| Name | CVE-2018-16838 |
| Description | A flaw was found in sssd Group Policy Objects implementation. When the GPO is not readable by SSSD due to a too strict permission settings on the server side, SSSD will allow all authenticated users to login instead of denying access. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-3436-1 |
| Debian Bugs | 931432 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| sssd (PTS) | jessie, jessie (lts) | 1.11.7-3+deb8u2 | fixed |
| stretch (security), stretch (lts), stretch | 1.15.0-3+deb9u2 | vulnerable |
| buster (security), buster, buster (lts) | 1.16.3-3.2+deb10u2 | fixed |
| bullseye | 2.4.1-2 | fixed |
| bookworm | 2.8.2-4 | fixed |
| sid | 2.9.5-3 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| sssd | source | wheezy | (unfixed) | end-of-life | | |
| sssd | source | jessie | (not affected) | | | |
| sssd | source | buster | 1.16.3-3.2+deb10u1 | | DLA-3436-1 | |
| sssd | source | (unstable) | 2.2.0-1 | | | 931432 |
Notes
[stretch] - sssd <no-dsa> (Minor issue)
[jessie] - sssd <not-affected> (GPO based access control introduced later)
https://bugzilla.redhat.com/show_bug.cgi?id=1640820
GPO based access control introduced in https://github.com/SSSD/sssd/commit/60cab26b12
seems to presuppose configuration mistake: if sssd is not given enough permissions
to read GPO, access is systematically granted instead of denied
https://pagure.io/SSSD/sssd/issue/3867
https://pagure.io/SSSD/sssd/c/ad058011b6b75b15c674be46a3ae9b3cc5228175 (sssd-1-16)