Improper input validation: Difference between revisions

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'''Improper input validation'''<ref name=":0">{{cite web |work=[[Common Weakness Enumeration]] |publisher=[[MITRE]] |title=CWE-20: Improper Input Validation |url=http://cwe.mitre.org/data/definitions/20.html |date=December 13, 2010 |accessdate=February 22, 2011}}</ref> or '''unchecked user input''' is a type of [[vulnerability (computing)|vulnerability]] in [[computer software]] that may be used for [[security exploit]]s.<ref name=hacking>{{cite book|title=Hacking: the art of exploitation|series=No Starch Press Series|publisher=Safari Books Online|first=Jon|last=Erickson|edition=2, illustrated|year=2008|ISBN= 978-1-59327-144-2}}</ref> This vulnerability is caused when "[t]he product does not validate or incorrectly validates input that can affect the control flow or data flow of a program."<ref name=":0" />

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{{Unreferenced|date=December 2009}}

{{Notability|date=March 2008}}

'''String exploits''' are [[security exploit]]s involving handling of [[String (computer science)|string]] data in computer software.

Examples include:

* [[Format string attack]] - unchecked <code>[[printf|*printf]]</code> format strings are dangerous<!-- If exception handling is not involved -->

* [[Buffer overflow]] - Buffer overflows often occurs in unsafe string functions

* [[Cross-site scripting]] - unsafe output of input strings

* [[Directory traversal]] - concatenating strings to create a filename is not a good idea

* [[Null byte injection]]

* [[SQL injection]] - concatenating strings to create a SQL statement is not a good idea

* [[SQL injection]]

* [[Uncontrolled format string]]

== References ==

{{reflist}}

{{security-software-stub}}

{{DEFAULTSORT:String Exploits}}

[[Category:Computer security exploits]]