CVE-2025-11561

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.

Affected Software

VendorProductVersion RangeStatus
0 <= 2.11.1affected
Red HatRed Hat Enterprise Linux 100:2.10.2-3.el10_0.3 < *unaffected
Red HatRed Hat Enterprise Linux 100:2.11.1-2.el10_1.1 < *unaffected
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Support0:1.16.5-10.el7_9.17 < *unaffected
Red HatRed Hat Enterprise Linux 80:2.9.4-5.el8_10.3 < *unaffected
Red HatRed Hat Enterprise Linux 80:2.9.4-5.el8_10.3 < *unaffected
Red HatRed Hat Enterprise Linux 8.2 Advanced Update Support0:2.2.3-20.el8_2.3 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support0:2.4.0-9.el8_4.4 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On0:2.4.0-9.el8_4.4 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support0:2.6.2-4.el8_6.4 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Telecommunications Update Service0:2.6.2-4.el8_6.4 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Update Services for SAP Solutions0:2.6.2-4.el8_6.4 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service0:2.8.2-4.el8_8.3 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions0:2.8.2-4.el8_8.3 < *unaffected
Red HatRed Hat Enterprise Linux 90:2.9.7-4.el9_7.1 < *unaffected
Red HatRed Hat Enterprise Linux 90:2.9.7-4.el9_7.1 < *unaffected
Red HatRed Hat Enterprise Linux 9.0 Update Services for SAP Solutions0:2.6.2-4.el9_0.4 < *unaffected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutions0:2.8.2-5.el9_2.6 < *unaffected
Red HatRed Hat Enterprise Linux 9.4 Extended Update Support0:2.9.4-6.el9_4.4 < *unaffected
Red HatRed Hat Enterprise Linux 9.6 Extended Update Support0:2.9.6-4.el9_6.3 < *unaffected
Red HatRed Hat OpenShift Container Platform 4.12412.86.202601061735-0 < *unaffected
Red HatRed Hat OpenShift Container Platform 4.13413.92.202601130113-0 < *unaffected
Red HatRed Hat OpenShift Container Platform 4.14414.92.202511122212-0 < *unaffected
Red HatRed Hat OpenShift Container Platform 4.15415.92.202512100122-0 < *unaffected
Red HatRed Hat OpenShift Container Platform 4.16416.94.202512030118-0 < *unaffected
Red HatRed Hat OpenShift Container Platform 4.17417.94.202511260612-0 < *unaffected
Red HatRed Hat OpenShift Container Platform 4.18418.94.202511170715-0 < *unaffected
Red HatRed Hat OpenShift Container Platform 4.194.19.9.6.202511252219-0 < *unaffected
Red HatRed Hat OpenShift Container Platform 4.204.20.9.6.202511252309-0 < *unaffected
Red HatRed Hat Ceph Storage 7sha256:6b79ed10423d954d21dd24c9cb1cf507f6e02c2942ace7fa30cf7af2ffaeb631 < *unaffected
Red HatRed Hat Ceph Storage 8sha256:04a48d31f7336e0d5958eed1ddb1a117148f791baccef4e6e08943181e6794c8 < *unaffected

Weaknesses

  • CWE-269: Improper Privilege Management

Workarounds

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.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References