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 (attack range: remote)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
sssd (PTS)jessie1.11.7-3fixed
jessie (security)1.11.7-3+deb8u2fixed
stretch1.15.0-3vulnerable
buster, sid1.16.3-3.1vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
sssdsource(unstable)(unfixed)medium
sssdsourcejessie(not affected)

Notes

[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
check, Bugzilla entry does not provide details

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