A vulnerability was found in sssd. If a user was configured with no home directory set, sssd would return '/' (the root directory) instead of '' (the empty string / no home directory). This could impact services that restrict the user's filesystem access to within their home directory through chroot() etc. All versions before 2.1 are vulnerable.
https://lists.debian.org/debian-lts-announce/2023/05/msg00028.html
https://lists.debian.org/debian-lts-announce/2019/01/msg00011.html
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3811
https://access.redhat.com/errata/RHSA-2019:2177
http://www.securityfocus.com/bid/106644
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00045.html
http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00026.html