Sssd: sssd default kerberos configuration allows privilege escalation on ad-joined linux systems

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.

Timeline

1. Oct 9, 2025, 1:37 PM UTCCVE published
2. Oct 10, 2025, 3:55 AM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Aug 31, 2026, 4:51 PM UTCRecord last updated

Affected versions

• sssd

  through 2.11.1

• sssd

  Version range not reported

• sssd

  Version range not reported

• sssd

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• sssd

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• sssd

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• sssd

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• sssd

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• sssd

  Version range not reported

• sssd

  Version range not reported

• sssd

  Version range not reported

• sssd

  Version range not reported

• sssd

  Version range not reported

• sssd

  Version range not reported

• sssd

  Version range not reported

• sssd

  Version range not reported

• sssd

  Version range not reported

• sssd

  Version range not reported

• sssd

  Version range not reported

• sssd

  Version range not reported

• rhcos

  Version range not reported

• rhcos

  Version range not reported

• rhcos

  Version range not reported

• rhcos

  Version range not reported

• rhcos

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• rhcos

  Version range not reported

• rhcos

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• rhcos

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• rhcos

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• rhceph/rhceph-7-rhel9

  Version range not reported

• rhceph/rhceph-8-rhel9

  Version range not reported

• sssd

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

References 25