Vulnerability identifier: #VU25397

Vulnerability risk: Low

CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-8823

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SockJS for Node
Web applications / JS libraries

Vendor: SockJS

Description

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

The vulnerability exists due to insufficient sanitization of user-supplied data when processing data passed via the "/htmlfile c" (aka callback) parameter in "lib/transport/htmlfile.js". 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 website.

Vulnerable software versions

SockJS for Node: 0.0.1 - 0.2.1

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External links
http://github.com/theyiyibest/Reflected-XSS-on-SockJS
http://www.sockjs.org

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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.