Bug 1351175 (CVE-2016-5772)

Summary:	CVE-2016-5772 php: Double Free Corruption in wddx_deserialize
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
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, hhorak, jialiu, jokerman, jorton, kseifried, lmeyer, mmccomas, rcollet, sardella, tiwillia, webstack-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	php 5.5.37, php 5.6.23	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-07-27 05:35:43 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:	1351180
Bug Blocks:	1351183

Description Andrej Nemec 2016-06-29 12:00:22 UTC

A double free can occur in wddx_deserialize when trying to deserialize malicious xml input from user's request.

Upstream bug:

https://bugs.php.net/bug.php?id=72340

Upstream patch:

http://git.php.net/?p=php-src.git;a=commitdiff;h=a44c89e8af7c2410f4bfc5e097be2a5d0639a60c

CVE assignment:

http://seclists.org/oss-sec/2016/q2/589

Comment 1 Andrej Nemec 2016-06-29 12:05:29 UTC

Created php tracking bugs for this issue:

Affects: fedora-all [bug 1351180]

Comment 2 Fedora Update System 2016-07-02 15:27:00 UTC

php-5.6.23-1.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.

Comment 3 Fedora Update System 2016-07-02 19:21:49 UTC

php-5.6.23-1.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 4 Fedora Update System 2016-07-02 19:27:09 UTC

php-5.6.23-1.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 5 Huzaifa S. Sidhpurwala 2016-07-15 05:43:31 UTC

Analysis:

Double-free flaw when you try to de-serialize user-supplied (possibly malicious) xml file.

Comment 7 Huzaifa S. Sidhpurwala 2016-07-27 05:35:43 UTC

This issue happens when untrusted input is unserialized.  Doing so it documented as being unsafe:

  http://php.net/manual/en/function.unserialize.php

  Do not pass untrusted user input to unserialize(). Unserialization can
  result in code being loaded and executed due to object instantiation and
  autoloading, and a malicious user may be able to exploit this. Use a safe,
  standard data interchange format such as JSON (via json_decode() and
  json_encode()) if you need to pass serialized data to the user.

Comment 8 errata-xmlrpc 2016-11-15 11:42:08 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