Bug 1351173 (CVE-2016-5771) - CVE-2016-5771 php: Use After Free Vulnerability in PHP's GC algorithm and unserialize
Summary: CVE-2016-5771 php: Use After Free Vulnerability in PHP's GC algorithm and uns...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2016-5771
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1351180
Blocks: 1351183
TreeView+ depends on / blocked
 
Reported: 2016-06-29 11:57 UTC by Andrej Nemec
Modified: 2019-11-14 08:33 UTC (History)
14 users (show)

Fixed In Version: php 5.5.37, php 5.6.23
Doc Type: If docs needed, set a value
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Clone Of:
Environment:
Last Closed: 2016-07-27 05:35:20 UTC


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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2016:2750 0 normal SHIPPED_LIVE Moderate: rh-php56 security, bug fix, and enhancement update 2016-11-15 16:40:02 UTC

Description Andrej Nemec 2016-06-29 11:57:49 UTC
A  use after free vulnerability was discovered when PHP's garbage collection algorithm interacts with other specific PHP objects. This vulnerability has wide reaching effects like allowing the exploitation of unserialize to gain remote code execution on a target system.

Upstream bug:

https://bugs.php.net/bug.php?id=72433

Upstream patch:

http://git.php.net/?p=php-src.git;a=commitdiff;h=3f627e580acfdaf0595ae3b115b8bec677f203ee

CVE assignment:

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

Comment 1 Andrej Nemec 2016-06-29 12:05:21 UTC
Created php tracking bugs for this issue:

Affects: fedora-all [bug 1351180]

Comment 2 Fedora Update System 2016-07-02 15:27:08 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 19:21:57 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 19:27:16 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 7 Huzaifa S. Sidhpurwala 2016-07-27 05:35:20 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 Tomas Hoger 2016-07-27 12:51:14 UTC
More details about this issue can be found in:

https://www.evonide.com/breaking-phps-garbage-collection-and-unserialize/

Comment 9 errata-xmlrpc 2016-11-15 11:41:57 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


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