Cross-site scripting in Nightscout Web Monitor package for npm

1) Cross-site scripting

EUVDB-ID: #VU55269

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-2021-36755

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

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 in the X-Forwarded-For header. 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

cgm-remote-monitor: 14.0.0 - 14.2.2

CPE2.3

• cpe:2.3:a:nightscout:Nightscout Web Monitor:14.0.0:*:*:*:*:*:*:
• cpe:2.3:a:nightscout:Nightscout Web Monitor:14.0.1:*:*:*:*:*:*:
• cpe:2.3:a:nightscout:Nightscout Web Monitor:14.0.2:*:*:*:*:*:*:

External links

http://github.com/nightscout/cgm-remote-monitor/commit/68f3f90e30cc1da57f7e5069f9c4e1467973521f

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.