Session Fixation Vulnerability in Web-based Applications – Many web-based applications employ some kind of session management to create a user friendly environment. Sessions are stored on a server and associated with respective users by sessions identifiers (IDs). Naturally session IDs present an attractive target for attackers, who, by obtaining them, effectively hijack users’ identities. Knowing that, web servers are employing techniques for protecting session IDs from three classes of attacks: interception, prediction, and brute force attacks. This paper reveals a fourth class of session attacks against session IDs: session fixation attacks.
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Source: https://packetstormsecurity.com/files/30619/session_fixation.pdf.html