Vulnerability identifier: #VU22211

Vulnerability risk: Low

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-16989

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
FusionPBX
Server applications / SCADA systems

Vendor: FusionPBX

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data passed via an unsanitized "c" variable to app\conferences_active\conference_interactive.php script. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation
Install update from vendor's repository.

Vulnerable software versions

FusionPBX: Master

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External links
http://github.com/fusionpbx/fusionpbx/commit/83123e314a2e4c2dd0815446f89bcad97278d98d
http://resp3ctblog.wordpress.com/2019/10/19/fusionpbx-xss-19/
http://www.fusionpbx.com/app/tickets/ticket_edit.php?id=e7d9acc9-d629-4f7c-adef-dd95344fdb9f

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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.