CVE-2020-9758 Cross-site scripting in n/a

Critical 9.6 Published 9 Mar 2020 Updated 4 Aug 2024

Blind XSS in LiveZilla allows attackers to steal helpdesk credentials, leading to privilege escalation and full account takeover.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2020-9758?

CVE-2020-9758 is a critical cross-site scripting vulnerability in n/a, published on 9 Mar 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

An issue was discovered in chat.php in LiveZilla Live Chat 8.0.1.3 (Helpdesk). A blind JavaScript injection lies in the name parameter. Triggering this can fetch the username and passwords of the helpdesk employees in the URI. This leads to a privilege escalation, from unauthenticated to user-level access, leading to full account takeover. The attack fetches multiple credentials because they are stored in the database (stored XSS). This affects the mobile/chat URI via the lgn and psswrd parameters.

Weakness: CWE-79

Which versions are affected by CVE-2020-9758?

It affects 1 product.

Products include Livezilla Livezilla.

How do I fix CVE-2020-9758?

No fix has been published for CVE-2020-9758 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2020-9758 being exploited?

There is no known exploitation of CVE-2020-9758 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Sources

Also known as GHSA-m978-hcqw-jcmw.