Bug 1332860 – CVE-2016-4537 CVE-2016-4538 php: bcpowmod accepts negative scale causing heap buffer overflow corrupting _one_ definition

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Bug 1332860 - (CVE-2016-4537, CVE-2016-4538) CVE-2016-4537 CVE-2016-4538 php: bcpowmod accepts negative scale causing heap buffer overflow corrupting _one_ definition

Summary:	CVE-2016-4537 CVE-2016-4538 php: bcpowmod accepts negative scale causing heap...

Status:	CLOSED ERRATA

Aliases:	CVE-2016-4537, CVE-2016-4538

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=20160424,reported=2...
Keywords:	Security

Depends On:	1332882
Blocks:	1332879
	Show dependency tree / graph

Reported:	2016-05-04 04:49 EDT by Adam Mariš
Modified:	2016-11-15 09:31 EST (History)
CC List:	14 users (show)

See Also:
Fixed In Version:	php 5.5.35, php 5.6.21, php 7.0.6
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2016-06-13 06:36:34 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 2016-05-04 04:49:38 EDT

It was found that bcpowmod accepts negative scale causing heap buffer overflow, which corrupts _one_ definition.

Upstream bug:

https://bugs.php.net/bug.php?id=72093

Upstream patch:

https://git.php.net/?p=php-src.git;a=commit;h=ed52bcb3dcb2e7dbc009ef8c6579fb1276ca73c1

Comment 1 Adam Mariš 2016-05-04 05:25:41 EDT

Created php tracking bugs for this issue:

Affects: fedora-all [bug 1332882]

Comment 2 Andrej Nemec 2016-05-06 02:50:34 EDT

As per CVE assignment:

http://seclists.org/oss-sec/2016/q2/259

Use CVE-2016-4537 for "bcpowmod accepting negative scale."

Use CVE-2016-4538 for "_one_ definition being overridden by scale adjustment."

Comment 3 Fedora Update System 2016-05-07 07:47:45 EDT

php-5.6.21-1.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 2016-05-12 03:22:48 EDT

php-5.6.21-1.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 2016-06-13 06:36:34 EDT

Issue is triggered by a negative $scale, which is not likely to come from an untrusted source, making this hard to trigger other way than by a malicious script.

This issue is in the bcmath extension.  In Red Hat products, this extension is packaged separately in php-bcmath sub-RPM.  Systems without that package installed can not be affected by this issue.

Comment 6 errata-xmlrpc 2016-11-15 06:51:39 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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