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Kategori: Web Servers Riskfaktor: High Tillagt: 18 mar 2010
Synopsis:

The remote web application may be vulnerable to a session fixation
attack.

Description:

The remote web application uses cookies to track authenticated users. If the session cookie is already present before authentication, it remains unchanged after a successful login. That is, only server-side variables are updated.

Session cookies are expected to be unpredictable in a secure web application. If HTTP cookies can be manipulated (by injecting client- side JavaScript for example), then the attacker does not have to break the pseudo-random generator, and the web application is vulnerable to a 'session fixation' attack.

See also:

http://en.wikipedia.org/wiki/Session_fixation
http://www.owasp.org/index.php/Session_Fixation

Solution:

Fix the application so that the session cookie is re-generated after successful authentication.

Risk factor:

High / CVSS Base Score : 7.5
(CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P)