Bug 646684 (CVE-2010-3710)

Summary:	CVE-2010-3710 php: DoS in filter_var() via long email string
Product:	[Other] Security Response	Reporter:	Vincent Danen <vdanen>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	fedora, jorton, rpm
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-02-04 09:06:40 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:	646688, 651953, 670463, 670464
Bug Blocks:

Description Vincent Danen 2010-10-25 22:05:53 UTC

Common Vulnerabilities and Exposures assigned an identifier CVE-2010-3710 to
the following vulnerability:

Name: CVE-2010-3710
URL: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3710
Assigned: 20101001
Reference: CONFIRM: http://bugs.php.net/bug.php?id=52929

Stack consumption vulnerability in the filter_var function in PHP
5.2.x through 5.2.14 and 5.3.x through 5.3.3, when
FILTER_VALIDATE_EMAIL mode is used, allows remote attackers to cause a
denial of service (memory consumption and application crash) via a
long e-mail address string.

Comment 1 Vincent Danen 2010-10-25 22:13:55 UTC

Upstream fix is here: http://svn.php.net/viewvc/?view=revision&amp;revision=303779

filter_var() was introduced in PHP 5.2.0 so this does not affect versions of PHP prior to that.

Comment 3 Vincent Danen 2010-10-25 22:24:25 UTC

Created php tracking bugs for this issue

Affects: fedora-all [bug 646688]

Comment 6 Vincent Danen 2010-12-10 21:20:32 UTC

This was corrected in upstream 5.3.4.

Comment 9 Tomas Hoger 2011-01-18 18:19:32 UTC

What happens here is stack overflow caused by deep recursion in the PCRE regular expression engine, when long input is compared to a "valid email address" regular expression.  This regular expression was changed in between PHP versions 5.3.2 and 5.3.3:
  http://svn.php.net/viewvc?view=revision&revision=297350
  http://bugs.php.net/49576

This issue does not occur with the previously used regular expression.  Hence only php53 packages introduced in Red Hat Enterprise Linux 5.6 were affected.

Comment 10 errata-xmlrpc 2011-02-03 19:17:06 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2011:0196 https://rhn.redhat.com/errata/RHSA-2011-0196.html

Comment 11 Vincent Danen 2011-02-03 19:32:56 UTC

Statement:

This issue did not affect the version of php packages as shipped with Red Hat Enterprise Linux 4, 5 or 6.  It  did affect the PHP 5.3 (php53) package on Red Hat Enterprise Linux 5.