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LiveZilla 5.1.2.0 Multiple Stored XSS in webbased operator client



Author: Jakub Zoczek [zoczus@xxxxxxxxx]
CVE Reference: CVE-2013-7032
Product: LiveZilla 
Vendor: LiveZilla GmbH [http://livezilla.net]
Affected version: 5.1.2.0
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 5.1.2.0 is prone to multiple stored cross-site scripting vulnerabilities in Webbased Operator Client. Attacker is able to execute arbitrary javascript code in context of operator browser by providing xss payloads into unfiltered fields - details below.


0x03 Proof of Concept

- File Names - this issue is really similar to CVE-2013-7003. LiveZilla fixed it by escaping displayed file name when customer want send it to operator. Unfortunately it is unescaped after succesful upload.
- Also - after upload LiveZilla creates 'resources' with those files. Filenames are escaped properly there, but names of customers don't. We can use simple, widely-known XSS payloads to exploit this vulnerability.

0x04 Fix

Vulnerability was fixed in LiveZilla 5.1.2.1 version.

0x05 Timeline

08.12.2013 - Vendor notified
09.12.2013 - Vendor responded with informations about planned release 
10.12.2013 - Version 5.1.2.1 released
15.12.2013 - Public Disclosure