SB2021111615 - Multiple vulnerabilities in Moodle 

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Main Vulnerability Database SB2021111615

SB2021111615 - Multiple vulnerabilities in Moodle

Published: November 16, 2021

Security Bulletin ID SB2021111615
Severity
High
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 25% Medium 25% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 secuirty vulnerabilities.


1) Cross-site scripting (CVE-ID: CVE-2021-43558)

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in filetype admin tool. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.


2) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2021-43560)

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to insecure direct object reference (IDOR) issue. A remote attacker can fetch other users' calendar action events.


3) Code Injection (CVE-ID: CVE-2021-3943)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation when restoring malformed backup file . A remote attacker can send a specially crafted request and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


4) Cross-site request forgery (CVE-ID: CVE-2021-43559)

The vulnerability allows a remote attacker to perform cross-site request forgery attacks.

The vulnerability exists due to insufficient validation of the HTTP request origin in the "delete related badge" functionality. A remote attacker can trick the victim to visit a specially crafted web page and perform arbitrary actions on behalf of the victim on the vulnerable website.


Remediation

Install update from vendor's website.

References