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Description

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.

PUBLISHED Reserved 2025-10-09 | Published 2025-10-09 | Updated 2025-10-10 | Assigner redhat




HIGH: 8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem types

Improper Privilege Management

Product status

Default status
affected

Default status
unknown

Default status
affected

Default status
affected

Default status
affected

Default status
affected

Timeline

2025-10-09:Reported to Red Hat.
2025-10-09:Made public.

Credits

Red Hat would like to thank Zavier Lee for reporting this issue.

References

access.redhat.com/security/cve/CVE-2025-11561 vdb-entry

blog.async.sg/kerberos-ldr

bugzilla.redhat.com/show_bug.cgi?id=2402727 (RHBZ#2402727) issue-tracking

cve.org (CVE-2025-11561)

nvd.nist.gov (CVE-2025-11561)

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