Arduino Create Agent vulnerable to Reflected Cross-Site Scripting

Vulnerability Description

The Arduino Create Agent allows users to use the Arduino Create applications to upload code to any USB connected Arduino board directly from the browser. A vulnerability in versions prior to 1.3.6 affects the endpoint `/certificate.crt` and the way the web interface of the ArduinoCreateAgent handles custom error messages. An attacker that is able to persuade a victim into clicking on a malicious link can perform a Reflected Cross-Site Scripting attack on the web interface of the create agent, which would allow the attacker to execute arbitrary browser client side code. Version 1.3.6 contains a fix for the issue.

References

• https://github.com/arduino/arduino-create-agent/security/advisories/GHSA-j5hc-wx84-844h
• https://github.com/arduino/arduino-create-agent/commit/9a0e582bb8a1ff8e70d202943ddef8625ccefcc8