Bug 1359756 – CVE-2016-6292 php: Null pointer dereference in exif_process_user_comment

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Bug 1359756 - (CVE-2016-6292) CVE-2016-6292 php: Null pointer dereference in exif_process_user_comment

Summary:	CVE-2016-6292 php: Null pointer dereference in exif_process_user_comment

Status:	CLOSED ERRATA

Aliases:	CVE-2016-6292

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=20160719,reported=2...
Keywords:	Security

Depends On:	1359837
Blocks:	1359830
	Show dependency tree / graph

Reported:	2016-07-25 08:08 EDT by Adam Mariš
Modified:	2016-11-15 10:11 EST (History)
CC List:	14 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 15:36:37 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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Add an attachment (proposed patch, testcase, etc.)

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 08:08:55 EDT

Null pointer dereference vulnerability was found in exif_process_user_comment when trying to encode JIS string.

Upstream bug:

https://bugs.php.net/bug.php?id=72618

Upstream patch:

http://git.php.net/?p=php-src.git;a=commit;h=41131cd41d2fd2e0c2f332a27988df75659c42e4

CVE assignment:

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

Comment 1 Adam Mariš 2016-07-25 10:12:24 EDT

Created php tracking bugs for this issue:

Affects: fedora-all [bug 1359837]

Comment 2 Huzaifa S. Sidhpurwala 2016-08-05 02:16:50 EDT

Analysis:

mbfl_buffer_converter_new2() is passed null strings, due to a specially-crafted JPG image. Later when the string is processed, it results in null pointer deref and a crash. 

Similar to CVE-2016-6291, exploitation requires a specially-crafted JPEG image, being processed by the PHP script.

Comment 4 errata-xmlrpc 2016-11-15 06:43:38 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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