4.12.1 Test Business Logic Data Validation (OTG-BUSLOGIC-001)
The application must ensure that only valid data can be entered at the front end as well as directly to the server side. Only verifying data on the front end may leave applications vulnerable to server injections through proxies.
The front end and the backend of the application should be verifying and validating that the data it has, is using and is passing along is valid.
• Perform front-end GUI Functional Valid testing to ensure that the only acceptable values are accepted.
• Using an intercepting proxy observe the HTTP POST/GET looking for the place that variables such as cost and quality are passed.
• Once variables are found start interrogating the field with negative and extra-large values testing that the server functions properly and does not accept them.
OWASP Zed Attack Proxy (ZAP) - https://www.owasp.org/index.php/OWASP_Zed_Attack_Proxy_Project
ZAP is an easy to use integrated penetration testing tool for finding vulnerabilities in web applications. It is designed to be used by people with a wide range of security experience and as such is ideal for developers and functional testers who are new to penetration testing. ZAP provides automated scanners as well as a set of tools that allow you to find security vulnerabilities manually.
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