Bug 1487552 (CVE-2017-14064)

Summary:	CVE-2017-14064 ruby: Arbitrary heap exposure during a JSON.generate call
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	bkearney, cbillett, ccoleman, cpelland, dajohnso, dclarizi, dedgar, dmcphers, gblomqui, gmccullo, gtanzill, hhorak, hhudgeon, jfrey, jgoulding, jhardy, jorton, jprause, kseifried, mmorsi, mtasaka, obarenbo, roliveri, ruby-maint, simaishi, s, strzibny, tomckay, vanmeeuwen+fedora, vondruch
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	ruby 2.4.2, ruby 2.3.5, ruby 2.2.8	Doc Type:	If docs needed, set a value
Doc Text:	A buffer overflow vulnerability was found in the JSON extension of ruby. An attacker with the ability to pass a specially crafted JSON input to the extension could use this flaw to expose the interpreter's heap memory.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-12-19 17:08:26 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:	1487553, 1487554, 1489642, 1489643, 1489644, 1489645, 1509450, 1509451, 1534437, 1534438, 1534937, 1534938, 1534940, 1534941
Bug Blocks:	1487556

Description Adam Mariš 2017-09-01 09:08:12 UTC

Ruby through 2.2.7, 2.3.x through 2.3.4, and 2.4.x through 2.4.1 can
expose arbitrary memory during a JSON.generate call. The issues lies in
using strdup in ext/json/ext/generator/generator.c, which will stop
after encountering a '\0' byte, returning a pointer to a string of
length zero, which is not the length stored in space_len.

Upstream patch:

https://github.com/flori/json/commit/8f782fd8e181d9cfe9387ded43a5ca9692266b85

References:

https://bugs.ruby-lang.org/issues/13853
https://hackerone.com/reports/209949

Comment 1 Adam Mariš 2017-09-01 09:08:30 UTC

Created ruby tracking bugs for this issue:

Affects: fedora-all [bug 1487553]


Created ruby193-ruby tracking bugs for this issue:

Affects: openshift-1 [bug 1487554]

Comment 2 Doran Moppert 2017-09-06 04:26:39 UTC

This is triggered by passing a string containing \0 in the "opts" argument to JSON.generate - the object being serialised cannot cause memory disclosure to occur.  Normally, this argument can not be influenced by users or potential attackers.

Comment 4 Adam Mariš 2017-09-15 09:21:20 UTC

External References:

https://www.ruby-lang.org/en/news/2017/09/14/json-heap-exposure-cve-2017-14064/

Comment 7 errata-xmlrpc 2017-12-19 08:37:26 UTC

This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 6
  Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS

Via RHSA-2017:3485 https://access.redhat.com/errata/RHSA-2017:3485

Comment 8 Cedric Buissart 2017-12-19 17:06:53 UTC

Statement:

This issue did not affect the versions of ruby as shipped with Red Hat Enterprise Linux 5, and 6. These versions do not include the JSON module.

This issue affects the versions of ruby as shipped with Red Hat Enterprise Linux 7, as well as the versions of rh-ruby22-ruby and rh-ruby23-ruby as shipped with Red Hat Software Collections. Red Hat Product Security has rated this issue as having Low security impact. A future update may address this issue. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.

Comment 10 errata-xmlrpc 2018-02-28 20:01:21 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:0378 https://access.redhat.com/errata/RHSA-2018:0378

Comment 13 errata-xmlrpc 2018-03-26 09:43:07 UTC

This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 6
  Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS

Via RHSA-2018:0583 https://access.redhat.com/errata/RHSA-2018:0583

Comment 14 errata-xmlrpc 2018-03-26 10:21:17 UTC

This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 6
  Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS

Via RHSA-2018:0585 https://access.redhat.com/errata/RHSA-2018:0585