Teedy v1.11 - Stored cross-site scripting (XSS)

Description

Teedy v1.11 has a vulnerability in its text editor that allows events to be executed in HTML tags that an attacker could manipulate. Thanks to this, it is possible to execute malicious JavaScript in the webapp.

Vulnerability

A Stored cross-site scripting (XSS) vulnerability was identified in Teedy v1.11, which can allow an attacker to steal data such as session cookies or even steal private documents from other users. This vulnerability can be exploited in case a user wants to modify the malicious document created by the attacker.

Exploitation

To exploit this vulnerability go to Home -> Add a document -> Edit -> Save -> Edit the created document (this is where the XSS is executed).

It should be clarified that the attacker needs access to the platform in order to exploit this vulnerability. This would be an example of a functional payload:

<img src=x onerror=alert(document.cookie)>

This payload only retrieves the user's cookie and displays it on the screen, but an attacker could send it to a remote server to steal another user's session.

Our security policy

We have reserved the ID CVE-2023-4892 to refer to this issue from now on. Disclosure policy

System Information

• Version: Teedy v1.11 (2023-03-12)

• Operating System: MacOS

Mitigation

An updated version of Teedy is available at the vendor page.

References

• Vendor page https://teedy.io