{ "document": { "aggregate_severity": { "namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system", "text": "Important" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "Public", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en-US", "notes": [ { "category": "general", "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle", "title": "Additional Resources" }, { "category": "legal_disclaimer", "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.", "title": "Disclaimer" }, { "category": "general", "text": "Required. The vulnerability documented by this CVE requires customer action to resolve.", "title": "Customer Action" } ], "publisher": { "category": "vendor", "contact_details": "secure@microsoft.com", "name": "Microsoft Security Response Center", "namespace": "https://msrc.microsoft.com" }, "references": [ { "category": "self", "summary": "CVE-2021-36942 Windows LSA Spoofing Vulnerability - HTML", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36942" }, { "category": "self", "summary": "CVE-2021-36942 Windows LSA Spoofing Vulnerability - CSAF", "url": "https://msrc.microsoft.com/csaf/advisories/2021/msrc_cve-2021-36942.json" }, { "category": "external", "summary": "Microsoft Exploitability Index", "url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1" }, { "category": "external", "summary": "Microsoft Support Lifecycle", "url": "https://support.microsoft.com/lifecycle" }, { "category": "external", "summary": "Common Vulnerability Scoring System", "url": "https://www.first.org/cvss" } ], "title": "Windows LSA Spoofing Vulnerability", "tracking": { "current_release_date": "2021-08-10T07:00:00.000Z", "generator": { "date": "2026-08-10T15:09:50.413Z", "engine": { "name": "MSRC Generator", "version": "1.0" } }, "id": "msrc_CVE-2021-36942", "initial_release_date": "2021-08-10T07:00:00.000Z", "revision_history": [ { "date": "2021-08-10T07:00:00.000Z", "legacy_version": "1", "number": "1", "summary": "Information published." } ], "status": "final", "version": "1" } }, "product_tree": { "branches": [ { "branches": [ { "category": "product_version_range", "name": "<10.0.17763.2114", "product": { "name": "Windows Server 2019 <10.0.17763.2114", "product_id": "4" } }, { "category": "product_version", "name": "10.0.17763.2114", "product": { "name": "Windows Server 2019 10.0.17763.2114", "product_id": "11571" } } ], "category": "product_name", "name": "Windows Server 2019" }, { "branches": [ { "category": "product_version_range", "name": 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"product": { "name": "Windows Server 2012 (Server Core installation) 6.2.9200.23435", "product_id": "10379" } } ], "category": "product_name", "name": "Windows Server 2012 (Server Core installation)" }, { "branches": [ { "category": "product_version_range", "name": "<6.3.9600.20094", "product": { "name": "Windows Server 2012 R2 <6.3.9600.20094", "product_id": "8" } }, { "category": "product_version", "name": "6.3.9600.20094", "product": { "name": "Windows Server 2012 R2 6.3.9600.20094", "product_id": "10483" } } ], "category": "product_name", "name": "Windows Server 2012 R2" }, { "branches": [ { "category": "product_version_range", "name": "<6.3.9600.20094", "product": { "name": "Windows Server 2012 R2 (Server Core installation) <6.3.9600.20094", "product_id": "7" } }, { "category": "product_version", "name": "6.3.9600.20094", "product": { "name": "Windows Server 2012 R2 (Server Core installation) 6.3.9600.20094", "product_id": "10543" } } ], "category": "product_name", "name": "Windows Server 2012 R2 (Server Core installation)" } ] }, "vulnerabilities": [ { "cve": "CVE-2021-36942", "notes": [ { "category": "general", "text": "Microsoft", "title": "Assigning CNA" }, { "category": "faq", "text": "An unauthenticated attacker could call a method on the LSARPC interface and coerce the domain controller to authenticate against another server using NTLM. This security update blocks the affected API calls OpenEncryptedFileRawA and OpenEncryptedFileRawW through LSARPC interface.\nYes. Please see ADV210003 Mitigating NTLM Relay Attacks on Active Directory Certificate Services (AD CS).\nYes. Please see KB5005413 for more information on the steps that you need to take to protect your system. Please note that the combined CVSS score would be 9.8 when this vulnerability is chained with the noted NTLM Relay Attacks on Active Directory Certificate Services (AD CS).\nYes. This vulnerability affects all servers but domain controllers should be prioritized in terms of applying security updates.