utilizing the HTTP Protocol Stack (http.sys) to process packets. - Is this wormable? - Yes. Microsoft recommends prioritizing the patching of affected servers. - Windows 10, Version 1909 is not in the Security Updates table. Is it affected by this vulnerability? - No, the vulnerable code does not exist in Windows 10, version 1909. It is not affected by this vulnerability. - Is the EnableTrailerSupport registry key present in any other platform than Windows Server 2019 and Windows 10, version 1809? - No, the registry key is only present in Windows Server 2019 and Windows 10, version 1809
The DoS Exploit is a github repository by polakow