Many web-based applications employ some kind of session management to create a user-friendly environment. Sessions are stored on server and associated with respective users by session identifiers (IDs). To prevent attackers hijacking users' identities by obtaining session IDs, 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 attacks against session IDs: session fixation attacks.
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