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Date: Fri, 8 Apr 2016 07:14:55 +0000
From: 张开翔 <zhangkaixiang@....cn>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: CVE-2016-3634 - libtiff illegel read
Details
=======
Product: libtiff
Affected Versions: <= 4.0.6
Vulnerability Type: Illegel read
Vendor URL: http://www.remotesensing.org/libtiff/
CVE ID: CVE-2016-3634
Credit: Kaixiang Zhang of the Cloud Security Team, Qihoo 360
Introduction
Illegal read occurs in the tagCompare function in tif_dirinfo.c when using thumbnail command, which allows attackers to exploit this issue to cause denial-of-service.
/libtiff/tif_dirinfo.c: 341
tagCompare(const void* a, const void* b)
337{
338 const TIFFField* ta = *(const TIFFField**) a;
339 const TIFFField* tb = *(const TIFFField**) b;
340 /* NB: be careful of return values for 16-bit platforms */
341 if (ta->field_tag != tb->field_tag)
342 return (int)ta->field_tag - (int)tb->field_tag;
343 else
344 return (ta->field_type == TIFF_ANY) ?
345 0 : ((int)tb->field_type - (int)ta->field_type);
346}
gdb --args thumbnail tagCompare.tif tmpout.tif
…….
Program received signal SIGSEGV, Segmentation fault.
tagCompare (b=0x8164a84, a=<synthetic pointer>) at tif_dirinfo.c:341
341 if (ta->field_tag != tb->field_tag)
(gdb) bt
#0 tagCompare (b=0x8164a84, a=<synthetic pointer>) at tif_dirinfo.c:341
#1 bsearch (__compar=0x8067330 <tagCompare>, __size=4, __nmemb=153, __base=0x8164a60, __key=<synthetic pointer>) at /usr/include/i386-linux-gnu/bits/stdlib-bsearch.h:33
#2 TIFFFindField (tif=0x8164530, tag=262, dt=TIFF_NOTYPE) at tif_dirinfo.c:518
#3 0x08060e06 in TIFFVGetField (ap=0xbffff238 "\032\065\026\b\377\377\377\377_\314\376\267\350\372\", tag=262, tif=0x8164530) at tif_dir.c:1172
#4 TIFFGetField (tif=0x8164530, tag=262) at tif_dir.c:1158
#5 0x0804ae2f in generateThumbnail (out=<optimized out>, in=<optimized out>) at thumbnail.c:631
#6 main (argc=3, argv=0xbffff374) at thumbnail.c:122
(gdb) p tb
$5 = (const TIFFField *) 0xffffffff
References:
[1] http://www.remotesensing.org/libtiff/
Thank you!
Best Regards,
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