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Message-ID: <578D140E.1040206@mvista.com>
Date: Mon, 18 Jul 2016 10:38:22 -0700
From: akuster <akuster@...sta.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE-2016-5321: libtiff 4.0.6 DumpModeDecode():
Ddos
Hello,
If I am not mistaken, this maybe the fix for this CVE.
https://github.com/vadz/libtiff/commit/d9783e4a1476b6787a51c5ae9e9b3156527589f0
can someone confirm
regards,
Armin
On 06/14/2016 07:35 PM, 张开翔 wrote:
> Details
> =======
>
> Product: libtiff
> Affected Versions: <= 4.0.6
> Vulnerability Type: illegel read
> Vendor URL: http://www.remotesensing.org/libtiff/
> Credit: Kaixiang Zhang of the Cloud Security Team, Qihoo 360
> CVE ID: CVE-2016-5321
> Tested system version:
> fedora23 32bit
> fedora23 64bit
> CentOS Linux release 7.1.1503 64bit
>
>
> Introduction
> =======
>
> It was always corrupted when I use tiffcrop command followed by a crafted TIFF image.The vulnerbility exists in fuction DumpModeDecode() whitout checking the value of output parameters, Attackers could exploit this issue to cause denial-of-service.
>
>
> Here is the stack info:
> gdb –args ./tiffcrop DumpModeDecode.tif tmpout.tif
> --- ---
> __memcpy_ssse3_back () at ../sysdeps/x86_64/multiarch/memcpy-ssse3-back.S:2709
> 2709 movdqu %xmm0, 36(%rdi)
> Program received signal SIGSEGV, Segmentation fault.
> __memcpy_ssse3_back () at ../sysdeps/x86_64/multiarch/memcpy-ssse3-back.S:2709
> 2709 movdqu %xmm0, 36(%rdi)
> (gdb) bt
> #0 __memcpy_ssse3_back () at ../sysdeps/x86_64/multiarch/memcpy-ssse3-back.S:2709
> #1 0x00007ffff7ad6a79 in DumpModeDecode (tif=0x662010, buf=<optimized out>, cc=52, s=<optimized out>) at tif_dumpmode.c:103
> #2 0x00007ffff7ba3739 in TIFFReadEncodedTile (tif=tif@...ry=0x662010, tile=8, buf=0x0, size=52, 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=208, spp=9, tl=1, tw=2, imagewidth=2, imagelength=1, obuf=0x662ce0 "\200\177\335\367\377\177", 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 buf
> $6 = 0x0
>
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