In the Loofah gem through 2.2.0 for Ruby, non-whitelisted HTML attributes may occur in sanitized output by republishing a crafted HTML fragment.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2019:0212 advisory.

    Red Hat CloudForms Management Engine delivers the insight, control, and automation needed to address the     challenges of managing virtual environments. CloudForms Management Engine is built on Ruby on Rails, a     model-view-controller (MVC) framework for web application development. Action Pack implements the     controller and the view components.

    Security Fix(es):

    * rubygem-sinatra: XSS in the 400 Bad Request page (CVE-2018-11627)

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

    Additional Changes:

    This update fixes various bugs and adds enhancements. Documentation for these changes is available from     the Release Notes document linked to in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Shopify Application Security Team reported that ruby-loofah, a general library for manipulating and transforming HTML/XML documents and fragments, allows non-whitelisted attributes to be present in sanitized output when input with specially crafted HTML fragments.
This might allow to mount a code injection attack into a browser consuming sanitized output.

GitHub issue :

This issue has been created for public disclosure of an XSS / code injection vulnerability that was responsibly reported by the Shopify Application Security Team.

Loofah allows non-whitelisted attributes to be present in sanitized output when input with specially crafted HTML fragments.

ID	Name	Product	Family	Severity
210303	RHEL 7 : CloudForms 4.7 (RHSA-2019:0212)	Nessus	Red Hat Local Security Checks	high
109046	Debian DSA-4171-1 : ruby-loofah - security update	Nessus	Debian Local Security Checks	medium
108508	FreeBSD : Loofah -- XSS vulnerability (ba6d0c9b-f5f6-4b9b-a6de-3cce93c83220)	Nessus	FreeBSD Local Security Checks	medium

Detections

Analytics

CVE-2018-8048

medium

Tenable Plugins

high

medium

medium