Bug 1374705 (CVE-2016-7129)

Summary: CVE-2016-7129 php: wddx_deserialize allows illegal memory access
Product: [Other] Security Response Reporter: Martin Prpič <mprpic>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: abhgupta, dmcphers, fedora, hhorak, jialiu, jokerman, jorton, kseifried, lmeyer, mmccomas, rcollet, tiwillia, webstack-team, yozone
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Fixed In Version: php 5.6.25, php 7.0.10 Doc Type: If docs needed, set a value
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Clone Of: Environment:
Last Closed: 2016-10-20 05:19:52 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:    
Bug Blocks: 1374715    

Description Martin Prpič 2016-09-09 13:02:32 UTC 
The following flaw was found in PHP:

While deserializing an invalid dateTime value, wddx_deserialize will parse it in a wrong way and then assign the supplied value as the address of the created variable. This allows illegal memory access. We noted that the problem seems to happen because of the included \r inside the value of the dateTime.

Upstream bug:

https://bugs.php.net/bug.php?id=72749

Upstream patch:

https://github.com/php/php-src/commit/426aeb2808955ee3d3f52e0cfb102834cdb836a5?w=1
Comment 1 Huzaifa S. Sidhpurwala 2016-10-20 05:19:52 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 2 errata-xmlrpc 2016-11-15 11:45:38 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