For more information see the SQL Injection Prevention Cheat Sheet.īut also LDAP, SOAP, XPath and REST based queries can be susceptible to injection attacks allowing for data retrieval or control bypass. The most famous form of injection is SQL Injection where an attacker can modify existing database queries. There are several forms of injection targeting different technologies including SQL queries, LDAP queries, XPath queries and OS commands. A3: Productive Closed Source Application ¶Ī productive application which cannot or only with difficulty be modified. A Model-View-Controller (MVC) type application is just one example of having a easily accessible application architecture. A2: Productive Open Source Application ¶Īn already productive application, which can be easily adapted. A1: New Application ¶Ī new web application in the design phase, or in early stage development. Those 3 types are needed to identify the actions which need to take place in order to prevent/fix injection flaws. Three classes of applications can usually be seen within a company. But if the source code is not available or it is simply uneconomical to fix legacy software only virtual patching makes sense. It is always the best way to fix the problem in source code itself, or even redesign some parts of the applications. Scanners and fuzzers can help attackers find them.ĭepending on the accessibility different actions must be taken in order to fix them. Injection flaws are easy to discover when examining code, but more difficult via testing. Injection flaws are very prevalent, particularly in legacy code, often found in SQL queries, LDAP queries, XPath queries, OS commands, program arguments, etc. Injection flaws occur when an application sends untrusted data to an interpreter. Open source applications give at least the opportunity to fix problems, but closed source applications need a different approach to injection flaws. Only the minority of all applications within a company/enterprise are developed in house, where as most applications are from external sources. Injection attacks, especially SQL Injection, are unfortunately very common.Īpplication accessibility is a very important factor in protection and prevention of injection flaws. This article is focused on providing clear, simple, actionable guidance for preventing the entire category of Injection flaws in your applications. Injection Prevention Cheat Sheet ¶ Introduction ¶ Insecure Direct Object Reference Prevention Rule #1 (Perform proper input validation) Defense Option 1: Prepared Statements (with Parameterized Queries)ĭefense Option 3: Allow-List Input Validationĭefense Option 4: Escaping All User-Supplied InputĮscape all variables using the right LDAP encoding function
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