Bug 1549779 (CVE-2018-7537)

Summary:	CVE-2018-7537 django: Catastrophic backtracking in regular expressions via 'truncatechars_html' and 'truncatewords_html'
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, bcourt, bkearney, cbillett, chrisw, jakub.dornak, jal233, jjoyce, jmatthew, jschluet, kbasil, lhh, lpeer, markmc, mburns, mhroncok, michel, mmccune, mrike, mrunge, ohadlevy, rbryant, rchan, rhos-maint, sclewis, security-response-team, sgallagh, sisharma, slinaber, 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 03:41:46 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:	1549907, 1549908, 1552177, 1552178, 1552179, 1552306, 1554696, 1557457, 1557458, 1557459
Bug Blocks:	1549781

Description Pedro Sampaio 2018-02-27 20:07:42 UTC

CVE-2018-7537: Denial-of-service possibility in ``truncatechars_html``
and ``truncatewords_html`` template filters
============================================================================

If ``django.utils.text.Truncator``'s ``chars()`` and ``words()`` methods
were passed the ``html=True`` argument, they were extremely slow to evaluate
certain inputs due to a catastrophic backtracking vulnerability in a regular
expression. The ``chars()`` and ``words()`` methods are used to
implement the ``truncatechars_html`` and ``truncatewords_html`` template
filters, which were thus vulnerable.

The backtracking problem in the regular expression is fixed.

Comment 5 Adam Mariš 2018-03-06 16:14:24 UTC

Acknowledgments:

Name: the Django project

Comment 6 Adam Mariš 2018-03-06 16:14:42 UTC

External References:

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

Comment 7 Adam Mariš 2018-03-06 16:17:25 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 11 Andrej Nemec 2018-05-14 15:22:33 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 12 errata-xmlrpc 2018-10-16 15:20:58 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 13 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