SB2023031410 - Multiple XSS vulnerabilities in Rails

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Cross-site scripting (CVE-ID: CVE-2023-28120)

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 ActiveSupport when calling a new bytesplice method on a SafeBuffer. 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) DOM-based cross-site scripting (CVE-ID: CVE-2023-23913)

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 rails-ujs, which leverages the Clipboard API to target HTML elements that are assigned the contenteditable attribute. 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.

Remediation

Install update from vendor's website.

References

• https://discuss.rubyonrails.org/t/cve-2023-28120-possible-xss-security-vulnerability-in-safebuffer-bytesplice/82469
• https://github.com/rails/rails/releases/tag/v7.0.4.3
• https://github.com/rails/rails/releases/tag/v6.1.7.3
• https://discuss.rubyonrails.org/t/cve-2023-23913-dom-based-cross-site-scripting-in-rails-ujs-for-contenteditable-html-elements/82468