[{"data":1,"prerenderedAt":292},["ShallowReactive",2],{"doku:en:richtlinien-anhang\u002Fhilfe-microsoft-policies-credentialsssp-allowencryptionoracle":3},{"seite":4,"start":37,"leiste":38,"bereich":291,"zurueck":291,"weiter":291},{"sprache":5,"rel":6,"zu":7,"id":8,"titel":9,"titelHtml":9,"beschreibung":10,"kennzeile":11,"imMenue":12,"html":13,"ueberschriften":14},"en","richtlinien-anhang\u002Fhilfe-microsoft-policies-credentialsssp-allowencryptionoracle","\u002Fen\u002Fdocumentation\u002Frichtlinien-anhang\u002Fhilfe-microsoft-policies-credentialsssp-allowencryptionoracle","referenz-hilfe-microsoft-policies-credentialsssp-allowencryptionoracle","Encryption Oracle Remediation","This `REG_DWORD` value selects the protection and compatibility level for applications and services that use the Credential Security Support Provider protocol (CredSSP), such as Remote Desktop Connection.","since 0.9.8.11",false,"\u003Ch2 id=\"purpose\">Purpose\u003C\u002Fh2>\n\u003Cdetails class=\"doku-klappbox\">\u003Csummary>Show registry keys (1)\u003C\u002Fsummary>\u003Cdiv class=\"doku-klappbox-inhalt\">\n\u003Cul>\n\u003Cli>\u003Ccode>HKLM\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\System\\CredSSP\\Parameters\\AllowEncryptionOracle\u003C\u002Fcode>\u003C\u002Fli>\n\u003C\u002Ful>\n\u003C\u002Fdiv>\u003C\u002Fdetails>\n\u003Cp>This \u003Ccode>REG_DWORD\u003C\u002Fcode> value selects the protection and compatibility level for applications and services that use the Credential Security Support Provider protocol (CredSSP), such as Remote Desktop Connection. It determines whether updated CredSSP clients may fall back to insecure protocol versions and whether CredSSP services accept unpatched clients.\u003C\u002Fp>\n\u003Cp>The supported value data has the following meaning:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Ccode>0\u003C\u002Fcode> – \u003Cstrong>Force Updated Clients:\u003C\u002Fstrong> Clients cannot fall back to insecure CredSSP versions. Services reject unpatched clients.\u003C\u002Fli>\n\u003Cli>\u003Ccode>1\u003C\u002Fcode> – \u003Cstrong>Mitigated:\u003C\u002Fstrong> Clients cannot fall back to insecure CredSSP versions. Services continue to accept unpatched clients.\u003C\u002Fli>\n\u003Cli>\u003Ccode>2\u003C\u002Fcode> – \u003Cstrong>Vulnerable:\u003C\u002Fstrong> Clients support fallback to insecure CredSSP versions. Services accept unpatched clients.\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2 id=\"notes\">Notes\u003C\u002Fh2>\n\u003Ch3 id=\"security\">Security\u003C\u002Fh3>\n\u003Cp>The setting forms part of the mitigation for CVE-2018-0886. With vulnerable CredSSP versions, an attacker can relay user credentials during authentication and use them to execute code on a target system.\u003C\u002Fp>\n\u003Cp>A value of \u003Ccode>2\u003C\u002Fcode> permits insecure protocol fallback and exposes remote servers to attacks involving vulnerable clients. A value of \u003Ccode>1\u003C\u002Fcode> prevents such fallback by the client but still allows services to accept unpatched clients. A value of \u003Ccode>0\u003C\u002Fcode> also rejects unpatched clients and therefore provides the strictest protection of the three levels.\u003C\u002Fp>\n\u003Ch3 id=\"possible-side-effects\">Possible side effects\u003C\u002Fh3>\n\u003Cp>Stricter protection levels can block CredSSP communication between systems with different patch levels. In particular, updated clients that prohibit insecure fallback cannot establish a CredSSP connection to an unpatched server. With value \u003Ccode>0\u003C\u002Fcode>, CredSSP services also refuse connections from unpatched clients.