Ubuntu Security Notice USN-5067-1
September 08, 2021
sssd vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 21.04
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
Summary:
Several security issues were fixed in sssd.
Software Description:
- sssd: System Security Services Daemon
Details:
Jakub Hrozek discovered that SSSD incorrectly handled file
permissions. A
local attacker could possibly use this issue to read the sudo
rules
available for any user. This issue only affected Ubuntu 18.04
LTS.
(CVE-2018-10852)
It was discovered that SSSD incorrectly handled Group Policy
Objects. When
SSSD is configured with too strict permissions causing the GPO to
not be
readable, SSSD will allow all authenticated users to login instead
of being
denied, contrary to expectations. This issue only affected Ubuntu
18.04
LTS. (CVE-2018-16838)
It was discovered that SSSD incorrectly handled users with no
home
directory set. When no home directory was set, SSSD would return
the root
directory instead of an empty string, possibly bypassing security
measures.
This issue only affected Ubuntu 18.04 LTS. (CVE-2019-3811)
Cedric Buissart discovered that SSSD incorrectly handled the
sssctl
command. In certain environments, a local user could use this issue
to
execute arbitrary commands and possibly escalate privileges.
(CVE-2021-3621)
Update instructions:
The problem can be corrected by updating your system to the
following
package versions:
Ubuntu 21.04:
sssd 2.4.0-1ubuntu6.1
Ubuntu 20.04 LTS:
sssd 2.2.3-3ubuntu0.7
Ubuntu 18.04 LTS:
sssd 1.16.1-1ubuntu1.8
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-5067-1
CVE-2018-10852, CVE-2018-16838, CVE-2019-3811, CVE-2021-3621
Package Information:
https://launchpad.net/ubuntu/+source/sssd/2.4.0-1ubuntu6.1
https://launchpad.net/ubuntu/+source/sssd/2.2.3-3ubuntu0.7
https://launchpad.net/ubuntu/+source/sssd/1.16.1-1ubuntu1.8
Read more https://packetstormsecurity.com/files/164082/USN-5067-1.txt