Executive Summary

This Alert is flagged as TOP 25 Common Weakness Enumeration from CWE/SANS. For more information, you can read this.
Title novnc security update
Name RHSA-2020:0754 First vendor Publication 2020-03-10
Vendor RedHat Last vendor Modification 2020-03-10
Severity (Vendor) N/A Revision 01

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Cvss Base Score 4.3 Attack Range Network
Cvss Impact Score 2.9 Attack Complexity Medium
Cvss Expoit Score 8.6 Authentication None Required
Calculate full CVSS 2.0 Vectors scores


Problem Description:

An updated novnc package that fixes one security issue is now available for Red Hat Enterprise Linux OpenStack Platform 13.0.

Red Hat Product Security has rated this update as having Moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

2. Relevant releases/architectures:

Red Hat OpenStack Platform 13.0 - noarch Red Hat OpenStack Platform 13.0 for RHEL 7.6 EUS Server - noarch

3. Description:

The novnc package provides a VNC client that uses HTML5 (Web Sockets, Canvas) and includes encryption support.

An XSS vulnerability was discovered in noVNC in which arbitrary HTML could be injected into the noVNC web page. An attacker having access to a VNC server could use target host values in a crafted URL to gain access to secure information (such as VM tokens). (CVE-2017-18635)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

4. Solution:

Before applying this update, make sure all previously released errata relevant to your system have been applied.

For details on how to apply this update, refer to:


5. Bugs fixed (https://bugzilla.redhat.com/):

1484711 - [OSP13] rebase novnc to 1.1.0 1765660 - CVE-2017-18635 novnc: XSS vulnerability via the messages propagated to the status field

Original Source

Url : https://rhn.redhat.com/errata/RHSA-2020-0754.html

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-79 Failure to Preserve Web Page Structure ('Cross-site Scripting') (CWE/SANS Top 25)

CPE : Common Platform Enumeration

Application 1

Alert History

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Date Informations
2020-03-19 13:20:05
  • First insertion