Bug 1646738 (CVE-2018-18313)

Summary:	CVE-2018-18313 perl: Heap-based buffer read overflow in S_grok_bslash_N()
Product:	[Other] Security Response	Reporter:	Laura Pardo <lpardo>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	abhgupta, ahardin, bleanhar, caillon+fedoraproject, ccoleman, dbaker, dedgar, dmoppert, eparis, hhorak, iarnell, jgoulding, jokerman, jorton, jplesnik, kasal, mbarnes, mchappel, mmaslano, perl-devel, perl-maint-list, ppisar, psabata, rhughes, sandmann, security-response-team, sthangav, tcallawa, trankin, ylavi
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	perl 5.26.3, perl 5.28.1	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-10 10:42:16 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:	1653525, 1653526, 1654921, 1654924, 1656293, 1660192, 1660195
Bug Blocks:	1646752

Description Laura Pardo 2018-11-05 22:47:38 UTC

A flaw was found in Perl versions 5.22 through 5.26. Heap-buffer-overflow read in regcomp.c


Upstream Patch:
https://github.com/Perl/perl5/commit/43b2f4ef399e2fd7240b4eeb0658686ad95f8e62

Comment 1 Doran Moppert 2018-11-23 03:57:54 UTC

Upstream ticket:

https://rt.perl.org/Public/Bug/Display.html?id=133192

Comment 4 Doran Moppert 2018-11-27 01:57:56 UTC

Downgrading severity based on:

 - significant control over a regex gives a number of vectors to deny service, if not evaluate code
 - information disclosure potential is through error messages, which should not be disclosed to attackers from secure systems

Comment 6 Doran Moppert 2018-11-27 03:47:48 UTC

Acknowledgments:

Name: the Perl project
Upstream: Eiichi Tsukata

Comment 7 Doran Moppert 2018-11-30 03:18:38 UTC

Created perl tracking bugs for this issue:

Affects: fedora-all [bug 1654921]

Comment 9 errata-xmlrpc 2019-01-02 13:29:32 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 7.4 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS

Via RHSA-2019:0001 https://access.redhat.com/errata/RHSA-2019:0001

Comment 10 errata-xmlrpc 2019-01-02 16:13:23 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 7.4 EUS
  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 6

Via RHSA-2019:0010 https://access.redhat.com/errata/RHSA-2019:0010

Comment 11 Paul Harvey 2019-01-25 13:05:58 UTC

openshift-enterprise-3: notaffected. I reviewed OpenShift containers for applications with dependencies on perl and was unable to identify any where the perl interpreter would be exposed to attacker-controlled regular expressions which could expose this flaw. There is a perl dependency in our MariaDB packaging, however the only non-test related perl usage is in a backup script (mysqlhotcopy) which is not exposed to attacker-controlled regular expressions. I have not filed trackers as these images will inherit the existing perl fixes next time they are respun. See also https://access.redhat.com/articles/2803031