CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
56.3%
Drupal core sanitizes filenames with dangerous extensions upon upload and strips leading and trailing dots from filenames to prevent uploading server configuration files.
However, the protections for these two vulnerabilities previously did not work correctly together. As a result, if the site were configured to allow the upload of files with an htaccess extension, these files’ filenames would not be properly sanitized. This could allow bypassing the protections provided by Drupal core’s default .htaccess files and possible remote code execution on Apache web servers.
This issue is mitigated by the fact that it requires a field administrator to explicitly configure a file field to allow htaccess as an extension (a restricted permission), or a contributed module or custom code that overrides allowed file uploads.
github.com/drupal/core
github.com/drupal/core/commit/1cd1830d79f221cc8490f53c2bb487dd07094f17
github.com/drupal/core/commit/5d464ea4407c50e40dcf6cb5ee376e7b8dd36f3a
github.com/FriendsOfPHP/security-advisories/blob/master/drupal/core/CVE-2022-25277.yaml
nvd.nist.gov/vuln/detail/CVE-2022-25277
www.drupal.org/sa-core-2022-014