\nThe EFS API OpenEncryptedFileRaw(A/W), often used in backup software, continues to work in all versions of Windows (local and remote), except when backing up to or from a system running Windows Server 2008 SP2. OpenEncryptedFileRaw will no longer work on Windows Server 2008 SP2.", "title": "How could an attacker exploit this vulnerability?" } ], "product_status": { "fixed": [ "9312", "9318", "9344", "10049", "10051", "10287", "10378", "10379", "10483", "10543", "10816", "10855", "11571", "11572", "11769", "11803" ], "known_affected": [ "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16" ] }, "references": [ { "category": "self", "summary": "CVE-2021-36942 Windows LSA Spoofing Vulnerability - HTML", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36942" }, { "category": "self", "summary": "CVE-2021-36942 Windows LSA Spoofing Vulnerability - CSAF", "url": "https://msrc.microsoft.com/csaf/advisories/2021/msrc_cve-2021-36942.json" } ], "remediations": [ { "category": "vendor_fix", "date": "2021-08-10T07:00:00.000Z", "details": "10.0.17763.2114:Security Update:https://support.microsoft.com/help/5005030", "product_ids": [ "4", "3" ], "url": "https://support.microsoft.com/help/5005030" }, { "category": "vendor_fix", "date": "2021-08-10T07:00:00.000Z", "details": "10.0.19041.1165:Security Update:https://support.microsoft.com/help/5005033", "product_ids": [ "2" ], "url": "https://support.microsoft.com/help/5005033" }, { "category": "vendor_fix", "date": "2021-08-10T07:00:00.000Z", "details": "10.0.19042.1165:Security Update:https://support.microsoft.com/help/5005033", "product_ids": [ "1" ], "url": "https://support.microsoft.com/help/5005033" }, { "category": "vendor_fix", "date": "2021-08-10T07:00:00.000Z", "details": "10.0.14393.4583:Security Update:https://support.microsoft.com/help/5005043", "product_ids": [ "6", "5" ], "url": "https://support.microsoft.com/help/5005043" }, { "category": "vendor_fix", "date": "2021-08-10T07:00:00.000Z", "details": "6.0.6003.21192:Monthly Rollup:https://support.microsoft.com/help/5005090", "product_ids": [ "16", "11", "15", "14" ], "url": "https://support.microsoft.com/help/5005090" }, { "category": "vendor_fix", "date": "2021-08-10T07:00:00.000Z", "details": "6.0.6003.21192:Security Only:https://support.microsoft.com/help/5005095", "product_ids": [ "16", "11", "15", "14" ], "url": "https://support.microsoft.com/help/5005095" }, { "category": "vendor_fix", "date": "2021-08-10T07:00:00.000Z", "details": "6.1.7601.25685:Monthly Rollup:https://support.microsoft.com/help/5005088", "product_ids": [ "12", "13" ], "url": "https://support.microsoft.com/help/5005088" }, { "category": "vendor_fix", "date": "2021-08-10T07:00:00.000Z", "details": "6.1.7601.25685:Security Only:https://support.microsoft.com/help/5005089", "product_ids": [ "12", "13" ], "url": "https://support.microsoft.com/help/5005089" }, { "category": "vendor_fix", "date": "2021-08-10T07:00:00.000Z", "details": "6.2.9200.23435:Monthly Rollup:https://support.microsoft.com/help/5005099", "product_ids": [ "10", "9" ], "url": "https://support.microsoft.com/help/5005099" }, { "category": "vendor_fix", "date": "2021-08-10T07:00:00.000Z", "details": "6.2.9200.23435:Security Only:https://support.microsoft.com/help/5005094", "product_ids": [ "10", "9" ], "url": "https://support.microsoft.com/help/5005094" }, { "category": "vendor_fix", "date": "2021-08-10T07:00:00.000Z", "details": "6.3.9600.20094:Monthly Rollup:https://support.microsoft.com/help/5005076", "product_ids": [ "8", "7" ], "url": "https://support.microsoft.com/help/5005076" }, { "category": "vendor_fix", "date": "2021-08-10T07:00:00.000Z", "details": "6.3.9600.20094:Security Only:https://support.microsoft.com/help/5005106", "product_ids": [ "8", "7" ], "url": "https://support.microsoft.com/help/5005106" } ], "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "environmentalScore": 0.0, "exploitCodeMaturity": "FUNCTIONAL", "integrityImpact": "NONE", "privilegesRequired": "NONE", "remediationLevel": "OFFICIAL_FIX", "reportConfidence": "CONFIRMED", "scope": "UNCHANGED", "temporalScore": 7.0, "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C", "version": "3.1" }, "products": [ "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16" ] } ], "threats": [ { "category": "impact", "details": "Spoofing" }, { "category": "exploit_status", "details": "Publicly Disclosed:Yes;Exploited:No;Latest Software Release:Exploitation More Likely;Older Software Release:Exploitation More Likely" } ], "title": "Windows LSA Spoofing Vulnerability" } ] }