Arbitrary file upload in GetSimple CMS - CVE-2018-19420
Published: November 21, 2018 / Updated: August 8, 2020
Vulnerability identifier: #VU36391
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2018-19420
CWE-ID: CWE-434
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: GetSimple CMS
Affected software:
GetSimple CMS
GetSimple CMS
Detailed vulnerability description
The vulnerability allows a remote privileged user to read and manipulate data.
In GetSimpleCMS 3.3.15, admin/upload.php blocks .html uploads but there are several alternative cases in which HTML can be executed, such as a file with no extension or an unrecognized extension (e.g., the test or test.asdf filename), because of admin/upload-uploadify.php, and validate_safe_file in admin/inc/security_functions.php.
How to mitigate CVE-2018-19420
Install update from vendor's website.