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Bug 1082177 - (CVE-2014-2667) CVE-2014-2667 python: os.makedirs(exist_ok=True) is not thread-safe in Python 3.x
CVE-2014-2667 python: os.makedirs(exist_ok=True) is not thread-safe in Python...
Status: CLOSED WONTFIX
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20140328,repor...
: Security
Depends On: 1083594
Blocks: 1082178
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Reported: 2014-03-28 18:19 EDT by Vincent Danen
Modified: 2016-11-03 17:07 EDT (History)
22 users (show)

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Doc Type: Bug Fix
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Last Closed: 2016-11-03 17:07:34 EDT
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Description Vincent Danen 2014-03-28 18:19:00 EDT 
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 18:25:59 EDT 
CVE request:

http://openwall.com/lists/oss-security/2014/03/28/15
Comment 2 Vincent Danen 2014-03-28 18:26:33 EDT 
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 02:08:08 EDT 
MITRE assigned CVE-2014-2667 to this issue:

http://seclists.org/oss-sec/2014/q1/700
Comment 4 Stefan Cornelius 2014-04-02 10:15:48 EDT 
Created python3 tracking bugs for this issue:

Affects: fedora-all [bug 1083594]
Comment 6 Fedora Update System 2014-12-11 23:23:28 EST 
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 01:16:35 EST 
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.
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