Drupal PECL YAML parser unsafe object handling
Date: 2022-05
Affected: composer/drupal/drupal, composer/drupal/core
Attack vector: rce
Category: vulnerability-disclosure
Severity: Critical
CVE: CVE-2017-6920
CVE-2017-6921
CWE: CWE-20
CWE-94
CVSS: 9.8 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Drupal core 8 before versions 8.3.4 allows remote attackers to execute arbitrary code due to the PECL YAML parser not handling PHP objects safely during certain operations.


Mitigations:

Architectural layers (MAESTRO):