CVE-2018-3741 rails-html-sanitizer Cross-site Scripting vulnerability
Attackers can inject malicious scripts via specially-crafted HTML fragments in applications using the vulnerable Ruby sanitizer gem.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2018-3741?
CVE-2018-3741 is a medium-severity cross-site scripting vulnerability in rails-html-sanitizer, published on 30 Mar 2018. 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
There is a possible XSS vulnerability in all rails-html-sanitizer gem versions below 1.0.4 for Ruby. The gem allows non-whitelisted attributes to be present in sanitized output when input with specially-crafted HTML fragments, and these attributes can lead to an XSS attack on target applications. This issue is similar to CVE-2018-8048 in Loofah. All users running an affected release should either upgrade or use one of the workarounds immediately.
Weakness: CWE-79
Which versions are affected by CVE-2018-3741?
2 open source packages ship an affected version, including rails-html-sanitizer. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
rails-html-sanitizer RubyGems | All versions | 1.0.4 |
rails-html-sanitizer RubyGems | All versions | 1.0.4 |
Linux distribution packages (4)
rubygem-rails-html-sanitizer SUSE:Enterprise Storage 4 | All versions | 1.0.3-8.8.1 |
rubygem-rails-html-sanitizer SUSE:OpenStack Cloud 7 | All versions | 1.0.3-8.8.1 |
rubygem-rails-html-sanitizer SUSE:OpenStack Cloud Crowbar 8 | All versions | 1.0.3-8.8.1 |
rubygem-rails-html-sanitizer SUSE:OpenStack Cloud Crowbar 9 | All versions | 1.0.3-8.8.1 |
Products include Rubyonrails Html Sanitizer.
How do I fix CVE-2018-3741?
Upgrade rails-html-sanitizer to 1.0.4 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-2018-3741 being exploited?
There is no known exploitation of CVE-2018-3741 in the wild and no public exploit code.
Other vulnerabilities in rails-html-sanitizer
Sources
Also known as DEBIAN-CVE-2018-3741, GHSA-px3r-jm9g-c8w8, SUSE-SU-2019:2182-1, UBUNTU-CVE-2018-3741.