Plane 0.7.1 - Insecure file upload

Description

Plane version 0.7.1-dev allows an attacker to change the avatar of his profile, which allows uploading files with HTML extension that interprets both HTML and JavaScript.

Vulnerability

The vulnerability arises when uploading files other than JPG and PNG which it says is allowed, since files of all file extensions and sizes can be uploaded and stored without validation. Then an attacker can upload an HTML file as a profile avatar, and it may contain malicious JavaScript code stored with which they can steal session cookies from users and the administrator.

Exploit

Evidence of exploitation

Log in with any user and go to the menu and go to "Settings -> General -> Logo (Upload)" we create a file with HTML extension which inside sends in a request to an attacker's server the user's cookies.

Once the attacker obtains the cookies he can use them to log into the user's account and as seen in this example gain full control of the account to delete, create, view.

Our security policy

We have reserved the CVE-2023-30791 to refer to this issue from now on. Disclosure policy

System Information

• Version: Plane 0.7.1

• Operating System: GNU/Linux

Mitigation

There is currently no patch available for this vulnerability.

References

• Vendor page https://github.com/makeplane/plane