#VU23681 Input validation error in Drupal

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Main Vulnerability Database Vulnerabilities #VU23681

#VU23681 Input validation error in Drupal

Published: December 19, 2019


Vulnerability identifier: #VU23681
Vulnerability risk: Medium
CVSSv4.0: 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
Vulnerable software:
Drupal
Software vendor:
Drupal

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.

External links