LiveZilla 5.1.1.0 Stored XSS in operator clients

Author: Jakub Zoczek [[email protected]]
CVE Reference: CVE-2013-7003
Product: LiveZilla
Vendor: LiveZilla GmbH [http://livezilla.net]
Affected version: 5.1.1.0
Severity: Medium
CVSSv2 Score: 4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Status: Fixed

0x01 Background

LiveZilla, the widely-used and trusted Live Help and Live Support System.

0x02 Description

LiveZilla in version 5.1.1.0 is prone to multiple Stored Cross-Site Scripting issues in Webbased Operator Client and LiveZilla Client. Attacker can put payloads in fields like "full name" , "company", or create crafted filename to exploit this vulnerability.

0x03 Proof of Concepts

Name and Surname variant:

My name is Jakub and this is looong username <img src="a" onerror="alert(document.cookie)">h

Operator who will try to chat with attacker with this name will get javascript code executed.

Screenshots:

http://postimg.org/image/orvwl36on/
http://postimg.org/image/uhh72ij6f/
http://postimg.org/image/6f0d7n2jb/
http://postimg.org/image/6hk8uh66v/
http://postimg.org/image/7z5p61axj/

Uploaded filename variant:

If attacker (while chatting) will try to upload specially crafted file with name: c"><img src="a" onerror="alert(document.cookie)">hh.jpg - then operator would get javascript code execution without any interaction.

Screenshots:

http://postimg.org/image/kp9xj4ivr/
http://postimg.org/image/pqhbkhqc7/
http://postimg.org/image/7c6sgie1j/

0x04 Fix

Vulnerabilities was fixed in LiveZilla 5.1.2.0 version.

0x05 Timeline

21.11.2013 - Vendor notified
01.12.2013 - Ping
02.12.2013 - Vendor responded with information about planing fix
06.12.2013 - Fixed version released
10.12.2013 - Public Disclosure