[<prev] [next>] [day] [month] [year] [list]
Message-ID: <04F55884-564E-4A3E-8D22-AF3E17DA229E@360.cn>
Date: Thu, 7 Apr 2016 07:43:32 +0000
From: 王梅 <wangmei@....cn>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: CVE-2016-3622 libtiff: Divide By Zero in the tiff2rgba tool
Details
=======
Product: libtiff
Affected Versions: <= 4.0.6
Vulnerability Type: Divide By Zero
Vendor URL: http://www.libtiff.org/
CVE ID: CVE-2016-3622
Credit: Mei Wang of the Cloud Security Team, Qihoo 360
Introduction
============
Division by zero occurs in the fpAcc function in tif_predict.c in tiff2rgba allows attackers to cause a denial of service via a crafted TIFF image.
libtiff-master/libtiff/tif_predict.c:381.
377 fpAcc(TIFF* tif, uint8* cp0, tmsize_t cc)
378 {
379 tmsize_t stride = PredictorState(tif)->stride;
380 uint32 bps = tif->tif_dir.td_bitspersample / 8;
381 tmsize_t wc = cc / bps;
382 tmsize_t count = cc;
383 uint8 *cp = (uint8 *) cp0;
384 uint8 *tmp = (uint8 *)_TIFFmalloc(cc);
gdb tiff2rgba
(gdb) r sample/tiff2rgba_1.tif 1.tif
Starting program: /usr/local/bin/tiff2rgba sample/tiff2rgba_1.tif 1.tif
TIFFReadDirectoryCheckOrder: Warning, Invalid TIFF directory; tags are not sorted in ascending order.
sample/tiff2rgba_1.tif: Warning, Nonstandard tile length 1, convert file.
TIFFFetchNormalTag: Warning, IO error during reading of "DocumentName"; tag ignored.
TIFFFetchNormalTag: Warning, Incorrect count for "Orientation"; tag ignored.
Program received signal SIGFPE, Arithmetic exception.
0x00007ffff7baffe0 in fpAcc (tif=0x604930, cp0=0x6056b0 "", cc=4) at tif_predict.c:381
381 tmsize_t wc = cc / bps;
(gdb) p bps
$1 = 0
(gdb) bt
#0 0x00007ffff7baffe0 in fpAcc (tif=0x604930, cp0=0x6056b0 "", cc=4) at tif_predict.c:381
#1 0x00007ffff7bb0457 in PredictorDecodeTile (tif=0x604930, op0=0x6056b0 "", occ0=4, s=0) at tif_predict.c:453
#2 0x00007ffff7bb4f9f in TIFFReadEncodedTile (tif=0x604930, tile=0, buf=0x6056b0, size=4) at tif_read.c:668
#3 0x00007ffff7bb4e87 in TIFFReadTile (tif=0x604930, buf=0x6056b0, x=0, y=0, z=0, s=0) at tif_read.c:641
#4 0x00007ffff7b972f1 in gtTileContig (img=0x7fffffffdd90, raster=0x605940, w=32, h=32) at tif_getimage.c:661
#5 0x00007ffff7b96ce7 in TIFFRGBAImageGet (img=0x7fffffffdd90, raster=0x605940, w=32, h=32) at tif_getimage.c:500
#6 0x00007ffff7b96ddd in TIFFReadRGBAImageOriented (tif=0x604930, rwidth=32, rheight=32, raster=0x605940, orientation=1, stop=0)
at tif_getimage.c:519
#7 0x000000000040196c in cvt_whole_image (in=0x604930, out=0x604010) at tiff2rgba.c:386
#8 0x0000000000401e6d in tiffcvt (in=0x604930, out=0x604010) at tiff2rgba.c:504
#9 0x00000000004011b5 in main (argc=3, argv=0x7fffffffe418) at tiff2rgba.c:126
References:
[1] http://www.remotesensing.org/libtiff/
[2] http://bugzilla.maptools.org/buglist.cgi?product=libtiff
Thank you!
Best Regards,
Mei
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
