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Date: Fri, 8 Apr 2016 07:13:29 +0000
From: 张开翔 <zhangkaixiang@....cn>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: CVE-2016-3633 - libtiff 4.0.6 illegel read

Details

=======



Product: libtiff

Affected Versions: <= 4.0.6

Vulnerability Type: Illegel read

Vendor URL: http://www.libtiff.org/

CVE ID: CVE-2016-3633

Credit: Kaixiang Zhang of the Cloud Security Team, Qihoo 360



Introduction

Illegal read occurs in the _ setrow function in thumbnail.c when using thumbnail command, which allows attackers to exploit this issue to cause denial-of-service.


/libtiff/tools/thumbnail.c:525
523  for (y = 0; y < nrows; y++) {
524      const uint8* src = rows[y] + off;
525      acc += bits[*src++ & mask0];

gdb  --args  thumbnail  setrow.tif  tmpout.tif
……
Program received signal SIGSEGV, Segmentation fault.
0x08049de5 in setrow (row=0x8061d00 "", nrows=256, rows=0xbfffeba0) at thumbnail.c:525
525                acc += bits[*src++ & mask0];
(gdb) bt
#0  0x08049de5 in setrow (row=0x8061d00 "", nrows=256, rows=0xbfffeba0) at thumbnail.c:525
#1  0x0804a07a in setImage1 (br=0x804d9b8 "\377", rw=5242880, rh=5242880) at thumbnail.c:581
#2  0x0804a121 in setImage (br=0x804d9b8 "\377", rw=5242880, rh=5242880) at thumbnail.c:591
#3  0x0804a2db in generateThumbnail (in=0x804d530, out=0x804d008) at thumbnail.c:633
#4  0x08048f5f in main (argc=3, argv=0xbffff134) at thumbnail.c:122
(gdb) p *src
Cannot access memory at address 0x8204988

References:
[1] http://www.remotesensing.org/libtiff/
[2] http://bugzilla.maptools.org/buglist.cgi?product=libtiff


Thank you!

Best Regards,

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