Bug 1329106 (CVE-2015-8853)

Summary:	CVE-2015-8853 perl: regexp matching hangs indefinitely on illegal UTF-8 input
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	carnil, cweyl, iarnell, jorton, jplesnik, kasal, mmaslano, perl-devel, perl-maint-list, ppisar, psabata, rc040203, rmeggins, sardella, slawomir, tcallawa
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	perl 5.22.1	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-04-25 11:45:30 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Bug Depends On:	1329107
Bug Blocks:	1329108

Description Andrej Nemec 2016-04-21 08:41:38 UTC

A vulnerability was found in perl. The regex engine got into an infinite loop because of the malformation. It is trying to back-up over a sequence of UTF-8 continuation bytes. The character just before the sequence should be a start byte. If it's not, there is a malformation which results in "hang" of regexp matching and CPU exhaustion.

External references:

https://rt.perl.org/Public/Bug/Display.html?id=123562

Upstream fix:

http://perl5.git.perl.org/perl.git/commitdiff/22b433eff9a1ffa2454e18405a56650f07b385b5

Comment 1 Andrej Nemec 2016-04-21 08:42:07 UTC

Created perl tracking bugs for this issue:

Affects: fedora-22 [bug 1329107]

Comment 2 Stefan Cornelius 2016-04-25 11:45:30 UTC

Statement:

Red Hat Product Security has rated this issue as having Moderate security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.

Comment 3 Fedora Update System 2016-05-06 19:51:59 UTC

perl-5.20.3-330.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.