CVE-2025-11561

Name	CVE-2025-11561
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1117935

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
sssd (PTS)	bullseye	2.4.1-2	vulnerable
	bullseye (security)	2.4.1-2+deb11u1	vulnerable
	bookworm	2.8.2-4+deb12u1	vulnerable
	forky, sid, trixie	2.10.1-2	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
sssd	source	(unstable)	(unfixed)			1117935

Notes

[trixie] - sssd <no-dsa> (Minor issue)
[bookworm] - sssd <no-dsa> (Minor issue)
[bullseye] - sssd <postponed> (Minor issue)
https://bugzilla.redhat.com/show_bug.cgi?id=2402727
https://blog.async.sg/kerberos-ldr
https://github.com/SSSD/sssd/issues/8021
https://github.com/SSSD/sssd/commit/9939c39d1949fad48af2f0b43c788bad0809e310 (master)
https://github.com/SSSD/sssd/commit/9edd2b3bb9bcff132969fadd402b4891b2ddb9e3 (sssd-2-10)
https://github.com/SSSD/sssd/commit/a0336f4cd69c25b3d501a3d361d3d286c00da4d2 (sssd-2-8)