Bug 1332877 (CVE-2016-4539)

Summary:	CVE-2016-4539 php: xml_parse_into_struct() can crash when XML parser is re-used
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:	abhgupta, dmcphers, fedora, jialiu, jokerman, jorton, kseifried, lmeyer, mmaslano, mmccomas, rcollet, tiwillia, webstack-team, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	php 5.5.35, php 5.6.21, php 7.0.6	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-06-13 13:17:14 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:	1332882
Bug Blocks:	1332879

Description Adam Mariš 2016-05-04 09:19:44 UTC

It was found that crafted input to xml_parse_into_struct() function can cause segmentation fault.

Upstream bug:

https://bugs.php.net/bug.php?id=72099

Upstream patch:

https://git.php.net/?p=php-src.git;a=commit;h=1248079be837808da4c97364fb3b4c96c8015fbf

Comment 1 Adam Mariš 2016-05-04 09:26:05 UTC

Created php tracking bugs for this issue:

Affects: fedora-all [bug 1332882]

Comment 2 Andrej Nemec 2016-05-06 06:55:26 UTC

CVE assignment:

http://seclists.org/oss-sec/2016/q2/259

Comment 3 Fedora Update System 2016-05-07 11:47:23 UTC

php-5.6.21-1.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.

Comment 4 Fedora Update System 2016-05-12 07:22:24 UTC

php-5.6.21-1.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 5 Tomas Hoger 2016-06-13 13:17:14 UTC

It only seems possible to trigger this problem if xml_parse_into_struct() is called with parser that was previously used for XML parsing.  As XML parser is not safe to be reused for multiple XML parsings (parser needs to be freed and new created if multiple XML inputs need to be parsed), this flaw is unlikely to affect properly written PHP scripts.

This issue is in the xml extension.  In Red Hat products, this extension is packaged separately in php-xml sub-RPM.  Systems without that package installed can not be affected by this issue.

Comment 6 errata-xmlrpc 2016-11-15 11:52:05 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 7.2 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS

Via RHSA-2016:2750 https://rhn.redhat.com/errata/RHSA-2016-2750.html