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Fencer Intel
medium 6.5

GHSA-96c6-m98x-hxjx json

Zend-Session session validation vulnerability

published 2y ago modified last yr.

cvss
6.5
version 3.1, GitHub
cisa kev
Not listed
not in CISA's catalog
epss
—
no score, EPSS covers CVEs only
public exploits
0
none known

Summary

`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.

Patch / fix

  • packagist zendframework/zend-session 2.2.9, 2.3.4

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CVSS scores

assigned by version score vector
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
packagist zendframework/zend-session
>=2.0.0, <2.2.9
>=2.3.0, <2.3.4
2.2.9
2.3.4

Classification

Weakness

References

Sources

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