Bug 1549192 – CVE-2018-1061 python: DOS via regular expression backtracking in difflib.IS_LINE_JUNK method in difflib

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Bug 1549192 - (CVE-2018-1061) CVE-2018-1061 python: DOS via regular expression backtracking in difflib.IS_LINE_JUNK method in difflib

Summary:	CVE-2018-1061 python: DOS via regular expression backtracking in difflib.IS_L...

Status:	NEW

Aliases:	CVE-2018-1061

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20180314,repor...
Keywords:	Security

Depends On:	1563461 1563464 1563465 1563486 1563487 1563488 1563459 1563462 1563463 1563485 1563489
Blocks:	1549194
	Show dependency tree / graph

Reported:	2018-02-26 11:20 EST by Pedro Sampaio
Modified:	2018-10-30 03:24 EDT (History)
CC List:	18 users (show)

See Also:
Fixed In Version:	python 2.7.15, python 3.4.9, python 3.5.6, python 3.7.0
Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the way catastrophic backtracking was implemented in python's difflib.IS_LINE_JUNK method. An attacker could use this flaw to cause denial of service.
Story Points:	---
Clone Of:
Environment:
Last Closed:
Type:	---
Regression:	---
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Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2018:3041	None	None	None	2018-10-30 03:24 EDT

Groups: None (edit)

Description Pedro Sampaio 2018-02-26 11:20:03 EST

Catastrophic backtracking vulnerability was found in Python. Exploitation of a regular expression in difflib.IS_LINE_JUNK method in servers that use difflib can lead to denial of service.

Upstream issue:

https://bugs.python.org/issue32981

Comment 1 Huzaifa S. Sidhpurwala 2018-04-03 21:42:43 EDT

Created python3 tracking bugs for this issue:

Affects: fedora-all [bug 1563462]


Created python26 tracking bugs for this issue:

Affects: fedora-all [bug 1563464]


Created python33 tracking bugs for this issue:

Affects: fedora-all [bug 1563465]


Created python34 tracking bugs for this issue:

Affects: fedora-all [bug 1563463]


Created python35 tracking bugs for this issue:

Affects: fedora-all [bug 1563461]

Comment 2 Huzaifa S. Sidhpurwala 2018-04-03 21:56:23 EDT

External References:

https://docs.python.org/3.6/whatsnew/changelog.html#python-3-6-5-final

Comment 4 Huzaifa S. Sidhpurwala 2018-04-03 22:22:31 EDT

Acknowledgments:

Name: the Python security response team

Comment 5 errata-xmlrpc 2018-10-30 03:24:32 EDT

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:3041 https://access.redhat.com/errata/RHSA-2018:3041

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