Bug 1536921 (CVE-2018-5773)

Summary:	CVE-2018-5773 python-markdown2: Unsanitized input in markdown() method allows for cross-site scripting (XSS)
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	thomas.moschny
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:	2019-06-08 03:37:46 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:	1536922, 1536923
Bug Blocks:	1536925

Description Sam Fowler 2018-01-22 03:28:44 UTC

An issue was discovered in markdown2 (aka python-markdown2) through 2.3.5. The safe_mode feature, which is supposed to sanitize user input against XSS, is flawed and does not escape the input properly. With a crafted payload, XSS can be triggered, as demonstrated by omitting the final '>' character from an IMG tag.

External References:
https://nvd.nist.gov/vuln/detail/CVE-2018-5773

Upstream Issue:
https://github.com/trentm/python-markdown2/issues/285

Comment 1 Sam Fowler 2018-01-22 03:29:16 UTC

Created python-markdown2 tracking bugs for this issue:

Affects: epel-all [bug 1536922]
Affects: fedora-all [bug 1536923]

Comment 2 Product Security DevOps Team 2019-06-08 03:37:46 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.