Bug 2497650

Summary:	CVE-2026-14476 sssd: sssd: GPO cache path traversal via unsanitized gPCFileSysPath allows Kerberos authentication bypass [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Samuele Negrini <snegrini>
Component:	sssd	Assignee:	Alexey Tikhonov <atikhono>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	abokovoy, atikhono, lslebodn, pbrezina, sbose, ssorce, sssd-maintainers
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["0c66f03b-252f-48f9-9e00-10588a9a2e5b"]}
Fixed In Version:	sssd-2.13.1-3.fc45	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-07-10 13:06:40 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2496581

Description Samuele Negrini 2026-07-07 09:09:23 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

The ad_gpo_extract_smb_components() function in SSSD's AD GPO provider converts backslashes to forward slashes in the gPCFileSysPath LDAP attribute but does not sanitize .. path components. A differential between libsmbclient's path clamping (resolves .. at the share root) and the kernel's path resolution (resolves .. fully) allows an attacker with AD GPO management access to write files outside the GPO cache directory as root.

On SELinux-enforcing systems (the default on RHEL), the traversal can target /var/lib/sss/pubconf/krb5.include.d/ (labeled sssd_public_t), enabling Kerberos KDC redirection and authentication bypass. On SELinux-permissive or disabled systems, arbitrary file write as root is possible.

Comment 1 Alexey Tikhonov 2026-07-07 09:12:31 UTC

Upstream PR: https://github.com/SSSD/sssd/pull/8896

Comment 2 Alexey Tikhonov 2026-07-08 06:58:44 UTC

https://github.com/SSSD/sssd/commit/ba207eab76ff5253662a763b9b6e9ea42f03d31b

Comment 3 Fedora Update System 2026-07-09 17:58:54 UTC

FEDORA-2026-5acfb0243b (CVE-2026-12610 CVE-2026-14474 CVE-2026-14476) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-5acfb0243b

Comment 4 Fedora Update System 2026-07-09 18:55:24 UTC

FEDORA-2026-9ab663dcd4 (CVE-2026-12610 CVE-2026-14474 CVE-2026-14476) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-9ab663dcd4

Comment 5 Fedora Update System 2026-07-10 01:27:42 UTC

FEDORA-2026-5acfb0243b has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-5acfb0243b`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-5acfb0243b

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 6 Fedora Update System 2026-07-10 01:44:30 UTC

FEDORA-2026-9ab663dcd4 has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-9ab663dcd4`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-9ab663dcd4

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 7 Fedora Update System 2026-07-10 11:16:20 UTC

FEDORA-2026-8fad0036a5 (sssd-2.13.1-3.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-8fad0036a5

Comment 8 Fedora Update System 2026-07-10 13:06:40 UTC

FEDORA-2026-8fad0036a5 (sssd-2.13.1-3.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 9 Fedora Update System 2026-07-11 01:12:06 UTC

FEDORA-2026-5acfb0243b (CVE-2026-12610 CVE-2026-14474 CVE-2026-14476) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 10 Fedora Update System 2026-07-25 01:17:38 UTC

FEDORA-2026-9ab663dcd4 (CVE-2026-12610 CVE-2026-14474 CVE-2026-14476) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.