CVE-2018-16838

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.

The updated packages fix a security vulnerability:

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)

This update for sssd fixes the following issues:

Security issue fixed:

• CVE-2018-16838: Fixed an authentication bypass related to the Group Policy Objects implementation (bsc#1124194).

Non-security issues fixed:

• Allow defaults sudoRole without sudoUser attribute (bsc#1135247)
• Missing GPOs directory could have led to login problems (bsc#1132879)
• Fix a crash by adding a netgroup counter to struct nss_enum_index (bsc#1132657)

This update was imported from the SUSE:SLE-15:Update update project.

These are all security issues fixed in the libipa_hbac-devel-2.9.3-2.1 package on the GA media of openSUSE Tumbleweed.

This update for sssd fixes the following issues:

Security issue fixed:

• CVE-2018-16838: Fixed an authentication bypass related to the Group Policy Objects implementation (bsc#1124194).

Non-security issues fixed:

• Allow defaults sudoRole without sudoUser attribute (bsc#1135247)
• Missing GPOs directory could have led to login problems (bsc#1132879)
• Fix a crash by adding a netgroup counter to struct nss_enum_index (bsc#1132657)

This update for sssd fixes the following issues:

Security issue fixed:

• CVE-2018-16838: Fixed an authentication bypass related to the Group Policy Objects implementation (bsc#1124194).

Non-security issue fixed:

• Create directory to download and cache GPOs (bsc#1132879)

This update for sssd fixes the following issues:

Security issue fixed:

• CVE-2018-16838: Fixed an authentication bypass related to the Group Policy Objects implementation (bsc#1124194)

Non-security issues fixed:

• Missing GPOs directory could have led to login problems (bsc#1132879)
• Fix a crash by adding a netgroup counter to struct nss_enum_index (bsc#1132657)
• Allow defaults sudoRole without sudoUser attribute (bsc#1135247)

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)