High [CVE-2025-11561] Sssd: sssd default kerberos configuration allows privilege escalation on ad-joined linux systems
This high-severity Red Hat Linux advisory covers CVE-2025-11561 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7 Extended Lifecycle Support, Red Hat Enterprise Linux 8.2 Advanced Update Support.
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Summary
A flaw was found in the integration of Active Directory and the System Security Services Daemon (SSSD) on Linux systems. 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.
The Red Hat Product Security team has assessed this issue as High severity for domain-joined Linux systems using default SSSD configurations. This could lead to unauthorized access or elevated privileges on affected Linux hosts.
Administrators are advised to review and apply recommended hardening configurations to mitigate this behavior. Red Hat severity: Important — CVSS 8.8 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
Weakness: CWE-269.
Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8.2 Advanced Update Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; and 23 more.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
- sssd-0:2.10.2-3.el10_0.3
- sssd-0:2.11.1-2.el10_1.1
- sssd-0:1.16.5-10.el7_9.17
- sssd-0:2.9.4-5.el8_10.3
- sssd-0:2.2.3-20.el8_2.3
- sssd-0:2.4.0-9.el8_4.4
- sssd-0:2.6.2-4.el8_6.4
- sssd-0:2.8.2-4.el8_8.3
- sssd-0:2.9.7-4.el9_7.1
- sssd-0:2.6.2-4.el9_0.4
- sssd-0:2.8.2-5.el9_2.6
- sssd-0:2.9.4-6.el9_4.4
- sssd-0:2.9.6-4.el9_6.3
- rhcos-412.86.202601061735-0
- rhcos-413.92.202601130113-0
- rhcos-414.92.202511122212-0
- rhcos-415.92.202512100122-0
- rhcos-416.94.202512030118-0
- rhcos-417.94.202511260612-0
- rhcos-418.94.202511170715-0
- rhcos-4.19.9.6.202511252219-0
- rhcos-4.20.9.6.202511252309-0
- rhceph/rhceph-7-rhel9:7
- rhceph/rhceph-8-rhel9:8
- RHSA-2025:19851
- RHSA-2025:21020
- RHSA-2025:19847
- RHSA-2025:19610
- RHSA-2025:19859
- RHSA-2025:19848
- RHSA-2025:19849
- RHSA-2025:19853
- RHSA-2025:20954
- RHSA-2025:19850
- RHSA-2025:19854
- RHSA-2025:19852
- RHSA-2025:21067
- RHSA-2026:0316
- RHSA-2026:0677
- RHSA-2025:21329
- RHSA-2025:23113
- RHSA-2025:22724
- RHSA-2025:22265
- RHSA-2025:21795
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- To mitigate this issue, ensure the SSSD Kerberos local authentication plugin (sssd_krb5_localauth_plugin) is configured and the an2ln plugin is disabled by adding "disable = an2ln" in a krb5 include file, for example /var/lib/sss/pubconf/krb5.include.d/localauth_plugin and make sure it is included in the Kerberos configuration. Apply vendor updates and follow Red Hat guidance for SSSD hardening.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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