Front Accounting 2.3RC2 – Multiple Persistent Cross-Site Scripting Vulnerabilities
Advisory Name: Multiple Persistent Cross-Site Scripting (XSS) in Front Accounting Internal Cybsec Advisory Id: 2010-1001-Multiple Persistent XSSs in Front Accounting Vulnerability Class: Permanent Cross-Site Scripting (XSS) Release Date: 10/29/2010 Affected Applications: Front Accounting v2.3RC2; other versions may also be affected. Affected Platforms: Any running Front Accounting v2.3RC2 Local / Remote: Remote Severity: High - CVSS: 5.8 (AV:N/AC:M/Au:NR/C:N/I:P/A:P) Researcher: Juan Manuel Garcia Vendor Status: Acknowedged Reference to Vulnerability Disclosure Policy: http://www.cybsec.com/vulnerability_policy.pdf Vulnerability Description: Multiple Persistent Cross-Site vulnerabilities were found in Front Accounting v2.3RC2, because the application fails to sanitize the response before it is returned to the user. This can be exploited to execute arbitrary script and HTML code in a user's browser session. This may allow the attacker to steal the user's cookie and to launch further attacks. The parameter 'trans_no' in /purchasing/allocations/supplier_allocate.php is not properly sanitized. The parameter 'PONumber' in /purchasing/po_receive_items.php is not properly sanitized. Other parameters might also be affected. Proof of Concept: * The parameter 'trans_no' in the POST request has been set to: <script>alert(165602)</script> GET /purchasing/allocations/supplier_allocate.php?trans_type=1 HTTP/1.0 Cookie: FA4649d6f070639b67129c222b2094650d=2aa6f7cc954528a151a5f5d6c658f418 Accept: */* Accept-Language: en-US User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Win32) Host: next.frontaccounting.eu Referer: http://next.frontaccounting.eu/purchasing/allocations/supplier_allocation_main.php * The parameter 'PONumber' in the POST request has been set to: <script>alert(188214)</script> GET /purchasing/po_receive_items.php?PONumber= HTTP/1.0 Cookie: FA4649d6f070639b67129c222b2094650d=2aa6f7cc954528a151a5f5d6c658f418 Accept: */* Accept-Language: en-US User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Win32) Host: next.frontaccounting.eu Referer: http://next.frontaccounting.eu/purchasing/inquiry/po_search.php Impact: An affected user may unintentionally execute scripts or actions written by an attacker. In addition, an attacker may obtain authorization cookies that would allow him to gain unauthorized access to the application. Solution: Upgrade to FrontAccounting v2.3RC3 Vendor Response: 2010-10-12 - Vulnerability was identified 2010-10-13 - Vendor contacted 10/16/2010 Vendor confirmed vulnerability 10/19/2010 Vendor says that the bug will we fixed in FrontAccounting v2.3RC3 10/29/2010 Vulnerability was released Contact Information: For more information regarding the vulnerability feel free to contact the researcher at jmgarcia <at> cybsec <dot> com About CYBSEC S.A. Security Systems Since 1996, CYBSEC is engaged exclusively in rendering professional services specialized in Information Security. Their area of services covers Latin America, Spain and over 250 customers are a proof of their professional life. To keep objectivity, CYBSEC S.A. does not represent, neither sell, nor is associated with other software and/or hardware provider companies. Our services are strictly focused on Information Security, protecting our clients from emerging security threats, maintaining their IT deployments available, safe, and reliable. Beyond professional services, CYBSEC is continuously researching new defense and attack techniques and contributing with the security community with high quality information exchange. For more information, please visit www.cybsec.com (c) 2010 - CYBSEC S.A. Security Systems |