Vulnerability identifier: #VU6851

Vulnerability risk: Medium

CVSSv3.1: 8.6 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-7570

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PivotX
Web applications / Forum & blogging software

Vendor: pivotlog.net

Description
The vulnerability allows a remote attacker to execute arbitrary PHP code on the target system.

The vulnerability exists due to insufficient error handling when processing file uploads for files with identical names. A remote authenticated attacker can upload a file with same extension (e.g. ".jpg") and then invoke a duplicate function to change the file extension to .php.

Successful exploitation may allow an attacker to compromise vulnerable website.

Mitigation
Install update from vendor's repository.

Vulnerable software versions

PivotX: 2.3.0 - 2.3.11

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External links
http://gist.github.com/X1nda/749b6aac6e080624d9f8ec81321335df

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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