Ubuntu 18.04 LTS / 20.04 LTS / 21.04 : SSSD vulnerabilities (USN-5067-1)

medium Nessus Plugin ID 153144
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The remote Ubuntu host is missing one or more security updates.


The remote Ubuntu 18.04 LTS / 20.04 LTS / 21.04 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5067-1 advisory.

- 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. (CVE-2018-16838)

- The UNIX pipe which sudo uses to contact SSSD and read the available sudo rules from SSSD has too wide permissions, which means that anyone who can send a message using the same raw protocol that sudo and SSSD use can read the sudo rules available for any user. This affects versions of SSSD before 1.16.3.

- 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. (CVE-2019-3811)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Update the affected packages.

See Also


Plugin Details

Severity: Medium

ID: 153144

File Name: ubuntu_USN-5067-1.nasl

Version: 1.4

Type: local

Agent: unix

Published: 9/8/2021

Updated: 9/24/2021

Dependencies: ssh_get_info.nasl

Risk Information

CVSS Score Source: CVE-2018-16838


Risk Factor: High

Score: 7.4


Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.1

Vector: AV:N/AC:L/Au:S/C:P/I:P/A:N

Temporal Vector: E:U/RL:OF/RC:C


Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4.7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:21.04, p-cpe:/a:canonical:ubuntu_linux:libipa-hbac-dev, p-cpe:/a:canonical:ubuntu_linux:libipa-hbac0, p-cpe:/a:canonical:ubuntu_linux:libnss-sss, p-cpe:/a:canonical:ubuntu_linux:libpam-sss, p-cpe:/a:canonical:ubuntu_linux:libsss-certmap-dev, p-cpe:/a:canonical:ubuntu_linux:libsss-certmap0, p-cpe:/a:canonical:ubuntu_linux:libsss-idmap-dev, p-cpe:/a:canonical:ubuntu_linux:libsss-idmap0, p-cpe:/a:canonical:ubuntu_linux:libsss-nss-idmap-dev, p-cpe:/a:canonical:ubuntu_linux:libsss-nss-idmap0, p-cpe:/a:canonical:ubuntu_linux:libsss-simpleifp-dev, p-cpe:/a:canonical:ubuntu_linux:libsss-simpleifp0, p-cpe:/a:canonical:ubuntu_linux:libsss-sudo, p-cpe:/a:canonical:ubuntu_linux:libwbclient-sssd, p-cpe:/a:canonical:ubuntu_linux:libwbclient-sssd-dev, p-cpe:/a:canonical:ubuntu_linux:python-libipa-hbac, p-cpe:/a:canonical:ubuntu_linux:python-libsss-nss-idmap, p-cpe:/a:canonical:ubuntu_linux:python-sss, p-cpe:/a:canonical:ubuntu_linux:python3-libipa-hbac, p-cpe:/a:canonical:ubuntu_linux:python3-libsss-nss-idmap, p-cpe:/a:canonical:ubuntu_linux:python3-sss, p-cpe:/a:canonical:ubuntu_linux:sssd, p-cpe:/a:canonical:ubuntu_linux:sssd-ad, p-cpe:/a:canonical:ubuntu_linux:sssd-ad-common, p-cpe:/a:canonical:ubuntu_linux:sssd-common, p-cpe:/a:canonical:ubuntu_linux:sssd-dbus, p-cpe:/a:canonical:ubuntu_linux:sssd-ipa, p-cpe:/a:canonical:ubuntu_linux:sssd-kcm, p-cpe:/a:canonical:ubuntu_linux:sssd-krb5, p-cpe:/a:canonical:ubuntu_linux:sssd-krb5-common, p-cpe:/a:canonical:ubuntu_linux:sssd-ldap, p-cpe:/a:canonical:ubuntu_linux:sssd-proxy, p-cpe:/a:canonical:ubuntu_linux:sssd-tools

Required KB Items: Host/cpu, Host/Ubuntu, Host/Ubuntu/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 9/8/2021

Vulnerability Publication Date: 6/26/2018

Reference Information

CVE: CVE-2018-10852, CVE-2018-16838, CVE-2019-3811, CVE-2021-3621

USN: 5067-1