SB2021090837 - Ubuntu update for sssd
Published: September 8, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Information disclosure (CVE-ID: CVE-2018-10852)
The vulnerability allows a remote attacker to obtain potentially sensitive information.
The vulnerability exists due to too wide permissions in the UNIX pipe which sudo uses to contact SSSD and read the available sudo rules from SSSD. A remote attacker can send a message using the same raw protocol that sudo and SSSD use can read the sudo rules available for any user.
2) Security restrictions bypass (CVE-ID: CVE-2018-16838)
The vulnerability allows a remote authenticated attacker to bypass security restrictions on the system.
The vulnerability exists due to a flaw 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. A remote attacker can bypass security restrictions.
3) Improper access control (CVE-ID: CVE-2019-3811)
The vulnerability allows an adjacent authenticated attacker to bypass security restrictions.
The vulnerability exists due to the return of '/' (the root directory) instead of '' (the empty string / no home directory) if a user was configured with no home directory set. An adjacent attacker can bypass services that restrict the user's filesystem access to within their home directory through chroot().
4) Command Injection (CVE-ID: CVE-2021-3621)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to improper input validation in the sssctl command within the logs-fetch and cache-expire subcommands. An attacker can trick the root user into running a specially crafted sssctl command, such as via sudo, and execute arbitrary code with root privileges.
Remediation
Install update from vendor's website.