Bug 1377303 – CVE-2016-7411 php: Memory corruption when destructing deserialized object

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Bug 1377303 - (CVE-2016-7411) CVE-2016-7411 php: Memory corruption when destructing deserialized object

Summary:	CVE-2016-7411 php: Memory corruption when destructing deserialized object

Status:	CLOSED WONTFIX

Aliases:	CVE-2016-7411

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:
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URL:
Whiteboard:	impact=moderate,public=20160909,repor...
Keywords:	Security

Depends On:	1377366
Blocks:	1377365
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Reported:	2016-09-19 08:04 EDT by Adam Mariš
Modified:	2016-10-13 06:18 EDT (History)
CC List:	14 users (show)

See Also:
Fixed In Version:	php 5.6.26
Doc Type:	If docs needed, set a value
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Environment:
Last Closed:	2016-10-12 05:09:36 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Adam Mariš 2016-09-19 08:04:22 EDT

It was found that if object deserialization fails, object's properties will be cleaned, but the object will still remain stored in objects_store. When calling desctructor with uninitialized properties, memory corruption may happen.

Upstream bug:

https://bugs.php.net/bug.php?id=73052

Upstream patch:

https://github.com/php/php-src/commit/6a7cc8ff85827fa9ac715b3a83c2d9147f33cd43?w=1

CVE assignment:

http://seclists.org/oss-sec/2016/q3/518

Comment 1 Adam Mariš 2016-09-19 09:37:07 EDT

Created php tracking bugs for this issue:

Affects: fedora-all [bug 1377366]

Comment 2 Huzaifa S. Sidhpurwala 2016-10-12 05:09:36 EDT

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.

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