XSS in Novnc
CVE-2017-18635
An XSS vulnerability was discovered in noVNC before 0.6.2 in which the remote VNC server could inject arbitrary HTML into the noVNC web page via the messages propagated to the status field, such as the VNC server name.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.048 (91.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 91.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.048 · newest: 0.048 · change: -0.000
Affected products
- Novnc
- Canonical Ubuntu Linux — versions 16.04
- Debian Linux — versions 8.0, 9.0
- Red Hat OpenStack — versions 13
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/novnc/noVNC/issues/748 (Patch, Third Party Advisory)
- github.com/novnc/noVNC/releases/tag/v0.6.2 (Third Party Advisory, Release Notes)
- bugs.launchpad.net/horizon/+bug/1656435 (Third Party Advisory, Issue Tracking)
- github.com/novnc/noVNC/commit/6048299a138e078aed210f163111698c8c526a13 (Patch, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2019/10/msg00004.html (mailing-list, Mailing List, Third Party Advisory)
- www.shielder.it/blog/exploiting-an-old-novnc-xss-cve-2017-18635-in-openstack/ (Exploit, Third Party Advisory)
- github.com/ShielderSec/cve-2017-18635 (Third Party Advisory)
- access.redhat.com/errata/RHSA-2020:0754 (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/4522-1/ (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/12/msg00024.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2017-18635?
- CVE-2017-18635 is a medium-severity vulnerability in Novnc, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-09-25.
- How severe is CVE-2017-18635?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2017-18635 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.