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Fencer Intel
medium 6.5

GHSA-62f6-h68r-3jpw json

Zendframework 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/zendframework 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/zendframework
>=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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