Bug 1793629 (CVE-2019-20041)

Summary:	CVE-2019-20041 wordpress: HTML5 colon named entity mishandling in wp_kses_bad_protocol in wp-includes/kses.php allows bypass input sanitization
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	fedora, kevin
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-28 05:23:14 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:	1793630, 1793631
Bug Blocks:

Description Guilherme de Almeida Suckevicz 2020-01-21 17:37:24 UTC

wp_kses_bad_protocol in wp-includes/kses.php in WordPress before 5.3.1 mishandles the HTML5 colon named entity, allowing attackers to bypass input sanitization, as demonstrated by the javascript: substring.

Reference and upstream commit:
https://github.com/WordPress/wordpress-develop/commit/b1975463dd995da19bb40d3fa0786498717e3c53

Comment 1 Guilherme de Almeida Suckevicz 2020-01-21 17:38:24 UTC

Created wordpress tracking bugs for this issue:

Affects: epel-6 [bug 1793630]
Affects: epel-7 [bug 1793631]