Bug 1339949 – CVE-2016-5096 php: Integer underflow causing arbitrary null write in fread/gzread

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Bug 1339949 - (CVE-2016-5096) CVE-2016-5096 php: Integer underflow causing arbitrary null write in fread/gzread

Summary:	CVE-2016-5096 php: Integer underflow causing arbitrary null write in fread/gz...

Status:	CLOSED ERRATA

Aliases:	CVE-2016-5096

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=low,public=20160427,reported=2...
Keywords:	Security

Depends On:	1339950
Blocks:	1339953
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Reported:	2016-05-26 05:04 EDT by Adam Mariš
Modified:	2016-11-15 09:38 EST (History)
CC List:	13 users (show)

See Also:
Fixed In Version:	php 5.5.36, php 5.6.22
Doc Type:	If docs needed, set a value
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2016-06-07 07:34:42 EDT
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-2016:2750	normal	SHIPPED_LIVE	Moderate: rh-php56 security, bug fix, and enhancement update	2016-11-15 11:40:02 EST

Groups: None (edit)

Description Adam Mariš 2016-05-26 05:04:56 EDT

An integer underflow resulting into arbitrary null character write in fread/gzread function was found.

Upstream bug:

https://bugs.php.net/bug.php?id=72114

Upstream patch:

https://git.php.net/?p=php-src.git;a=commit;h=abd159cce48f3e34f08e4751c568e09677d5ec9c

CVE request:

http://seclists.org/oss-sec/2016/q2/404

Comment 1 Adam Mariš 2016-05-26 05:08:33 EDT

Created php tracking bugs for this issue:

Affects: fedora-all [bug 1339950]

Comment 2 Fedora Update System 2016-05-29 18:21:17 EDT

php-5.6.22-1.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 3 Fedora Update System 2016-05-30 17:20:44 EDT

php-5.6.22-1.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.

Comment 4 Fedora Update System 2016-06-03 11:21:44 EDT

php-5.6.22-1.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 5 Tomas Hoger 2016-06-07 07:34:42 EDT

This problem occurs when fread or gzread are called with excessively large $length argument value (above 2GB / 2^31).  Additionally, this flaw can only be triggered when PHP is running with no memory limit, or its memory limit exceeds 2GB.  The default configuration of PHP packages in Red Hat products sets memory_limit to 128M, completely blocking this issue.

This issue can be mitigated by ensuring memory_limit is set and its value does not exceed 2GB.

Comment 6 errata-xmlrpc 2016-11-15 06:53:15 EST

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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