Bug 1312337 – CVE-2016-9082 cairo: Out of bounds read in read_png/write_png in cairo-png.c

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Bug 1312337 - (CVE-2016-9082) CVE-2016-9082 cairo: Out of bounds read in read_png/write_png in cairo-png.c

Summary:	CVE-2016-9082 cairo: Out of bounds read in read_png/write_png in cairo-png.c

Status:	CLOSED WONTFIX

Aliases:	CVE-2016-9082

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=20161005,reported=2...
Keywords:	Security

Duplicates:	1382656 1382658 1382659 1382662 (view as bug list)
Depends On:	1384554 1384556 1384555
Blocks:	1312341 1382656 1382664
	Show dependency tree / graph

Reported:	2016-02-26 08:10 EST by Adam Mariš
Modified:	2017-04-06 05:13 EDT (History)
CC List:	18 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2016-10-19 15:58:58 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Backtrace report (1.35 KB, text/plain) 2016-02-26 08:14 EST, Adam Mariš	no flags	Details
Add an attachment (proposed patch, testcase, etc.)

Groups: None (edit)

Description Adam Mariš 2016-02-26 08:10:34 EST

It was found that specially crafted SVG file can trigger crash in png_write_row when converting the given SVG using librsvg2 and cairo. Crash happens inside libpng when trying to access invalid pointer.

Acknowledgements:

Name: Gustavo Grieco

Comment 1 Adam Mariš 2016-02-26 08:14 EST

Created attachment 1130832 [details]
Backtrace report

Comment 3 Adam Mariš 2016-10-13 06:17:21 EDT

*** Bug 1382656 has been marked as a duplicate of this bug. ***

Comment 4 Adam Mariš 2016-10-13 06:38:05 EDT

CVE request:

http://seclists.org/oss-sec/2016/q4/44

Upstream bug:

https://bugs.freedesktop.org/show_bug.cgi?id=98165

Comment 5 Adam Mariš 2016-10-13 10:21:05 EDT

Created cairo tracking bugs for this issue:

Affects: fedora-all [bug 1384554]

Comment 6 Adam Mariš 2016-10-13 10:21:17 EDT

Created mingw-cairo tracking bugs for this issue:

Affects: fedora-all [bug 1384555]
Affects: epel-7 [bug 1384556]

Comment 7 Stefan Cornelius 2016-10-19 15:54:29 EDT

The upstream bug mentions a separate issue that may cause out-of-bounds writes. While this looks correct initially, I don't think that this is feasible:
The memory is allocated using _cairo_malloc_ab(), which has a built-in overflow check. As far as I can tell, this will catch the problem before we can reach the problematic code.

This leaves only the out-of-bounds read, which, all things considered, isn't really that dangerous.

Comment 8 Paul Howarth 2016-10-21 06:17:11 EDT

*** Bug 1382658 has been marked as a duplicate of this bug. ***

Comment 9 Paul Howarth 2016-10-21 06:18:31 EDT

*** Bug 1382659 has been marked as a duplicate of this bug. ***

Comment 10 Paul Howarth 2016-10-21 06:20:10 EDT

*** Bug 1382662 has been marked as a duplicate of this bug. ***

Comment 11 Adam Mariš 2016-10-27 07:26:23 EDT

Proposed patch:

https://bugs.freedesktop.org/attachment.cgi?id=127421

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