Bug 1325090 (CVE-2016-3624) - CVE-2016-3624 libtiff: out of bounds write in the rgb2ycybr tool
Summary: CVE-2016-3624 libtiff: out of bounds write in the rgb2ycybr tool
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2016-3624
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks: 1316881
TreeView+ depends on / blocked
 
Reported: 2016-04-08 08:09 UTC by Andrej Nemec
Modified: 2019-09-29 13:46 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2017-05-11 10:18:09 UTC


Attachments (Terms of Use)

Description Andrej Nemec 2016-04-08 08:09:17 UTC
Out of bounds write vulnerability was found in cvtClump function in rgb2ycybr.c, allowing attacker to cause a denial of service via a crafted TIFF image.

Vulnerable code:

libtiff-master/libtiff/rgb2ycbcr.c:193

187         lumaGreen[TIFFGetG(RGB)] +
188         lumaBlue[TIFFGetB(RGB)];
189     /* accumulate chrominance */
190     Cb += (TIFFGetB(RGB) - Y) * D1;
191     Cr += (TIFFGetR(RGB) - Y) * D2;
192     /* emit luminence */
193     *op++ = V2Code(Y,
194         refBlackWhite[0], refBlackWhite[1], 255);
195                 }

Public via:

http://seclists.org/oss-sec/2016/q2/28

Comment 1 Andrej Nemec 2016-04-08 08:10:20 UTC
Acknowledgments:

Name: Mei Wang (Qihoo 360)

Comment 3 Stefan Cornelius 2017-05-11 10:18:09 UTC
The command line parameters passed to the tool influence the calculations within the cvtRaster() function in gb2ycbcr.c. This can lead to a call to _TIFFmalloc() with a bogus size. If this allocation fails, NULL is returned. The application doesn't check for this condition, which ultimately leads to an access violation when the cvtClump() function tries to write "into" it.

I've not really investigated what happens if the allocation succeeds - worst case could be a memory corruption, but since this issue depends on far-fetched custom command line parameters, I consider the likelyhood and impact of this to be minimal.

Comment 4 Stefan Cornelius 2017-05-11 10:18:18 UTC
External References:

http://bugzilla.maptools.org/show_bug.cgi?id=2568

Comment 5 Stefan Cornelius 2017-05-11 10:18:24 UTC
Statement:

Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.


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