SB2020102615 - Multiple vulnerabilities in Strapi

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Stored cross-site scripting (CVE-ID: CVE-2020-27666)

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 the wysiwyg editor's preview feature. A remote attacker can inject 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-2020-27665)

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

The vulnerability exists due to no admin::hasPermissions restriction for CTB (aka content-type-builder) routes, which leads to security restrictions bypass and privilege escalation.

3) Input validation error (CVE-ID: CVE-2020-27664)

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to unwanted /proxy?url= functionality in "admin/src/containers/InputModalStepperProvider/index.js".

Remediation

Install update from vendor's website.

References

• https://github.com/strapi/strapi/pull/8440
• https://github.com/strapi/strapi/releases/tag/v3.2.5
• https://github.com/strapi/strapi/pull/8439
• https://github.com/strapi/strapi/pull/8442