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GHSA-96c6-m98x-hxjx
No affected components available
Zend\Session session validators do not work as expected if set prior to the start of a session.
For instance, the following test case fails (where $this->manager is an instance of Zend\Session\SessionManager):
$this
->manager
->getValidatorChain()
->attach('session.validate', array(new RemoteAddr(), 'isValid'));
$this->manager->start();
$this->assertSame(
array(
'Zend\Session\Validator\RemoteAddr' =3D> '',
),
$_SESSION['__ZF']['_VALID']
);
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.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the integrity of the data.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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