Session hijacking attack
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The Session Hijacking attack consists of the exploitation of the web session control mechanism, which is normally managed for a session token.
Because http communication uses many different TCP connections, the web server needs a method to recognize every user’s connections. The most useful method depends on a token that the Web Server sends to the client browser after a successful client authentication. A session token is normally composed of a string of variable width and it could be used in different ways, like in the URL, in the header of the http requisition as a cookie, in other parts of the header of the http request, or yet in the body of the http requisition.
The Session Hijacking attack compromises the session token by stealing or predicting a valid session token to gain unauthorized access to the Web Server.
The session token could be compromised in different ways; the most common are:
- Predictable session token;
- Session Sniffing;
- Man-in-the-middle attack
- Man-in-the-browser attack
In the example, as we can see, first the attacker uses a sniffer to capture a valid token session called “Session ID”, then he uses the valid token session to gain unauthorized access to the Web Server.
Cross-site script attack
<SCRIPT> alert(document.cookie); </SCRIPT>
Other Examples The following attacks intercept the information exchange between the client and the server:
Related Threat Agents