Bug 1549777 (CVE-2018-7536)

Summary:	CVE-2018-7536 django: Catastrophic backtracking in regular expressions via 'urlize' and 'urlizetrunc'
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	apevec, augol, bcourt, bkearney, cbillett, chrisw, jakub.dornak, jal233, jjoyce, jmatthew, jschluet, kbasil, lhh, lpeer, mariel, markmc, mburns, mhroncok, michel, mmccune, mrike, mrunge, ohadlevy, rbryant, rchan, rhos-maint, sclewis, security-response-team, sgallagh, sisharma, slinaber, slong, srevivo, ssaha, tdecacqu, tomckay, tsanders, vbellur
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	Django 2.0.3, Django 1.11.11, Django 1.8.19	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 03:41:44 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:	1549905, 1549906, 1551895, 1551896, 1551897, 1551898, 1551899, 1551900, 1551901, 1552177, 1552178, 1552179, 1552307, 1554694, 1557374, 1557395, 1557396
Bug Blocks:	1549781

Description Pedro Sampaio 2018-02-27 19:59:49 UTC

CVE-2018-7536: Denial-of-service possibility in ``urlize`` and
``urlizetrunc`` template filters
===========================================================================

The ``django.utils.html.urlize()`` function was extremely slow to evaluate
certain inputs due to catastrophic backtracking vulnerabilities in two
regular expressions (one regular expression for Django 1.8). The
``urlize()``
function is used to implement the ``urlize`` and ``urlizetrunc`` template
filters, which were thus vulnerable.

The problematic regular expressions are replaced with parsing logic that
behaves similarly.

Comment 5 Adam Mariš 2018-03-06 16:13:39 UTC

Acknowledgments:

Name: the Django project

Comment 6 Adam Mariš 2018-03-06 16:13:57 UTC

External References:

https://www.djangoproject.com/weblog/2018/mar/06/security-releases/

Comment 7 Adam Mariš 2018-03-06 16:17:00 UTC

Created python-django tracking bugs for this issue:

Affects: fedora-all [bug 1552178]
Affects: epel-7 [bug 1552179]


Created python-django16 tracking bugs for this issue:

Affects: epel-7 [bug 1552177]

Comment 13 Andrej Nemec 2018-05-14 15:19:51 UTC

Statement:

This issue affects the versions of django as shipped with Red Hat Subscription Asset Manager. Red Hat Product Security has rated this issue as having security impact of Moderate. A future update may address this issue. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.

Comment 14 errata-xmlrpc 2018-10-16 15:20:55 UTC

This issue has been addressed in the following products:

  Red Hat Satellite 6.4 for RHEL 7

Via RHSA-2018:2927 https://access.redhat.com/errata/RHSA-2018:2927

Comment 18 errata-xmlrpc 2019-01-16 17:11:49 UTC

This issue has been addressed in the following products:

  Red Hat OpenStack Platform 10.0 (Newton)

Via RHSA-2019:0051 https://access.redhat.com/errata/RHSA-2019:0051

Comment 19 errata-xmlrpc 2019-01-16 17:52:52 UTC

This issue has been addressed in the following products:

  Red Hat OpenStack Platform 13.0 (Queens)

Via RHSA-2019:0082 https://access.redhat.com/errata/RHSA-2019:0082

Comment 20 errata-xmlrpc 2019-02-04 07:43:40 UTC

This issue has been addressed in the following products:

  Red Hat Gluster Storage 3.4 for RHEL 7

Via RHSA-2019:0265 https://access.redhat.com/errata/RHSA-2019:0265