CVE-2022-21907

• CVE-2022-21907

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** Description - POC for CVE-2022-21907: HTTP Protocol Stack Remote Code Execution Vulnerability. - create by antx at 2022-01-17.

** Detail - HTTP Protocol Stack Remote Code Execution Vulnerability. - Similar to [[https://github.com/antx-code/CVE-2021-31166][CVE-2021-31166]]. - This problem exists, from last year which is reported on [[https://github.com/antx-code/CVE-2021-31166][CVE-2021-31166]], and still there.

** CVE Severity - attackComplexity: LOW - attackVector: NETWORK - availabilityImpact: HIGH - confidentialityImpact: HIGH - integrityImpact: HIGH - privilegesRequired: NONE - scope: UNCHANGED - userInteraction: NONE - version: 3.1 - baseScore: 9.8 - baseSeverity: CRITICAL

** 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)

** POC - [[./CVE-2022-21907.py][Poc]]

** 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: #+begin_src bash HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\HTTP\Parameters #+end_src - 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

** Reference - Ref-Source - [[https://github.com/mauricelambert/CVE-2022-21907]] - [[https://github.com/nu11secur1ty/Windows10Exploits/tree/master/2022/CVE-2022-21907]] - Ref-Risk - [[https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2022-21907][HTTP Protocol Stack Remote Code Execution Vulnerability]] - [[https://nvd.nist.gov/vuln/detail/CVE-2022-21907][NVD]] - CVE - [[https://github.com/CVEProject/cvelist/blob/master/2022/21xxx/CVE-2022-21907.json][CVE-2022-21907]] - [[https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-21907][CVE-2022-21907]] - Ref-Related - [[https://github.com/antx-code/CVE-2021-31166][CVE-2021-31166]]