Bug 1559071 (CVE-2018-8048)

Summary:	CVE-2018-8048 rubygem-loofah: XSS vulnerability due to unescaped comments within attributes by libxml2
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	bmidwood, cpelland, dajohnso, dmetzger, gblomqui, gmccullo, gtanzill, hhorak, hhudgeon, jaruga, jfrey, jhardy, jorton, jprause, kdixon, ktdreyer, lavenel, obarenbo, pvalena, rcosta, roliveri, ruby-maint, simaishi
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	rubygem-loofah 2.2.1	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-10 10:18:18 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1559072, 1559073, 1560026, 1560027, 1560028, 1560029
Bug Blocks:	1559074

Description Adam Mariš 2018-03-21 16:16:54 UTC

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

Affected versions: Loofah < 2.2.1, but only:

* when running on MRI or RBX,
* in combination with libxml2 >= 2.9.2.

Upstream bug:

https://github.com/flavorjones/loofah/issues/144

Upstream patch:

https://github.com/flavorjones/loofah/commit/f739cf8eac5851f328b8044281d6653f74eff116

Reference:

http://seclists.org/oss-sec/2018/q1/253

Comment 1 Adam Mariš 2018-03-21 16:17:21 UTC

Created rubygem-loofah tracking bugs for this issue:

Affects: fedora-all [bug 1559072]

Comment 4 Kurt Seifried 2018-03-23 18:41:22 UTC

Statement:

This issue affects the versions of rubygem-loofah as shipped with Red Hat CloudForms 4. Red Hat Product Security has rated this issue as having a security  impact of Moderate. This vulnerability won't be fixed on CloudForms 4, because it uses libxml 2.9.1 and since the vulnerability requires a libxml >= 2.9.2 in order to be exploitable. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/