SB2019112128 - Multiple vulnerabilities in Moodle
Published: November 21, 2019
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 6 secuirty vulnerabilities.
1) Cross-site scripting (CVE-ID: CVE-2019-14884)
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 when displaying fatal error messages. 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) Improper Authorization (CVE-ID: CVE-2019-14883)
The vulnerability allows a remote attacker to gain unauthorized access to the application.
The vulnerability exists due to Moodle does not invalidate tokens after account expiration. A remote attacker that has a valid email media URL token and knows a file path of the attachment can access email attachments after account expiration.
3) Open redirect (CVE-ID: CVE-2019-14882)
The vulnerability allows a remote attacker to redirect victims to arbitrary URL.
The vulnerability exists due to improper sanitization of user-supplied data in Lesson edit page. A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain.
Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.
4) Reflected cross-site scripting (CVE-ID: CVE-2019-14881)
The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user email address. 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.
5) Improper Authentication (CVE-ID: CVE-2019-14880)
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to an error, related absence of email verification in OAuth 2 providers. A remote attacker can bypass authentication process and gain unauthorized access to the application.
6) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2019-14879)
The vulnerability allows a remote attacker to escalate privileges on the system.
The vulnerability exists due to Moodle does not properly revoke user privileges, when removing the cohort role. A remote authenticated user, whose privileges were revoked, still has access to associated capabilities.
Remediation
Install update from vendor's website.