Bug 1664509 (CVE-2018-20406)

Summary:	CVE-2018-20406 python: Integer overflow in Modules/_pickle.c allows for memory exhaustion if serializing gigabytes of data
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	cstratak, hhorak, jorton, mhroncok, psampaio, python-maint
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	python 3.7.1	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-11-06 12:51:09 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:	1664510, 1664511, 1664512, 1664513, 1664514, 1664515, 1664516, 1664517, 1670062, 1670063, 1670064, 1670065, 1670066, 1709350
Bug Blocks:	1664518

Description Sam Fowler 2019-01-09 03:46:05 UTC

Modules/_pickle.c in Python before 3.7.1 has an integer overflow via a large LONG_BINPUT value that is mishandled during a "resize to twice the size" attempt. This issue might cause memory exhaustion, but is only relevant if the pickle format is used for serializing tens or hundreds of gigabytes of data.


Upstream Issue:

https://bugs.python.org/issue34656


Upstream Patch:

https://github.com/python/cpython/commit/a4ae828ee416a66d8c7bf5ee71d653c2cc6a26dd


Reference:

http://people.canonical.com/~ubuntu-security/cve/2018/CVE-2018-20406.html

Comment 1 Sam Fowler 2019-01-09 03:46:50 UTC

Created python3 tracking bugs for this issue:

Affects: fedora-all [bug 1664510]


Created python33 tracking bugs for this issue:

Affects: fedora-28 [bug 1664515]


Created python34 tracking bugs for this issue:

Affects: epel-all [bug 1664516]
Affects: fedora-all [bug 1664511]


Created python35 tracking bugs for this issue:

Affects: fedora-all [bug 1664512]


Created python36 tracking bugs for this issue:

Affects: epel-7 [bug 1664517]
Affects: fedora-29 [bug 1664513]


Created python37 tracking bugs for this issue:

Affects: fedora-28 [bug 1664514]

Comment 3 Adam Mariš 2019-02-12 13:56:29 UTC

Statement:

This issue did not affect the versions of python as shipped with Red Hat Enterprise Linux 5, 6 and 7.

Comment 4 Adam Mariš 2019-02-12 13:56:31 UTC

External References:

https://python-security.readthedocs.io/vuln/pickle-load-dos.html

Comment 5 errata-xmlrpc 2019-11-06 09:45:15 UTC

This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 6

Via RHSA-2019:3725 https://access.redhat.com/errata/RHSA-2019:3725

Comment 6 Product Security DevOps Team 2019-11-06 12:51:09 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2018-20406