CVE-2025-11561

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In default configurations, the Kerberos local authentication plugin (sssd_krb5_localauth_plugin) is enabled, but a fallback to the an2ln plugin is possible. This fallback allows an attacker with permission to modify certain AD attributes (such as userPrincipalName or samAccountName) to impersonate privileged users, potentially resulting in unauthorized access or privilege escalation on domain-joined Linux hosts."}], "affected": [{"versions": [{"status": "affected", "version": "0", "versionType": "semver", "lessThanOrEqual": "2.11.1"}], "packageName": "sssd", "collectionURL": "https://sssd.io/", "defaultStatus": "unaffected"}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "sssd", "defaultStatus": "affected", "versions": [{"version": "0:2.10.2-3.el10_0.3", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/o:redhat:enterprise_linux:10.0"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": 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Apply vendor updates and follow Red Hat guidance for SSSD hardening."}], "timeline": [{"lang": "en", "time": "2025-10-09T12:57:29.851Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2025-10-09T00:00:00.000Z", "value": "Made public."}], "credits": [{"lang": "en", "value": "Red Hat would like to thank Zavier Lee for reporting this issue."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-11-04T21:29:08.211Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-11561", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2025-10-10T03:55:25.417800Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-02-26T17:47:57.941Z"}}]}}

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{"acknowledgement": "Red Hat would like to thank Zavier Lee for reporting this issue.", "bugzilla": {"description": "sssd: SSSD default Kerberos configuration allows privilege escalation on AD-joined Linux systems", "id": "2402727", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2402727"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-269", "details": ["A flaw was found in the integration of Active Directory and the System Security Services Daemon (SSSD) on Linux systems. In default configurations, SSSD does not enable the Kerberos local authentication plugin (sssd_krb5_localauth_plugin), allowing an attacker with permission to modify certain AD attributes (such as userPrincipalName or samAccountName) to impersonate privileged users. This can result in unauthorized access or privilege escalation on domain-joined Linux hosts."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, ensure the SSSD Kerberos local authentication plugin (sssd_krb5_localauth_plugin) is explicitly enabled on domain-joined Linux systems. Configure it with disable = an2ln for AD or IPA providers in /etc/sssd/sssd.conf or the relevant included krb5.conf files. This prevents improper principal-to-local-user mapping and reduces the risk of unauthorized privilege escalation. Apply vendor-supplied updates and follow Red Hat guidance for SSSD hardening."}, "name": "CVE-2025-11561", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "sssd", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "sssd", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "sssd", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "sssd", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "sssd", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2025-10-09T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-11561\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-11561\nhttps://blog.async.sg/kerberos-ldr"], "statement": "The Red Hat Product Security team has assessed this issue as High severity for domain-joined Linux systems using default SSSD configurations. When the Kerberos local authentication plugin (sssd_krb5_localauth_plugin) is not enabled, it may allow a domain user who can modify certain Active Directory attributes (such as userPrincipalName or samAccountName) to map to privileged local accounts. This could lead to unauthorized access or elevated privileges on the affected Linux hosts. Administrators are advised to review and apply recommended hardening configurations to mitigate this behavior.", "threat_severity": "Important"}

{}