Session Fixation Affecting pow package, versions <1.0.16



    Attack Complexity Low

    Threat Intelligence

    EPSS 0.06% (24th percentile)
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5.4 medium

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  • Snyk ID SNYK-HEX-POW-1086584
  • published 18 Mar 2021
  • disclosed 7 Jan 2020
  • credit Unknown

How to fix?

Upgrade pow to version 1.0.16 or higher.


Affected versions of this package are vulnerable to Session Fixation via use of Plug.Session in Pow.Plug.Session if a persistent session store is used for Plug.Session, such as Redis or a database.

N.B.: Cookie store, which is used in most Phoenix apps, does not have this vulnerability.

A workaround is to call Plug.Conn.configure_session(conn, renew: true) periodically and after privilege change. A custom authorization plug can be written where the create/3 method should return the conn only after Plug.Conn.configure_session/2 have been called on it.