#VU22285 Cross-site scripting in FusionPBX - CVE-2019-16979

Vulnerability identifier: #VU22285

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-16979

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 "id" variable to app\contacts\contact_urls.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 updates released on 13/08/2019 on 4.4 and Master branches.

Vulnerable software versions

FusionPBX: Master

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External links
https://github.com/fusionpbx/fusionpbx/commit/a76d9637e31a70060ecc38786246a8b1c9178322
https://resp3ctblog.wordpress.com/2019/10/19/fusionpbx-xss-12/

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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.