Input validation error in Drupal - #VU23681
Published: December 19, 2019
Vulnerability identifier: #VU23681
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Drupal
Affected software:
Drupal
Drupal
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass imposed security restrictions.
The vulnerability exists due to insufficient validation of user-supplied file names during upload in the file_save_upload() function that does not strip the leading and trailing dot ('.') from filenames. A remote attacker with ability to download files can upload system files such as .htaccess and bypass imposed security restrictions.
Remediation
Install updates from vendor's website.