Bug 1332454 (CVE-2016-4343)

Summary:	CVE-2016-4343 php: Uninitialized pointer in phar_make_dirstream()
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abhgupta, dmcphers, fedora, hkim, jialiu, jokerman, jorton, kseifried, lmeyer, mdshaikh, mmaslano, mmccomas, rcollet, tiwillia, webstack-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
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 12:58:50 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1332455
Bug Blocks:	1305564

Description Adam Mariš 2016-05-03 09:01:53 UTC

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 09:02:31 UTC

Created php tracking bugs for this issue:

Affects: fedora-all [bug 1332455]

Comment 3 Tomas Hoger 2016-10-12 12:58:50 UTC

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 11:51:30 UTC

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