Session Fixation
Last modified: 2023-04-15
Cookie
Web
Session fixation attacks attempt to exploit the vulnerability of a system that allows one person to fixate another person’s session identifier.
Exploitation
1. Attacker Logins Website to Get the Session
An attacker need to login to a legitimate website then get the session value.
Cookie: sessid=abcdef
2. Attacker Sends the Session Value to Victim
There are various way to send the attacker’s session value. For example,
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Send email.
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Predict a session value.
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Eavesdrop a session using packet sniffer such as Wireshark.
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XSS
<script>document.cookie = ATTACKERS_SESSION_ID</script>
3. Victim Logins with Attacker’s Session
If the victim logins and attacker’s session is set to the Cookie, the attacker can control the victim’s account in the website.