CVE-2022-21907
A REAL DoS exploit for CVE-2022-21907 It supports IPv4/IPv6/HTTP/HTTPS
Affect
- 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
Mitigations
- 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.
FAQ
- 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