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POPhp session fixation example and fixes
 

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    <p>My question is about this summary on session fixation:</p> <ul> <li><p>Alice has an account at the bank <a href="http://unsafe.com/" rel="nofollow">http://unsafe.com/</a>. Unfortunately, Alice is not very security savvy.</p></li> <li><p>Mallory is out to get Alice's money from the bank.</p></li> <li><p>Alice has a reasonable level of trust in Mallory, and will visit links Mallory sends her.</p> <ol> <li>Mallory has determined that <a href="http://unsafe.com/" rel="nofollow">http://unsafe.com/</a> accepts any session identifier, accepts session identifiers from query strings and has no security validation. <a href="http://unsafe.com/" rel="nofollow">http://unsafe.com/</a> is thus not secure. </li> <li>Mallory sends Alice an e-mail: "Hey, check this out, there is a cool new account summary feature on our bank,http://unsafe.com/?SID=I_WILL_KNOW_THE_SID". Mallory is trying to fixate the SID to I_WILL_KNOW_THE_SID.</li> <li>Alice is interested and visits <a href="http://unsafe.com/?SID=I_WILL_KNOW_THE_SID" rel="nofollow">http://unsafe.com/?SID=I_WILL_KNOW_THE_SID</a>. The usual log-on screen pops up, and Alice logs on. </li> <li>Mallory visits <a href="http://unsafe.com/?SID=I_WILL_KNOW_THE_SID" rel="nofollow">http://unsafe.com/?SID=I_WILL_KNOW_THE_SID</a> and now has unlimited access to Alice's account. (credit: RichieHindle)</li> </ol></li> </ul> <p>Questions:</p> <p>Q1 - Is there a way to explicitly prevent the site from accepting any session identifier?</p> <p>Q2 - I don't use the $_GET variable on my site so is there a way to prevent accepting session identifiers from query strings? </p> <ul> <li>Notes: I'm using php 5.4.3 with SSL and will also use session_regenerate_id..</li> </ul>
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    1. COWorth a read http://phpsec.org/projects/guide/4.html
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