Session Variable Loss and Session Fixation in ColdFusion

ColdFusion Variable is undefined in Session

For the proper explanation of Session Fixation and how a session is undefined see
http://www.petefreitag.com/item/815.cfm

Watch out for the version of Coldfusion you are running and the hot fixes as there are differences
http://www.bennadel.com/blog/2050-changes-in-cflocation-onrequestend-behavior-in-coldfusion-9-s-application-cfc.htm


Session Fixation Bug (it's back to the old sessions lost after cflocation which was either introduced as a bug or fixed in CFMX6 )

"A JVM property was added in case you want to completely switch off the fix for the Session Fixation issue ( Bug 86378) which prior to this security release changed Session behavior in some environments. Add the following JVM property -Dcoldfusion.session.protectfixation=false in the JVM Arguments for the Coldfusion Server."

http://helpx.adobe.com/coldfusion/kb/security-hotfix-coldfusion-8-8.html


Programmatically can be fixed using the below:

<cfif structKeyExists(session,"cfid")>
<cfcookie name="cfid" value="#session.cfid#" expires="NOW">
<cfcookie name="cftoken" value="#session.cftoken#" expires="NOW">
</cfif>


Of course locking the session will always fix this issue.


Other usefull links

http://www.horisk.com/blog/index.cfm/2011/5/19/Session-issues-after-installing-Coldfusion-901-update--OnRequestEnd-behaviour-change



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