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Cross-Site Scripting in @novnc/novnc

Moderate severity GitHub Reviewed Published Aug 28, 2020 to the GitHub Advisory Database • Updated Feb 1, 2023

Package

npm @novnc/novnc (npm)

Affected versions

< 0.6.2

Patched versions

0.6.2

Description

Versions of @novnc/novnc prior to 0.6.2 are vulnerable to Cross-Site Scripting (XSS). The package fails to validate input from the remote VNC server such as the VNC server name. This allows an attacker in control of the remote server to execute arbitrary JavaScript in the noVNC web page. It affects any users of include/ui.js and users of vnc_auto.html and vnc.html.

Recommendation

Upgrade to version 0.6.2 or later.

References

Published by the National Vulnerability Database Sep 25, 2019
Reviewed Aug 28, 2020
Published to the GitHub Advisory Database Aug 28, 2020
Last updated Feb 1, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS score

0.145%
(51st percentile)

Weaknesses

CVE ID

CVE-2017-18635

GHSA ID

GHSA-49rv-g7w5-m8xx

Source code

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