Bug 1329106 – CVE-2015-8853 perl: regexp matching hangs indefinitely on illegal UTF-8 input

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Bug 1329106 - (CVE-2015-8853) CVE-2015-8853 perl: regexp matching hangs indefinitely on illegal UTF-8 input

Summary:	CVE-2015-8853 perl: regexp matching hangs indefinitely on illegal UTF-8 input

Status:	CLOSED WONTFIX

Aliases:	CVE-2015-8853

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=20150107,repor...
Keywords:	Security

Depends On:	1329107
Blocks:	1329108
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Reported:	2016-04-21 04:41 EDT by Andrej Nemec
Modified:	2016-05-11 10:21 EDT (History)
CC List:	16 users (show)

See Also:
Fixed In Version:	perl 5.22.1
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2016-04-25 07:45:30 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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Description Andrej Nemec 2016-04-21 04:41:38 EDT

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 04:42:07 EDT

Created perl tracking bugs for this issue:

Affects: fedora-22 [bug 1329107]

Comment 2 Stefan Cornelius 2016-04-25 07:45:30 EDT

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 15:51:59 EDT

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.

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