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ColdFusion Authors: Yakov Fain, Jeremy Geelan, Maureen O'Gara, Nancy Y. Nee, Tad Anderson

Related Topics: ColdFusion, Java IoT, Machine Learning , Agile Computing

ColdFusion: Article

ColdFusion Developer's Journal Special: How to Prevent an SQL Injection Attack

SQL Injection Attacks are One of the Easiest Ways to Hack Into A Website - Learn How to Prevent Them

SQL Injection attacks are one of the easiest ways to hack into a website. One recent hack, using a script from verynx.cn, involves injecting SQL into a web form that then appends some JavaScript code into fields in a database that then gets executed on the client side when a user views a database-driven page. To learn more about this hack, go to this link.

<!--- CREATE SQL REGULAR EXPRESSION--->
<cfset sqlregex = "
(SELECT\s[\w\*\)\(\,\s]+\sFROM\s[\w]+)|
(UPDATE\s[\w]+\sSET\s[\w\,\'\=]+)|
(INSERT\sINTO\s[\d\w]+[\s\w\d\)\(\,]*\sVALUES\s\([\d\w\'\,\)]+)|
(DELETE\sFROM\s[\d\w\'\=]+)|
(DROP\sTABLE\s[\d\w\'\=]+)">

 

<!--- CHECK FORM VARIABLES --->
<cfloop collection="#form#" item="formelement">
<cfif isSimpleValue(evaluate(formelement)) AND refindnocase(sqlregex, "#evaluate(formelement)#")>
<cflocation url="messages.cfm?message=Invalid Input. Possible SQL Injection attack.">
<cfset StructClear(form)>
<cfabort>
</cfif>
</cfloop>

 

<!--- CHECK URL VARIABLES --->
<cfloop collection="#url#" item="formelement">
<cfif isSimpleValue(evaluate(formelement)) AND refindnocase(sqlregex, "#evaluate(formelement)#")>
<cflocation url="messages.cfm?message=Invalid Input. Possible SQL Injection attack.">
<cfset StructClear(url)>
<cfabort>
</cfif>
</cfloop>

 

If you're using ColdFusion, to harden your website from sql injection attacks add the following code to your Application.cfm file. If you're not using ColdFusion, you can translate this code into the language you're using and it should still work.

This code would reside in your Application.cfm file which gets executed every time a ColdFusion file is requested on the server. What it does is it checks all form and URL variables to see if they contain any patterns matching an SQL SELECT, UPDATE, INSERT, DELETE or DROP statement.

If a match is found, the user is redirected to a message page indicating that a possible SQL Injection attack was made and the SQL injection is prevented.

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