Bug 1419012 – CVE-2016-10162 php: Null pointer dereference when unserializing PHP object

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Bug 1419012 - (CVE-2016-10162) CVE-2016-10162 php: Null pointer dereference when unserializing PHP object

Summary:	CVE-2016-10162 php: Null pointer dereference when unserializing PHP object

Status:	CLOSED WONTFIX

Aliases:	CVE-2016-10162

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:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20170119,repor...
Keywords:	Security

Depends On:	1419021 1554540
Blocks:	1419023
	Show dependency tree / graph

Reported:	2017-02-03 07:25 EST by Adam Mariš
Modified:	2018-05-03 01:06 EDT (History)
CC List:	14 users (show)

See Also:
Fixed In Version:	php 5.6.30, php 7.0.15, php 7.1.1
Doc Type:	If docs needed, set a value
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2017-02-10 11:39:51 EST
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2018:1296	None	None	None	2018-05-03 01:06 EDT

Groups: None (edit)

Description Adam Mariš 2017-02-03 07:25:57 EST

The php_wddx_pop_element function in ext/wddx/wddx.c in PHP 7.0.x before 7.0.15 and 7.1.x before 7.1.1 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via an inapplicable class name in a wddxPacket XML document, leading to mishandling in a wddx_deserialize call.

Upstream bug:

https://bugs.php.net/bug.php?id=73831

Upstream patch:

https://github.com/php/php-src/commit/8d2539fa0faf3f63e1d1e7635347c5b9e777d47b

Comment 1 Adam Mariš 2017-02-03 07:50:23 EST

Created php tracking bugs for this issue:

Affects: fedora-all [bug 1419021]

Comment 2 Adam Mariš 2017-02-03 07:52:48 EST

This issue happens when untrusted input is unserialized. Doing so is 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 4 errata-xmlrpc 2018-05-03 01:06:16 EDT

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 7.3 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS

Via RHSA-2018:1296 https://access.redhat.com/errata/RHSA-2018:1296

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