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<title>Improper input validation</title>
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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Improper input validation</span></span>
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<div id="mw-content-text" class="mw-body-content mw-content-ltr" lang="en" dir="ltr"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><p><b>Improper input validation</b><sup id="cite_ref-:0_1-0" class="reference"><a href="#cite_note-:0-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> or <b>unchecked user input</b> is a type of <a href="Vulnerability_(computing)" class="mw-redirect" title="Vulnerability (computing)">vulnerability</a> in <a href="Computer_software" class="mw-redirect" title="Computer software">computer software</a> that may be used for <a href="Security_exploit" class="mw-redirect" title="Security exploit">security exploits</a>.<sup id="cite_ref-hacking_2-0" class="reference"><a href="#cite_note-hacking-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> 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."<sup id="cite_ref-:0_1-1" class="reference"><a href="#cite_note-:0-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p><p>Examples include:
</p>
<ul><li><a href="Buffer_overflow" title="Buffer overflow">Buffer overflow</a></li>
<li><a href="Cross-site_scripting" title="Cross-site scripting">Cross-site scripting</a></li>
<li><a href="Directory_traversal" class="mw-redirect" title="Directory traversal">Directory traversal</a></li>
<li><a href="Null_byte_injection" class="mw-redirect" title="Null byte injection">Null byte injection</a></li>
<li><a href="SQL_injection" title="SQL injection">SQL injection</a></li>
<li><a href="Uncontrolled_format_string" title="Uncontrolled format string">Uncontrolled format string</a></li></ul>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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<li id="cite_note-:0-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-:0_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:0_1-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">
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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://cwe.mitre.org/data/definitions/20.html">"CWE-20: Improper Input Validation"</a>. <i><a href="Common_Weakness_Enumeration" title="Common Weakness Enumeration">Common Weakness Enumeration</a></i>. <a href="MITRE" class="mw-redirect" title="MITRE">MITRE</a>. December 13, 2010<span class="reference-accessdate">. Retrieved <span class="nowrap">February 22,</span> 2011</span>.</cite></span>
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<li id="cite_note-hacking-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-hacking_2-0">^</a></b></span> <span class="reference-text"><cite id="CITEREFErickson2008" class="citation book cs1">Erickson, Jon (2008). <i>Hacking: the art of exploitation</i>. No Starch Press Series (2, illustrated&nbsp;ed.). Safari Books Online. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a>&nbsp;<bdi>978-1-59327-144-2</bdi>.</cite></span>
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