Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS1qcTRwLW1xMzMtdzM3Nc0nOQ

Cross-site Scripting when rendering error messages in laminas-form

Impact

When rendering validation error messages via the formElementErrors() view helper shipped with laminas-form, many messages will contain the submitted value. However, in vulnerable versions of laminas-form, the value was not being escaped for HTML contexts, which can potentially lead to a Reflected Cross-Site Scripting (XSS) attack.

Patches

The following versions were issued to mitigate the vulnerability:

• 2.17.1
• 3.0.2
• 3.1.1

Workarounds

At the top of a view script where you call the formElementErrors() view helper, place the following code:

use Laminas\Form\ElementInterface;
use Laminas\View\PhpRenderer;

$escapeMessages = function (ElementInterface $formOrElement, PhpRenderer $renderer): void {
    $messages = $element->getMessages();
    if (! $messages) {
        return;
    }

    $escaped  = [];
    array_walk_recursive(
        $messages,
        static function (string $item) use (&$escaped, $renderer): void {
            $escaped[] = $renderer->escapeHtml($item);
        }
    };

    $element->setMessages($escaped);
};

Before calling formElementErrors() with a form, fieldset, or element, call the above closure as follows

// Usage with a form
// $this is the view renderer
$escapeMessages($form, $this);

// Usage with a fieldset
// $this is the view renderer
$escapeMessages($fieldset, $this);

// Usage with a form element
// $this is the view renderer
$escapeMessages($element, $this);

For more information

If you have any questions or comments about this advisory:

• Open an issue
• Email us at [email protected]

Permalink: https://github.com/advisories/GHSA-jq4p-mq33-w375
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1qcTRwLW1xMzMtdzM3Nc0nOQ
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: over 2 years ago
Updated: about 1 year ago

CVSS Score: 6.1
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Identifiers: GHSA-jq4p-mq33-w375, CVE-2022-23598
References:

• https://github.com/laminas/laminas-form/security/advisories/GHSA-jq4p-mq33-w375
• https://nvd.nist.gov/vuln/detail/CVE-2022-23598
• https://github.com/laminas/laminas-form/commit/43005a3ec4c2292d4f825273768d9b884acbca37
• https://getlaminas.org/security/advisory/LP-2022-01
• https://lists.fedoraproject.org/archives/list/[email protected]/message/CFF6WJ5I7PSEBRF6I753WKE2BXFBGQXE/
• https://lists.fedoraproject.org/archives/list/[email protected]/message/SLNABVK26CE4PFL57VLY242FW3QY4CPC/
• https://github.com/laminas/laminas-form/releases/tag/2.17.1
• https://github.com/advisories/GHSA-jq4p-mq33-w375

Repository: https://github.com/laminas/laminas-form
Blast Radius: 18.6

Affected Packages