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    <p>Similar to <a href="https://stackoverflow.com/a/10587959/53114">sivann</a>, I can’t see the reason for the additional <em>spanel_token</em> either. All it seems to effectively do is to ensure that the session is no longer valid after the token’s expiration time. Since both values for <em>token</em> and <em>user_id</em> for the <code>WHERE</code> condition are stored in the session and are only set during the login, they won’t change. <a href="https://stackoverflow.com/a/1270960/53114">But session expiration can be implemented much easier.</a></p> <hr> <p>But apart from that and much more important: your code is vulnerable to SQL injection. It would be easy with the knowledge you’ve posted here. All you need is to do the following steps:</p> <ul> <li><p>Find out the number of columns of <em>users</em> with a <code>UNION SELECT</code> injection in <em>email</em>:</p> <pre><code>' UNION SELECT null, …, null WHERE ''=' </code></pre> <p>If the wrong number of columns is entered, your script will throw a MySQL error, otherwise the “Login Failed.” will appear. Thanks for that.</p></li> <li><p>By using the following query:</p> <pre><code>SELECT t1.* FROM users t1 RIGHT JOIN (SELECT email, '000000000000000000000000000000000000000000000000000000000000000060e05bd1b195af2f94112fa7197a5c88289058840ce7c6df9693756bc6250f55' hash FROM users LIMIT 1) t2 USING (email); </code></pre> <p>the value <code>000000000000000000000000000000000000000000000000000000000000000060e05bd1b195af2f94112fa7197a5c88289058840ce7c6df9693756bc6250f55</code> is injected into each record instead of the original <em>hash</em> column value. The leading <code>0</code>s are the salt and the remaining string is the salted SHA-256 hash value for an empty password string, which will result in a valid password.</p> <p>So we end up with entering an empty string for the <em>password</em> field and the following for the <em>email</em> field:</p> <pre><code>' UNION SELECT t2.* FROM users t1 RIGHT JOIN (SELECT email, '000000000000000000000000000000000000000000000000000000000000000060e05bd1b195af2f94112fa7197a5c88289058840ce7c6df9693756bc6250f55' hash FROM users LIMIT 1) t2 USING (email) WHERE ''=' </code></pre></li> </ul> <p>This should suffice to get ‘authenticated’ as any user.</p>
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    1. POPHP login security Idea
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    1. CO@akester I’d like to know if this actually works. ;)
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    2. COI realized the SQL problem shortly after someone else pointed it out. I usually leave it out of development because the `mysql_real_escape_string` function never seems to work without some work (From what I gathered,I think it's proper, but I could be wrong). As for the rest of it, I realize now how flawed the design was, and I'm most defiantly going to implement openid. I guess my thinking was that an attacker could spoof the cookie information, (like a replay attack, but using original information) but after the comments here I'll stop sticking my nose where it doesn't belong.
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    3. CO@akester Simply copying the cookie will always be possible. The key is to protect the cookie as much as possible.
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