CVE-2018-16838

NameCVE-2018-16838
DescriptionA 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium
Debian Bugs931432

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
sssd (PTS)stretch1.15.0-3+deb9u1vulnerable
stretch (security)1.15.0-3+deb9u2vulnerable
buster1.16.3-3.2vulnerable
bullseye2.4.1-2fixed
bookworm, sid2.5.2-4fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
sssdsourcejessie(not affected)
sssdsource(unstable)2.2.0-1931432

Notes

[buster] - sssd <no-dsa> (Minor issue)
[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

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