Bug 1404731 – CVE-2016-9935 php: Invalid read when wddx decodes empty boolean element

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Bug 1404731 - (CVE-2016-9935) CVE-2016-9935 php: Invalid read when wddx decodes empty boolean element

Summary:	CVE-2016-9935 php: Invalid read when wddx decodes empty boolean element

Status:	CLOSED WONTFIX

Aliases:	CVE-2016-9935

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=20161208,repor...
Keywords:	Security

Depends On:	1404737 1554854
Blocks:	1404738
	Show dependency tree / graph

Reported:	2016-12-14 09:07 EST by Adam Mariš
Modified:	2018-05-03 01:05 EDT (History)
CC List:	18 users (show)

See Also:
Fixed In Version:	php 5.6.29, php 7.0.14
Doc Type:	If docs needed, set a value
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2017-02-21 03:56:13 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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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2018:1296	None	None	None	2018-05-03 01:05 EDT

Groups: None (edit)

Description Adam Mariš 2016-12-14 09:07:45 EST

An invalid read occurs when wddx decodes empty boolean element, leading to arbitrary memory read or crash.

Upstream bug:

https://bugs.php.net/bug.php?id=73631

Upstream patch:

https://github.com/php/php-src/commit/66fd44209d5ffcb9b3d1bc1b9fd8e35b485040c0

CVE assignment:

http://seclists.org/oss-sec/2016/q4/658

Comment 1 Adam Mariš 2016-12-14 09:18:47 EST

Created php tracking bugs for this issue:

Affects: fedora-all [bug 1404737]

Comment 4 Cedric Buissart 2017-02-20 11:15:45 EST

This issue happens when untrusted input is unserialized. Doing so is documented as being unsafe:
http://php.net/manual/en/function.wddx-deserialize.php#refsect1-function.wddx-deserialize-notes

Warning
Do not pass untrusted user input to wddx_deserialize(). 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.

Comment 6 errata-xmlrpc 2018-05-03 01:05:41 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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