GHSA-96c6-m98x-hxjx — Zend-Session session validation vulnerability

The advisory, in context

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.

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

zendframework/zend-session Packagist

Ecosystem versions

From 2.0.0 before 2.2.9

Fixed in 2.2.9

25 explicitly affected versions

2.0.3, 2.0.4, 2.0.5, 2.0.6, 2.0.7, 2.0.8, 2.1.0, 2.1.1, 2.1.2, 2.1.3, 2.1.4, 2.1.5, 2.1.6, 2.2.0, 2.2.0rc1, 2.2.0rc2, 2.2.0rc3, 2.2.1, 2.2.2, 2.2.3, 2.2.4, 2.2.5, 2.2.6, 2.2.7, 2.2.8

View affected-version evidence

{
  "ranges": [
    {
      "events": [
        {
          "introduced": "2.0.0"
        },
        {
          "fixed": "2.2.9"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "2.0.3",
    "2.0.4",
    "2.0.5",
    "2.0.6",
    "2.0.7",
    "2.0.8",
    "2.1.0",
    "2.1.1",
    "2.1.2",
    "2.1.3",
    "2.1.4",
    "2.1.5",
    "2.1.6",
    "2.2.0",
    "2.2.0rc1",
    "2.2.0rc2",
    "2.2.0rc3",
    "2.2.1",
    "2.2.2",
    "2.2.3",
    "2.2.4",
    "2.2.5",
    "2.2.6",
    "2.2.7",
    "2.2.8"
  ]
}

zendframework/zend-session Packagist

Ecosystem versions

From 2.3.0 before 2.3.4

Fixed in 2.3.4

4 explicitly affected versions

2.3.0, 2.3.1, 2.3.2, 2.3.3

View affected-version evidence

{
  "ranges": [
    {
      "events": [
        {
          "introduced": "2.3.0"
        },
        {
          "fixed": "2.3.4"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "2.3.0",
    "2.3.1",
    "2.3.2",
    "2.3.3"
  ]
}

Set up in your agent.

Investigate in your agent.

Zend-Session session validation vulnerability

The advisory, in context

Affected packages

References