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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.3025 USN-5067-1: SSSD vulnerabilities 9 September 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: SSSD Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Root Compromise -- Existing Account Execute Arbitrary Code/Commands -- Existing Account Access Confidential Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-3621 CVE-2019-3811 CVE-2018-16838 CVE-2018-10852 Reference: ESB-2021.2991 ESB-2021.2953 ESB-2021.2951 ESB-2019.4156 ESB-2019.2104 ESB-2019.0122 ESB-2018.2065 Original Bulletin: https://ubuntu.com/security/notices/USN-5067-1 - --------------------------BEGIN INCLUDED TEXT-------------------- USN-5067-1: SSSD vulnerabilities 08 September 2021 Several security issues were fixed in sssd. Releases o Ubuntu 21.04 o Ubuntu 20.04 LTS o Ubuntu 18.04 LTS Packages o 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 o sssd - 2.4.0-1ubuntu6.1 Ubuntu 20.04 o sssd - 2.2.3-3ubuntu0.7 Ubuntu 18.04 o sssd - 1.16.1-1ubuntu1.8 In general, a standard system update will make all the necessary changes. References o CVE-2021-3621 o CVE-2018-10852 o CVE-2019-3811 o CVE-2018-16838 - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. 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