Bug 1082177 (CVE-2014-2667)

Summary:	CVE-2014-2667 python: os.makedirs(exist_ok=True) is not thread-safe in Python 3.x
Product:	[Other] Security Response	Reporter:	Vincent Danen <vdanen>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	amcnabb, bkabrda, carnil, derks, dmalcolm, drieden, extras-orphan, ivazqueznet, jberan, jeffrey.ness, jkurik, jonathansteffan, jorton, katzj, mmaslano, mmcgrath, ncoghlan, nobody+bgollahe, python-maint, tdawson, tomspur, tradej
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-11-03 21:07:34 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:	1083594
Bug Blocks:	1082178

Description Vincent Danen 2014-03-28 22:19:00 UTC

It was reported [1] that a patch added to Python 3.2 [2] caused a race condition where a file created could be created with world read/write permissions instead of the permissions dictated by the original umask of the process.  This could allow a local attacker that could win the race to view and edit files created by a program using this call.

Note that prior versions of Python, including 2.x, do not include the vulnerable _get_masked_mode() function that is used by os.makedirs() when exist_ok is set to True.


[1] http://bugs.python.org/issue21082
[2] http://bugs.python.org/issue9299

Comment 1 Vincent Danen 2014-03-28 22:25:59 UTC

CVE request:

http://openwall.com/lists/oss-security/2014/03/28/15

Comment 2 Vincent Danen 2014-03-28 22:26:33 UTC

Statement:

Not vulnerable. This issue did not affect the versions of python as shipped with Red Hat Enterprise Linux 5 and 6.

Comment 3 Murray McAllister 2014-03-31 06:08:08 UTC

MITRE assigned CVE-2014-2667 to this issue:

http://seclists.org/oss-sec/2014/q1/700

Comment 4 Stefan Cornelius 2014-04-02 14:15:48 UTC

Created python3 tracking bugs for this issue:

Affects: fedora-all [bug 1083594]

Comment 6 Fedora Update System 2014-12-12 04:23:28 UTC

python3-3.3.2-19.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 7 Fedora Update System 2015-01-06 06:16:35 UTC

python3-3.3.2-11.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.