For more information on XSS filter evasion please see the this wiki page.Īllow list validation is appropriate for all input fields provided by the user. Plus, such filters frequently prevent authorized input, like O'Brian, where the ' character is fully legitimate. It is a common mistake to use block list validation in order to try to detect possibly dangerous characters and patterns like the apostrophe ' character, the string 1=1, or the tag, but this is a massively flawed approach as it is trivial for an attacker to bypass such filters. Regular expressions for any other structured data covering the whole input string (^.$) and not using "any character" wildcard (such as.Array of allowed values for small sets of string parameters (e.g.Minimum and maximum value range check for numerical parameters and dates, minimum and maximum length check for strings.Integer.parseInt() in Java, int() in Python) with strict exception handling Validation against JSON Schema and XML Schema (XSD) for input in these formats.Data type validators available natively in web application frameworks (such as Django Validators, Apache Commons Validators etc).Input validation can be implemented using any programming technique that allows effective enforcement of syntactic and semantic correctness, for example: Input validation can be used to detect unauthorized input before it is processed by the application. It is always recommended to prevent attacks as early as possible in the processing of the user's (attacker's) request. start date is before end date, price is within expected range). Semantic validation should enforce correctness of their values in the specific business context (e.g. Syntactic validation should enforce correct syntax of structured fields (e.g. Input validation should be applied on both syntactical and Semantic level.
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Input Validation should not be used as the primary method of preventing XSS, SQL Injection and other attacks which are covered in respective cheat sheets but can significantly contribute to reducing their impact if implemented properly.
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Input validation should happen as early as possible in the data flow, preferably as soon as the data is received from the external party.ĭata from all potentially untrusted sources should be subject to input validation, including not only Internet-facing web clients but also backend feeds over extranets, from suppliers, partners, vendors or regulators, each of which may be compromised on their own and start sending malformed data. Input validation is performed to ensure only properly formed data is entering the workflow in an information system, preventing malformed data from persisting in the database and triggering malfunction of various downstream components. This article is focused on providing clear, simple, actionable guidance for providing Input Validation security functionality in your applications. Input Validation Cheat Sheet ¶ Introduction ¶ Insecure Direct Object Reference Prevention Preventing XSS and Content Security Policy