CVE-2017-18635 Cross-Site Scripting in @novnc/novnc

What is CVE-2017-18635?

CVE-2017-18635 is a medium-severity cross-site scripting vulnerability in Canonical Ubuntu Linux, published on 25 Sep 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

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.

Weakness: CWE-79

Which versions are affected by CVE-2017-18635?

2 open source packages ship an affected version, including @novnc/novnc. It affects 4 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Novnc Novnc, Redhat Openstack.

How do I fix CVE-2017-18635?

Upgrade @novnc/novnc to 0.6.2 or later.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2017-18635 being exploited?

There is no known exploitation of CVE-2017-18635 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2017-18635, DLA-1946-1, DLA-2854-1, GHSA-49rv-g7w5-m8xx, MGASA-2020-0374, RHSA-2020:0754 and 2 more.