Vulnerability identifier: #VU22208

Vulnerability risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-16986

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
FusionPBX
Server applications / SCADA systems

Vendor: FusionPBX

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to the application allows an attacker to download arbitrary file from the system passed via the "f" HTTP parameter to "/resources/download.php" or "/resources/secure_download.php" scripts. A remote authenticated user can pass a full filename to the application and download arbitrary file from the server using directory traversal sequences.

Mitigation
Install updates from vendor's repository.

Vulnerable software versions

FusionPBX: Master

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External links
http://github.com/fusionpbx/fusionpbx/commit/9482d9ee0e4287df21339be4276125e38e048951
http://github.com/fusionpbx/fusionpbx/commit/9c61191049c949e01f99ea1fbab1feb44709e108
http://resp3ctblog.wordpress.com/2019/10/19/fusionpbx-path-traversal-2/
http://www.fusionpbx.com/app/tickets/ticket_edit.php?id=2e4784b2-721e-4a15-8bef-962a3936aee1

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.