#VU36391 Arbitrary file upload in GetSimple CMS - CVE-2018-19420

Vulnerability identifier: #VU36391

Vulnerability risk: Low

CVSSv4.0: 1.2 [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: Network

Exploit availability: No

Vulnerable software:
GetSimple CMS
Web applications / CMS

Vendor: GetSimple CMS

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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

GetSimple CMS: 3.3.15

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External links
https://github.com/GetSimpleCMS/GetSimpleCMS/issues/1301

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.