Bug 1332454 – CVE-2016-4343 php: Uninitialized pointer in phar_make_dirstream()

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Bug 1332454 - (CVE-2016-4343) CVE-2016-4343 php: Uninitialized pointer in phar_make_dirstream()

Summary:	CVE-2016-4343 php: Uninitialized pointer in phar_make_dirstream()

Status:	CLOSED ERRATA

Aliases:	CVE-2016-4343

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=20160110,repor...
Keywords:	Security

Depends On:	1332455
Blocks:	1305564
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Reported:	2016-05-03 05:01 EDT by Adam Mariš
Modified:	2016-11-15 09:31 EST (History)
CC List:	15 users (show)

See Also:
Fixed In Version:	php 5.6.18, php 7.0.3
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2016-10-12 08:58:50 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 2016-05-03 05:01:53 EDT

A missing variable initialization in phar_make_dirstream() and not properly checking return values when parsing malicious .tar file allows an attacker, that could control stack frame at the moment before calling zend_hash_get_current_key_ex(), to take over variables str_key and key_len and could cause a DoS or has other impact.

Upstream bug:

https://bugs.php.net/bug.php?id=71331

Upstream patch:

http://git.php.net/?p=php-src.git;a=commitdiff;h=9649ca1630433473a307d015ba1a79a4a7a779f5

CVE assignment:

http://seclists.org/oss-sec/2016/q2/163

Comment 1 Adam Mariš 2016-05-03 05:02:31 EDT

Created php tracking bugs for this issue:

Affects: fedora-all [bug 1332455]

Comment 3 Tomas Hoger 2016-10-12 08:58:50 EDT

This issue is triggered by a specially-crafted Tar format Phar files.  Phar files are distribution format for PHP applications (similar to Java Jar format) and their content is typically executed on the server.  Malicious Phar archive can therefore execute code on the system without exploiting any parsing issues.

If Phar extension is not used, it can be disabled by commenting out the following line:

  extension=phar.so

in /etc/php.d/phar.ini to prevent loading of the extension.

Comment 4 errata-xmlrpc 2016-11-15 06:51:30 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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