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Date: Fri, 8 Apr 2016 07:16:12 +0000
From: 张开翔 <zhangkaixiang@....cn>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: CVE-2016-3658 - libtiff 4.0.6 illegel read
Details
=======
Product: libtiff
Affected Versions: <= 4.0.6
Vulnerability Type: Illegel read
Vendor URL: http://www.remotesensing.org/libtiff/
CVE ID: CVE-2016-3658
Credit: Kaixiang Zhang of the Cloud Security Team, Qihoo 360
Introduction
Illegal read occurs in the TIFFWriteDirectoryTagLongLong8Array function in tif_dirwrite.c when using tiffset command, which allows attackers to exploit this issue to cause denial-of-service.
/libtiff/tif_dirwrite.c: 1625
1623 for (q=p, ma=value, mb=0; mb<count; ma++, mb++, q++)
1624 {
1625 if (*ma>0xFFFFFFFF)
1626 {
1627 TIFFErrorExt(tif->tif_clientdata,module,
1628 "Attempt to write value larger than 0xFFFFFFFF in Classic TIFF file.");
1629 _TIFFfree(p);
1630 return(0);
1631 }
1632 *q= (uint32)(*ma);
1633 }
gdb --args ./tiffset -s 300 296 poc.tif
……
Program received signal SIGSEGV, Segmentation fault.
TIFFWriteDirectoryTagLongLong8Array (tif=0x606010, ndir=0x7fffffffe1f0, dir=0x606560, tag=<optimized out>, count=1, value=0x0) at tif_dirwrite.c:1625
1625 if (*ma>0xFFFFFFFF)
(gdb) bt
#0 TIFFWriteDirectoryTagLongLong8Array (tif=0x606010, ndir=0x7fffffffe1f0, dir=0x606560, tag=<optimized out>, count=1, value=0x0) at tif_dirwrite.c:1625
#1 0x00007ffff7abd867 in TIFFWriteDirectorySec (tif=0x606010, isimage=1, imagedone=1, pdiroff=0x0) at tif_dirwrite.c:550
#2 0x00007ffff7ad302c in TIFFRewriteDirectory (tif=tif@...ry=0x606010) at tif_dirwrite.c:359
#3 0x0000000000401a70 in main (argc=5, argv=<optimized out>) at tiffset.c:344
(gdb) l
1620 return(0);
1621 }
1622
1623 for (q=p, ma=value, mb=0; mb<count; ma++, mb++, q++)
1624 {
1625 if (*ma>0xFFFFFFFF)
1626 {
1627 TIFFErrorExt(tif->tif_clientdata,module,
1628 "Attempt to write value larger than 0xFFFFFFFF in Classic TIFF file.");
1629 _TIFFfree(p);
(gdb) p ma
$1 = (uint64 *) 0x0
References:
[1] http://www.remotesensing.org/libtiff/
Thank you!
Best Regards,
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