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Start learningUpgrade zendframework/zendframework
to version 2.3.4, 2.2.9 or higher.
Affected versions of zendframework/zendframework
are vulnerable to Insufficient Session Validation.
Zend\Session
session validators do not work as expected if set prior to the start of a session.
The implication is that subsequent calls to Zend\Session\SessionManager#start()
(in later requests, assuming a session was created) will not have any validator metadata attached, which causes any validator metadata to be re-built from scratch, thus marking the session as valid.
An attacker is thus able to simply ignore session validators such as RemoteAddr
or HttpUserAgent
, since the "signature" that these validators check against is not being stored in the session.