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Date: Fri, 8 Apr 2016 05:02:06 +0000
From: 王梅 <wangmei@....cn>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: CVE-2016-3625 libtiff: Out-of-bounds Read in the tiff2bw tool
Details
=======
Product: libtiff
Affected Versions: <= 4.0.6
Vulnerability Type: Out-of-bounds Read
Vendor URL: http://www.remotesensing.org/libtiff/
CVE ID: CVE-2016-3625
Credit: Mei Wang of the Cloud Security Team, Qihoo 360
Introduction
============
Out-of-bounds Read occurred in tif_read.c:545 or tif_read.c:402 or tif_read.c:560 in tiff2bw allows attackers to cause a denial of service via a crafted TIFF image.
gdb tiff2bw
(gdb)r sample/tiff2bw_1.tif 1.tif
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7bb4b3a in TIFFFillStrip (tif=0x604010, strip=0) at tif_read.c:545
545 td->td_stripoffset[strip] > (uint64)tif->tif_size - bytecount) {
Missing separate debuginfos, use: debuginfo-install glibc-2.17-78.el7.x86_64
(gdb) p td->td_stripoffset[strip]
Cannot access memory at address 0x0
(gdb) bt
#0 0x00007ffff7bb4b3a in TIFFFillStrip (tif=0x604010, strip=0) at tif_read.c:545
#1 0x00007ffff7bb411a in TIFFSeek (tif=0x604010, row=0, sample=0) at tif_read.c:228
#2 0x00007ffff7bb42f2 in TIFFReadScanline (tif=0x604010, buf=0x6076d0, row=0, sample=0) at tif_read.c:295
#3 0x000000000040197e in main (argc=3, argv=0x7fffffffe428) at tiff2bw.c:253
(gdb)
(gdb) r sample/tiff2bw_2.tif 1.tif
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7bb46e4 in TIFFReadRawStrip1 (tif=0x604010, strip=0, buf=0x605620, size=10, module=0x7ffff7bcfa81 <module.3917> "TIFFFillStrip") at tif_read.c:402
402 ma=(tmsize_t)td->td_stripoffset[strip];
(gdb) p td->td_stripoffset[strip]
Cannot access memory at address 0x0
(gdb) bt
#0 0x00007ffff7bb46e4 in TIFFReadRawStrip1 (tif=0x604010, strip=0, buf=0x605620, size=10, module=0x7ffff7bcfa81 <module.3917> "TIFFFillStrip") at tif_read.c:402
#1 0x00007ffff7bb4d73 in TIFFFillStrip (tif=0x604010, strip=0) at tif_read.c:612
#2 0x00007ffff7bb411a in TIFFSeek (tif=0x604010, row=0, sample=0) at tif_read.c:228
#3 0x00007ffff7bb42f2 in TIFFReadScanline (tif=0x604010, buf=0x6076e0, row=0, sample=0) at tif_read.c:295
#4 0x000000000040197e in main (argc=3, argv=0x7fffffffe428) at tiff2bw.c:253
(gdb) r sample/tiff2bw_3.tif 1.tif
Program received signal SIGSEGV, Segmentation fault.
TIFFFillStrip (tif=0x604010, strip=0) at tif_read.c:560
560 TIFFErrorExt(tif->tif_clientdata, module,
(gdb) l
555 "got %I64u bytes, expected %I64u",
556 (unsigned long) strip,
557 (unsigned __int64) tif->tif_size - td->td_stripoffset[strip],
558 (unsigned __int64) bytecount);
559 #else
560 TIFFErrorExt(tif->tif_clientdata, module,
561
562 "Read error on strip %lu; "
563 "got %llu bytes, expected %llu",
564 (unsigned long) strip,
(gdb) p td->td_stripoffset[strip]
Cannot access memory at address 0x0
(gdb) bt
#0 TIFFFillStrip (tif=0x604010, strip=0) at tif_read.c:560
#1 0x00007ffff7bb411a in TIFFSeek (tif=0x604010, row=0, sample=0) at tif_read.c:228
#2 0x00007ffff7bb42f2 in TIFFReadScanline (tif=0x604010, buf=0x607600, row=0, sample=0) at tif_read.c:295
#3 0x000000000040197e in main (argc=3, argv=0x7fffffffe428) at tiff2bw.c:253
References:
[1] http://www.remotesensing.org/libtiff/
[2] http://bugzilla.maptools.org/buglist.cgi?product=libtiff
Thank you!
Best Regards,
Mei
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