SB2021092103 - Multiple vulnerabilities in Moodle
Published: September 21, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 secuirty vulnerabilities.
1) Session Fixation (CVE-ID: CVE-2021-40691)
The vulnerability allows a remote attacker to hijack the target user's session.
The weakness exists due to a session hijack risk in the Shibboleth authentication plugin. A remote attacker can obtain sensitive information on the system.
2) Information disclosure (CVE-ID: CVE-2021-40695)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the application. A remote authenticated attacker can view their quiz grade before it had been released, using a quiz web service.
3) Information disclosure (CVE-ID: CVE-2021-40694)
The vulnerability allows a remote user to gain access to potentially sensitive information.
The vulnerability exists due to insufficient escaping of the LaTeX preamble. A remote administrator can read files available to the HTTP server system account.
4) Improper Authentication (CVE-ID: CVE-2021-40693)
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to a type juggling issue in the external database authentication functionality. A remote attacker can bypass authentication process and gain unauthorized access to the application.
5) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2021-40692)
The vulnerability allows a remote attacker to escalate privileges on the system.
The vulnerability exists due to insufficient capability checks. A remote authenticated attacker can download users outside of their courses.
Remediation
Install update from vendor's website.