#VU30739 Cross-site scripting in noVNC - CVE-2017-18635
Vulnerability identifier: #VU30739
Vulnerability risk: Low
CVSSv4.0: 2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P/U:Clear]
CVE-ID:
CWE-ID:
CWE-79
Exploitation vector: Network
Exploit availability: Yes
Vulnerable software:
noVNC
Other software /
Other software solutions
Vendor: kanaka (Joel Martin)
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 messages propagated to the status field, such as the VNC server name. 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
Update to version 0.6.2.
Vulnerable software versions
noVNC: 0.6.0 - 0.6.1
External links
https://access.redhat.com/errata/RHSA-2020:0754
https://bugs.launchpad.net/horizon/+bug/1656435
https://github.com/novnc/noVNC/commit/6048299a138e078aed210f163111698c8c526a13#diff-286f7dc7b881e942e97cd50c10898f03L534
https://github.com/novnc/noVNC/issues/748
https://github.com/novnc/noVNC/releases/tag/v0.6.2
https://github.com/ShielderSec/cve-2017-18635
https://lists.debian.org/debian-lts-announce/2019/10/msg00004.html
https://www.shielder.it/blog/exploiting-an-old-novnc-xss-cve-2017-18635-in-openstack/
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.