\u003C\u002Fp>\n\u003Cp>This can affect Remote Desktop Connection and other applications that rely on CredSSP authentication. Windows may report an authentication error and record system event \u003Ccode>6041\u003C\u002Fcode> when a client and remote host cannot negotiate an allowed protocol version. Results can differ when a Remote Desktop server uses a TLS authentication fallback, because Microsoft's interoperability matrix describes CredSSP behavior only.\u003C\u002Fp>\n\u003Ch3 id=\"notes-1\">Notes\u003C\u002Fh3>\n\u003Cp>Microsoft changed the default behavior of updated systems from \u003Cstrong>Vulnerable\u003C\u002Fstrong> to \u003Cstrong>Mitigated\u003C\u002Fstrong> with the security updates released on May 8, 2018. Microsoft also documents that a change to \u003Ccode>AllowEncryptionOracle\u003C\u002Fcode> requires a restart.\u003C\u002Fp>\n\u003Cp>The value controls the behavior of appropriately updated CredSSP components. It does not replace the security updates that correct the underlying vulnerability.\u003C\u002Fp>\n\u003Ch3 id=\"microsoft-documentation\">Microsoft documentation\u003C\u002Fh3>\n\u003Cp>\u003Ca href=\"https:\u002F\u002Flearn.microsoft.com\u002Fen-us\u002Fwindows\u002Fclient-management\u002Fmdm\u002Fpolicy-csp-admx-credssp\">Microsoft Learn: ADMX_CredSsp Policy CSP\u003C\u002Fa>\u003C\u002Fp>\n\u003Cp>\u003Ca href=\"https:\u002F\u002Fsupport.microsoft.com\u002Fen-us\u002Fservicing\u002Fos\u002Fwindows-server\u002F2019\u002F09\u002Fcredssp-updates-for-cve-2018-0886\">Microsoft Support: CredSSP updates for CVE-2018-0886\u003C\u002Fa>\u003C\u002Fp>\n\u003Ch2 id=\"see-also\">See also\u003C\u002Fh2>\n\u003Cul>\n\u003Cli>\u003Ca href=\"\u002Fen\u002Fdocumentation\u002Frichtlinien-anhang\u002Frichtlinien-netzwerk-freigaben#e-609969002e\">Entry in the 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computer","\u002Fen\u002Fdocumentation\u002Finstallationsmedien\u002Finstall-assist",{"titel":148,"pfad":149,"seiten":150},"Machines","pruefmaschine",[151,155,159],{"rel":152,"titel":153,"zu":154},"pruefmaschine\u002Fhyper-v-berechtigungen","Hyper-V permissions","\u002Fen\u002Fdocumentation\u002Fpruefmaschine\u002Fhyper-v-berechtigungen",{"rel":156,"titel":157,"zu":158},"pruefmaschine\u002Fverwenden","Use the test machine","\u002Fen\u002Fdocumentation\u002Fpruefmaschine\u002Fverwenden",{"rel":160,"titel":161,"zu":162},"pruefmaschine\u002Ferstellen","Create a machine","\u002Fen\u002Fdocumentation\u002Fpruefmaschine\u002Ferstellen",{"titel":164,"pfad":165,"seiten":166},"Editions","editionen",[167,171,175],{"rel":168,"titel":169,"zu":170},"editionen\u002Fvergleich","Editions at a glance","\u002Fen\u002Fdocumentation\u002Feditionen\u002Fvergleich",{"rel":172,"titel":173,"zu":174},"editionen\u002Flizenz-aktivieren","Activate a license","\u002Fen\u002Fdocumentation\u002Feditionen\u002Flizenz-aktivieren",{"rel":176,"titel":177,"zu":178},"editionen\u002Faktivierungen-zuruecksetzen","Reset activations","\u002Fen\u002Fdocumentation\u002Feditionen\u002Faktivierungen-zuruecksetzen",{"titel":180,"pfad":181,"seiten":182},"Troubleshooting","fehler",[183,187,191,195,199],{"rel":184,"titel":185,"zu":186},"fehler\u002Fusb","USB drive problems","\u002Fen\u002Fdocumentation\u002Ffehler\u002Fusb",{"rel":188,"titel":189,"zu":190},"fehler\u002Fiso","ISO import