Bug 1359718 – CVE-2016-6291 php: Out-of-bounds access in exif_process_IFD_in_MAKERNOTE

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Bug 1359718 - (CVE-2016-6291) CVE-2016-6291 php: Out-of-bounds access in exif_process_IFD_in_MAKERNOTE

Summary:	CVE-2016-6291 php: Out-of-bounds access in exif_process_IFD_in_MAKERNOTE

Status:	CLOSED ERRATA

Aliases:	CVE-2016-6291

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=20160715,repor...
Keywords:	Security

Depends On:	1359837
Blocks:	1359830
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Reported:	2016-07-25 06:49 EDT by Adam Mariš
Modified:	2016-11-15 10:11 EST (History)
CC List:	13 users (show)

See Also:
Fixed In Version:	php 5.5.38, php 5.6.24, php 7.0.9
Doc Type:	If docs needed, set a value
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2016-09-26 15:59:56 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
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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 2016-07-25 06:49:05 EDT

An out-of-bounds access due to lack of size check of buffer may lead to memory buffer overflow.

Upstream bug:

https://bugs.php.net/bug.php?id=72603

Upstream patch:

http://git.php.net/?p=php-src.git;a=commit;h=eebcbd5de38a0f1c2876035402cb770e37476519

CVE assignment:

http://seclists.org/oss-sec/2016/q3/137

Comment 1 Adam Mariš 2016-07-25 10:12:34 EDT

Created php tracking bugs for this issue:

Affects: fedora-all [bug 1359837]

Comment 2 Huzaifa S. Sidhpurwala 2016-08-05 02:06:41 EDT

Analysis:

In the affected code snippet:

offset_diff = 2 + NumDirEntries*12 + 4 - php_ifd_get32u(dir_start+10, ImageInfo->motorola_intel);

The output from the php_ifd_get32u() function and the NumDirEntries are attacker controlled, via a specially-crafted JPG image. This results in offset_diff being controlled by the user. Later in the code offset_diff is used to read the IFD tag, which could ultimately lead to OOB Read.

For successful exploitation, a specially crafted JPG image, needs to be read by the PHP script, via exif_read_data() function.

Comment 3 Remi Collet 2016-08-05 02:12:13 EDT

For memory, the recent exif CVE introduce a regression in MakerNote parser.

Regression fixed in:

http://git.php.net/?p=php-src.git;a=commitdiff;h=d5796fb298abb2a3e389818ad924589fa35e58b9

http://git.php.net/?p=php-src.git;a=commitdiff;h=9667ee4f72c7dafce993b71104a52beb7c3aff15

Comment 4 errata-xmlrpc 2016-11-15 06:43:29 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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