How i met your mother season 8 torrent download 2017. By default, sessions are made by 4 infos: • The user's unique Session ID (this is a statistically random string with very strong entropy, hashed with MD5 for portability, and regenerated (by default) every five minutes) • The user's IP Address • The user's User Agent data (the first 120 characters of the browser data string) • The 'last activity' time stamp. Plus your own session datas, of course. 3 of this four datas don't need to be secure, while the first should be quite reliable, even though using MD5, I didn't dive into the code to actually see if it is so (and I'm no security expert). The security level of the latter infos depends on what kind of information you're storing there, and how well you treat them before storing. You can also decide to store sessions using the database instead, which will be a safer option (provided you don't screw up allowing sql injections!). Note also that: If you have the encryption option enabled, the serialized array will be encrypted before being stored in the cookie, making the data highly secure and impervious to being read or altered by someone. More info regarding encryption can be found, although the Session class will take care of initializing and encrypting the data automatically.

So well, they should be quite secure; if you don't trust them enough, you're free to hash or encrypt your data how much you want, or still make use of PHP native Sessions without problems.

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Codeigniter is one of my favorite PHP framework. Like every one else, I’ve learned PHP MVC programming with this framework. Today, I decided to analyze Codeigniter for PHP Object Injection Vulnerability.

I’ll focus on Session mechanism of Codeigniter at rest of this write-up. All method that I will explain are located in CodeIgniter/system/libraries/Session.php file. Also I used Codeigniter 2.1 stable release for this research. Codeigniter Session Mechanism CI use serialization methods of PHP to store variables in user session. But Codeigniter session mechanism is not working like we expect.

It stores session variables in client’s cookie. We expect that Codeigniter stores session variables at server side, mostly on disk instead of user cookie. I don’t know why developers decided to this way.

Following description grabbed from codeigniter documentation. The Session class stores session information for each user as serialized (and optionally encrypted) data in a cookie. Even if you are not using encrypted sessions, you must set an in your config file which is used to aid in preventing session data manipulation. In this write-up we will analyze the possibilities of session data manipulation and so on. Codeigniter Session Data Structers Let’s start read some codes. But before go further let me explain how Codeigniter creates sessions and put variables into the session -actually cookie!- I will use CI shortcut instead of Codeigniter at rest of the write-up by the way. Lets start to review codes with construct method of Session class. Following codes are a part of __construct method.

} Line 4 = Get cookie from client. Download the long tunnel john milne pdf to doc. Line 7 = Check returned value. If it is false, that means client don’t have cookie! Line 13 = If encryption is enabled.

-In write-up case it’s not!- Line 20 = Strip out hash from cookie. -Remember my previous explanation. CI addes md5 hash end of the session data – Line 21 = Strip out session data from cookie. Line 24 = Md5 calculation in order to check data integrity. Does the md5 hash match? This is to prevent manipulation of session data in userspace Line 32 = Call _unserialize method of Session data! -Now we can think about Object Injection Vulnerability.- Rest of the code CI check session variables and user-agents.