Vulnerability identifier: #VU22793

Vulnerability risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:P/RL:U/RC:C]

CVE-ID: CVE-2019-18839

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
FUDForum
Web applications / Forum & blogging software

Vendor: FUDforum

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 the "nlogin" parameter. A remote attacker can permanently inject 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
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

FUDForum: 3.0.9

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External links
http://github.com/fuzzlove/FUDforum-XSS-RCE/blob/master/forumxss.md
http://packetstormsecurity.com/files/155261/FUDForum-3.0.9-Code-Execution-Cross-Site-Scripting.html
http://www.youtube.com/watch?v=fR8hVK1paks&feature=youtu.be

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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.