Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date: Wed, 15 Jun 2016 02:37:11 +0000
From: 张开翔 <zhangkaixiang@....cn>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: CVE-2016-5323: libtiff 4.0.6 tiffcrop _TIFFFax3fillruns(): divide
 by zero

Details
=======

Product: libtiff
Affected Versions: <= 4.0.6
Vulnerability Type: divide by zero
Vendor URL: http://www.remotesensing.org/libtiff/
Credit: Kaixiang Zhang of the Cloud Security Team, Qihoo 360
CVE ID: CVE-2016-5323
Tested system version:
       fedora23 32bit
       fedora23 64bit
       CentOS Linux release 7.1.1503 64bit

Introduction
=======

t was always corrupted when I use tiffcrop command followed by a crafted TIFF image in function _TIFFFax3fillruns () without checking the value of divisor, it causes a divide by zero flaw. Attackers cound exploit this issue to cause denial-of-service.

Here is the stack info:
gdb –args ./tiffcrop _TIFFFax3fillruns.tif tmpout.tif
--- ---
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7ad97f0 in _TIFFFax3fillruns (buf=0x0, runs=0x673500, erun=<optimized out>, lastx=64) at tif_fax3.c:407
407                              ZERO(n, cp);
(gdb) bt
#0  0x00007ffff7ad97f0 in _TIFFFax3fillruns (buf=0x0, runs=0x673500, erun=<optimized out>, lastx=64) at tif_fax3.c:407
#1  0x00007ffff7ae087c in Fax3DecodeRLE (tif=0x662010, buf=0x0, occ=8192, s=<optimized out>) at tif_fax3.c:1527
#2  0x00007ffff7ba3739 in TIFFReadEncodedTile (tif=tif@...ry=0x662010, tile=8, buf=0x0, size=8192, size@...ry=-1) at tif_read.c:668
#3  0x00007ffff7ba3a01 in TIFFReadTile (tif=tif@...ry=0x662010, buf=<optimized out>, x=x@...ry=0, y=y@...ry=0, z=z@...ry=0, s=s@...ry=8) at tif_read.c:641
#4  0x0000000000443e41 in readSeparateTilesIntoBuffer (bps=1, spp=129, tl=1024, tw=64, imagewidth=32, imagelength=32, obuf=0x7ffff7ee5010 "", in=0x662010) at tiffcrop.c:994
#5  loadImage (in=in@...ry=0x662010, image=image@...ry=0x7fffffff7960, dump=dump@...ry=0x7fffffffc270, read_ptr=read_ptr@...ry=0x7fffffff7920) at tiffcrop.c:6079
#6  0x0000000000403209 in main (argc=<optimized out>, argv=<optimized out>) at tiffcrop.c:2278
(gdb) p cp
$2 = (unsigned char *) 0x0


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.