SB2021092103 - Multiple vulnerabilities in Moodle

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Main Vulnerability Database SB2021092103

SB2021092103 - Multiple vulnerabilities in Moodle

Published: September 21, 2021

Security Bulletin ID SB2021092103
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 5
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 80% Low 20%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 5 vulnerabilities.


1) Session Fixation (CVE-ID: CVE-2021-40691)

CWE-ID: CWE-384 - Session Fixation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


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)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


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)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


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)

CWE-ID: CWE-287 - Improper Authentication

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green


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)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


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.

References