relatedcode/Messenger 7bcd20b - Broken Access Control

Summary

Vulnerability

Description

Relatedcode/Messenger version 7bcd20b allows an authenticated external attacker to access existing chats in the workspaces of any user of the application. This is possible because the application does not validate permissions correctly.

Vulnerability

The application does not validate the application permissions correctly. Thanks to this we can access confidential information of any user registered on the server. Here we will see how an attacker manages to access the internal chats of the victim user:

Exploitation

To exploit this broken access control, one must first exploit another vulnerability present in the application. This vulnerability involves the disclosure of sensitive information.

Thanks to it I was able to gather the necessary data to be able to obtain the internal chat logs of other users of the application:

Impact

An authenticated remote attacker can access internal chat logs of arbitrary users of the application.

Our security policy

We have reserved the CVE-2022-41708 to refer to this issue from now on.

• https://fluidattacks.com/advisories/policy/

System Information

• Version: relatedcode/Messenger 7bcd20b

• Operating System: GNU/Linux

Mitigation

There is currently no patch available for this vulnerability.

Credits

The vulnerability was discovered by Carlos Bello from Fluid Attacks' Offensive Team.

References

Vendor page https://github.com/relatedcode/Messenger

Timeline