Bug 1323106 – CVE-2016-4072 php: Invalid memory write in phar on filename containing \0 inside name

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Bug 1323106 - (CVE-2016-4072) CVE-2016-4072 php: Invalid memory write in phar on filename containing \0 inside name

Summary:	CVE-2016-4072 php: Invalid memory write in phar on filename containing \0 ins...

Status:	CLOSED WONTFIX

Aliases:	CVE-2016-4072

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=20160319,repor...
Keywords:	Security

Depends On:	1323111
Blocks:	1323121
	Show dependency tree / graph

Reported:	2016-04-01 06:03 EDT by Adam Mariš
Modified:	2017-11-09 04:09 EST (History)
CC List:	17 users (show)

See Also:
Fixed In Version:	php 5.5.34, php 5.6.20, php 7.0.5
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2017-06-23 07:03:42 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 2016-04-01 06:03:15 EDT

An invalid write vulnerability causing segmentation fault in phar on filename with \0 inside its name was found.

Vulnerable code (phar_analyze_path):

				if (!(realpath = expand_filepath(filename, NULL))) {
					efree(filename);
					return FAILURE;
				}
#ifdef PHP_WIN32
				phar_unixify_path_separators(realpath, strlen(realpath));
#endif
				slash = strstr(realpath, filename);
				if (slash) {
					slash += ((ext - fname) + ext_len);
					*slash = '\0';
				}

If fname and thus filename contain \0's, realpath would not contain those parts and thus slash would point past the end of the realpath buffer.

To exploit this, application has to allow attacker to create phar files with arbitrary filenames.

Upstream bug:

https://bugs.php.net/bug.php?id=71860

Upstream patch:

https://gist.github.com/smalyshev/80b5c2909832872f2ba2
https://git.php.net/?p=php-src.git;a=commit;h=1e9b175204e3286d64dfd6c9f09151c31b5e099a

Comment 1 Adam Mariš 2016-04-01 06:10:45 EDT

Created php tracking bugs for this issue:

Affects: fedora-all [bug 1323111]

Comment 2 Fedora Update System 2016-04-09 10:21:11 EDT

php-5.6.20-1.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 3 Fedora Update System 2016-04-09 10:22:40 EDT

php-5.6.20-1.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 errata-xmlrpc 2016-11-15 06:50:36 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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