problems","\u002Fen\u002Fdocumentation\u002Ffehler\u002Fiso",{"rel":192,"titel":193,"zu":194},"fehler\u002Fhyperv","Hyper-V problems","\u002Fen\u002Fdocumentation\u002Ffehler\u002Fhyperv",{"rel":196,"titel":197,"zu":198},"fehler\u002Finstall-assist","When Setup fails on the target computer","\u002Fen\u002Fdocumentation\u002Ffehler\u002Finstall-assist",{"rel":200,"titel":201,"zu":202},"fehler\u002Fantwortdatei","The answer 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tasks","\u002Fen\u002Fdocumentation\u002Fwindows-anhang\u002Faufgaben",{"rel":232,"titel":233,"zu":234},"windows-anhang\u002Fapps","App packages","\u002Fen\u002Fdocumentation\u002Fwindows-anhang\u002Fapps",{"titel":236,"pfad":237,"seiten":238},"Policy appendix","richtlinien-anhang",[239,243,247,251,255,259,263,267,271,275,279,283,287],{"rel":240,"titel":241,"zu":242},"richtlinien-anhang\u002Frichtlinien","Policy reference","\u002Fen\u002Fdocumentation\u002Frichtlinien-anhang\u002Frichtlinien",{"rel":244,"titel":245,"zu":246},"richtlinien-anhang\u002Frichtlinien-office-haertung","Office hardening","\u002Fen\u002Fdocumentation\u002Frichtlinien-anhang\u002Frichtlinien-office-haertung",{"rel":248,"titel":249,"zu":250},"richtlinien-anhang\u002Frichtlinien-edge-internet-explorer","Edge and Internet Explorer","\u002Fen\u002Fdocumentation\u002Frichtlinien-anhang\u002Frichtlinien-edge-internet-explorer",{"rel":252,"titel":253,"zu":254},"richtlinien-anhang\u002Frichtlinien-virenschutz-angriffsflaechen","Virus protection and attack surface","\u002Fen\u002Fdocumentation\u002Frichtlinien-anhang\u002Frichtlinien-virenschutz-angriffsflaechen",{"rel":256,"titel":257,"zu":258},"richtlinien-anhang\u002Frichtlinien-netzwerk-freigaben","Network and file sharing","\u002Fen\u002Fdocumentation\u002Frichtlinien-anhang\u002Frichtlinien-netzwerk-freigaben",{"rel":260,"titel":261,"zu":262},"richtlinien-anhang\u002Frichtlinien-datenschutz-telemetrie","Privacy and telemetry","\u002Fen\u002Fdocumentation\u002Frichtlinien-anhang\u002Frichtlinien-datenschutz-telemetrie",{"rel":264,"titel":265,"zu":266},"richtlinien-anhang\u002Frichtlinien-protokollierung-ueberwachung","Logging and auditing","\u002Fen\u002Fdocumentation\u002Frichtlinien-anhang\u002Frichtlinien-protokollierung-ueberwachung",{"rel":268,"titel":269,"zu":270},"richtlinien-anhang\u002Frichtlinien-anmeldung-konten","Sign-in and accounts","\u002Fen\u002Fdocumentation\u002Frichtlinien-anhang\u002Frichtlinien-anmeldung-konten",{"rel":272,"titel":273,"zu":274},"richtlinien-anhang\u002Frichtlinien-geraete-wechselmedien","Devices and removable media","\u002Fen\u002Fdocumentation\u002Frichtlinien-anhang\u002Frichtlinien-geraete-wechselmedien",{"rel":276,"titel":277,"zu":278},"richtlinien-anhang\u002Frichtlinien-kernschutz","Kernel protection","\u002Fen\u002Fdocumentation\u002Frichtlinien-anhang\u002Frichtlinien-kernschutz",{"rel":280,"titel":281,"zu":282},"richtlinien-anhang\u002Frichtlinien-laufwerksverschluesselung","Drive encryption","\u002Fen\u002Fdocumentation\u002Frichtlinien-anhang\u002Frichtlinien-laufwerksverschluesselung",{"rel":284,"titel":285,"zu":286},"richtlinien-anhang\u002Frichtlinien-windows-update","Windows Update","\u002Fen\u002Fdocumentation\u002Frichtlinien-anhang\u002Frichtlinien-windows-update",{"rel":288,"titel":289,"zu":290},"richtlinien-anhang\u002Frichtlinien-grundeinstellungen","Defaults and privacy settings","\u002Fen\u002Fdocumentation\u002Frichtlinien-anhang\u002Frichtlinien-grundeinstellungen",null,1793199128553]