Bug 1351168 – CVE-2016-5768 php: Double free in _php_mb_regex_ereg_replace_exec

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Bug 1351168 - (CVE-2016-5768) CVE-2016-5768 php: Double free in _php_mb_regex_ereg_replace_exec

Summary:	CVE-2016-5768 php: Double free in _php_mb_regex_ereg_replace_exec

Status:	NEW

Aliases:	CVE-2016-5768

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=20160623,reported=2...
Keywords:	Security

Depends On:	1351180 1356812
Blocks:	1323912 1351183
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Reported:	2016-06-29 07:49 EDT by Andrej Nemec
Modified:	2018-06-29 18:12 EDT (History)
CC List:	12 users (show)

See Also:
Fixed In Version:	php 5.5.37, php 5.6.23
Doc Type:	If docs needed, set a value
Doc Text:	A double free flaw was found in the mb_ereg_replace_callback() function of php which is used to perform regex search. This flaw could possibly cause a PHP application to crash.
Story Points:	---
Clone Of:
Environment:
Last Closed:
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-2016:2598	normal	SHIPPED_LIVE	Moderate: php security and bug fix update	2016-11-03 08:12:00 EDT
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 Andrej Nemec 2016-06-29 07:49:33 EDT

The _php_mb_regex_ereg_replace_exec when called by mb_ereg_replace_callback frees the description twice in case when callback execution failed (i.e. threw an exception).

Upstream bug:

https://bugs.php.net/bug.php?id=72402

Upstream patch:

http://git.php.net/?p=php-src.git;a=commitdiff;h=5b597a2e5b28e2d5a52fc1be13f425f08f47cb62

CVE assignment:

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

Comment 1 Andrej Nemec 2016-06-29 08:05:05 EDT

Created php tracking bugs for this issue:

Affects: fedora-all [bug 1351180]

Comment 2 Fedora Update System 2016-07-02 11:27:23 EDT

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 15:22:11 EDT

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 15:27:30 EDT

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 5 Huzaifa S. Sidhpurwala 2016-07-14 03:39:21 EDT

Analysis:

mb_ereg_replace_callback() is used to perform a regex search, the matched text is them replaced by output of the callback function. Script authors need to provide the callback function as the input to the function. In case the callback execution fails, (Most likely when the script author did not provide a proper callback), then a double-free takes places, causing php application crash.

Comment 7 errata-xmlrpc 2016-11-03 17:05:27 EDT

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2598 https://rhn.redhat.com/errata/RHSA-2016-2598.html

Comment 9 errata-xmlrpc 2016-11-15 06:41:37 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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