Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-07-07T09:00:00 sssd: sssd: GPO cache path traversal via unsanitized gPCFileSysPath allows Kerberos authentication bypass 8.0 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H CWE-23

A path traversal flaw was found in SSSD's AD GPO provider. The ad_gpo_extract_smb_components() function does not sanitize .. sequences in the gPCFileSysPath LDAP attribute, allowing an attacker with AD GPO management access to write files outside the GPO cache directory as root. On default RHEL configurations with SELinux enforcing, this can be used to inject Kerberos configuration leading to authentication bypass.

A path traversal flaw was found in SSSD's AD GPO provider. The ad_gpo_extract_smb_components() function does not sanitize .. sequences in the gPCFileSysPath LDAP attribute, allowing an attacker with AD GPO management access to write files outside the GPO cache directory as root. On default RHEL configurations with SELinux enforcing, this can be used to inject Kerberos configuration leading to authentication bypass.

Red Hat has rated this as Moderate because exploitation requires high privileges (AD GPO management access) and on default RHEL configurations with SELinux enforcing, the realistic impact is limited to Kerberos authentication bypass via krb5 configuration injection. SELinux blocks writes to most security-critical paths such as /etc/cron.d/. This issue was discovered by Ian Murphy (Red Hat). Set ad_gpo_access_control = disabled in /etc/sssd/sssd.conf to disable GPO fetching entirely. Note that this removes GPO-based login policy enforcement. Red Hat Enterprise Linux 10 2026-07-20T00:00:00Z RHSA-2026:41937 sssd-0:2.12.0-3.el10_2.1 Red Hat Enterprise Linux 9 2026-07-20T00:00:00Z RHSA-2026:42122 sssd-0:2.9.8-4.el9_8.1 Red Hat Enterprise Linux 9 2026-07-20T00:00:00Z RHSA-2026:42122 sssd-0:2.9.8-4.el9_8.1 Red Hat Enterprise Linux 6 Out of support scope sssd Red Hat Enterprise Linux 7 Affected sssd Red Hat Enterprise Linux 8 Affected sssd Red Hat OpenShift Container Platform 4 Affected rhcos https://www.cve.org/CVERecord?id=CVE-2026-14476 https://nvd.nist.gov/vuln/detail/CVE-2026-14476