Validating server side client php security

For example, if the parameter username is included in the GET or POST parameters twice, which one is honoured, if any.HTTP Verb Tampering is described in 4.8.3 Testing for HTTP Verb Tampering (OTG-INPVAL-003) and HTTP Parameter testing techniques are presented in 4.8.4 Testing for HTTP Parameter pollution (OTG-INPVAL-004) 4.8.5 SQL Injection (OTG-INPVAL-005) SQL injection testing checks if it is possible to inject data into the application so that it executes a user-controlled SQL query in the back-end database.But that's a waste of time (anything sent over the network takes time), and server resources.Server side validation is where all your important validation takes place.

This weakness leads to almost all of the major vulnerabilities in web applications, such as cross site scripting, SQL injection, interpreter injection, locale/Unicode attacks, file system attacks, and buffer overflows.Data from an external entity or client should never be trusted, since it can be arbitrarily tampered with by an attacker."All Input is Evil", says Michael Howard in his famous book "Writing Secure Code". Unfortunately, complex applications often have a large number of entry points, which makes it difficult for a developer to enforce this rule. This is the task of testing all the possible forms of input to understand if the application sufficiently validates input data before using it.In this case, testers use a SQL Injection against an ORM-generated data access object model.From the tester's point of view, this attack is virtually identical to a SQL Injection attack.

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The differences are that testers use the LDAP protocol instead of SQL and the target is an LDAP Server instead of a SQL Server.

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