usd-2019-0051 | Dolibarr ERP/CRM ver. 3.0 – 10.0.3

Advisory ID: usd-2019-0051
CVE Number: CVE-2019-19209
Affected Product: Dolibarr ERP/CRM
Affected Version: 3.0 – 10.0.3
Vulnerability Type: Reflected XSS, SQL injection
Security Risk: High
Vendor URL: https://www.dolibarr.org/
Vendor Status: Fixed (not verified)

Description

Multiple vulnerabilites due to insufficent filtering of the HTTP Header „Accept-Language“.
The unfiltered, but modified, variable „$langs->defaultlang“ gets used in multiple locations. This leads to XSS and SQL injection.

An incomplete list of files using this variable:

XSS
– /dolibarr/htdocs/admin/system/dolibarr.php (directly accessing $_SERVER[„HTTP_ACCEPT_LANGUAGE“])
– /dolibarr/htdocs/admin/mails_templates.php
– /dolibarr/htdocs/main.inc.php

SQL Injection
– /dolibarr/htdocs/admin/mails_templates.php
No exploit found to exfiltrate data due to the preprocessing of the value

Proof of Concept (PoC)

XSS: Submit a GET request to the given URL and intercept the request. Change the Accept-Language header as stated below and forward the request. A popup should occur displaying the cookie.

usd security advisories usd 2019 0051 XSS 
<html>

SQL injection: Submit a GET request to the given URL and intercept the request. Change the Accept-Language header as stated below and forward the request. An error message should be displayed revealing the query.

usd security advisories usd 2019 0051 SQLi

Fix

Validate the HTTP Header Accept-Language and ignore invalid values. Furthermore filter the value, according to its usage.

Timeline

  • 2019-09-06 Vulnerability discovered by Daniel Hoffmann
  • 2019-09-11 First contact with vendor
  • 2019-10-30 Vendor released version 10.0.3 which fixes the vulnerability (not verified)
  • 2020-02-05 Security advisory released

Credits

This security vulnerability was discovered by Daniel Hoffmann of usd AG.