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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<HTML>
<HEAD>
<TITLE>
Changes in TIFF v4.0.7
</TITLE>
</HEAD>
<BODY BGCOLOR=white>
<FONT FACE="Helvetica, Arial, Sans">
<BASEFONT SIZE=4>
<B><FONT SIZE=+3>T</FONT>IFF <FONT SIZE=+2>C</FONT>HANGE <FONT SIZE=+2>I</FONT>NFORMATION</B>
<BASEFONT SIZE=3>
<UL>
<HR SIZE=4 WIDTH=65% ALIGN=left>
<B>Current Version</B>: v4.0.7<BR>
<B>Previous Version</B>: <A HREF=v4.0.6.html>v4.0.6</a><BR>
<B>Master Download Site</B>: <A HREF="https://download.osgeo.org/libtiff">
download.osgeo.org</a>, directory pub/libtiff</A><BR>
<B>Master HTTP Site #1</B>: <A HREF="http://www.simplesystems.org/libtiff/">
http://www.simplesystems.org/libtiff/</a><BR>
<B>Master HTTP Site #2</B>: <A HREF="http://libtiff.maptools.org/">
http://libtiff.maptools.org/</a>
<HR SIZE=4 WIDTH=65% ALIGN=left>
</UL>
<P>
This document describes the changes made to the software between the
<I>previous</I> and <I>current</I> versions (see above). If you don't
find something listed here, then it was not done in this timeframe, or
it was not considered important enough to be mentioned. The following
information is located here:
<UL>
<LI><A HREF="#highlights">Major Changes</A>
<LI><A HREF="#configure">Changes in the software configuration</A>
<LI><A HREF="#libtiff">Changes in libtiff</A>
<LI><A HREF="#tools">Changes in the tools</A>
<LI><A HREF="#contrib">Changes in the contrib area</A>
</UL>
<p>
<P><HR WIDTH=65% ALIGN=left>
<!--------------------------------------------------------------------------->
<A NAME="highlights"><B><FONT SIZE=+3>M</FONT>AJOR CHANGES:</B></A>
<UL>
<LI> The libtiff tools bmp2tiff, gif2tiff, ras2tiff, sgi2tiff,
sgisv, and ycbcr are completely removed from the distribution.
These tools were written in the late 1980s and early 1990s for
test and demonstration purposes. In some cases the tools were
never updated to support updates to the file format, or the
file formats are now rarely used. In all cases these tools
increased the libtiff security and maintenance exposure beyond
the value offered by the tool.
</UL>
<P><HR WIDTH=65% ALIGN=left>
<!--------------------------------------------------------------------------->
<A NAME="configure"><B><FONT SIZE=+3>C</FONT>HANGES IN THE SOFTWARE CONFIGURATION:</B></A>
<UL>
<LI> None
</UL>
<P><HR WIDTH=65% ALIGN=left>
<!--------------------------------------------------------------------------->
<A NAME="libtiff"><B><FONT SIZE=+3>C</FONT>HANGES IN LIBTIFF:</B></A>
<UL>
<LI> libtiff/tif_dirread.c: in TIFFFetchNormalTag(), do not
dereference NULL pointer when values of tags with
TIFF_SETGET_C16_ASCII / TIFF_SETGET_C32_ASCII access are
0-byte arrays. Fixes
http://bugzilla.maptools.org/show_bug.cgi?id=2593 (regression
introduced by previous fix done on 2016-11-11 for
CVE-2016-9297). Reported by Henri Salo. Assigned as
CVE-2016-9448
<LI> libtiff/tif_aux.c: fix crash in TIFFVGetFieldDefaulted() when
requesting Predictor tag and that the zip/lzw codec is not
configured. Fixes
http://bugzilla.maptools.org/show_bug.cgi?id=2591
<LI> libtiff/tif_dirread.c: in TIFFFetchNormalTag(), make sure
that values of tags with TIFF_SETGET_C16_ASCII /
TIFF_SETGET_C32_ASCII access are null terminated, to avoid
potential read outside buffer in _TIFFPrintField(). Fixes
http://bugzilla.maptools.org/show_bug.cgi?id=2590
<LI> libtiff/tif_dirread.c: reject images with OJPEG compression
that have no TileOffsets/StripOffsets tag, when OJPEG
compression is disabled. Prevent null pointer dereference in
TIFFReadRawStrip1() and other functions that expect
td_stripbytecount to be non NULL. Fixes
http://bugzilla.maptools.org/show_bug.cgi?id=2585
<LI> libtiff/tif_strip.c: make TIFFNumberOfStrips() return the
td->td_nstrips value when it is non-zero, instead of
recomputing it. This is needed in TIFF_STRIPCHOP mode where
td_nstrips is modified. Fixes a read outsize of array in
tiffsplit (or other utilities using TIFFNumberOfStrips()).
Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2587
(CVE-2016-9273)
<LI> libtiff/tif_predict.h, libtiff/tif_predict.c: Replace
assertions by runtime checks to avoid assertions in debug
mode, or buffer overflows in release mode. Can happen when
dealing with unusual tile size like YCbCr with
subsampling. Reported as MSVR 35105 by Axel Souchet & Vishal
Chauhan from the MSRC Vulnerabilities & Mitigations
<LI> libtiff/tif_dir.c: discard values of SMinSampleValue and
SMaxSampleValue when they have been read and the value of
SamplesPerPixel is changed afterwards (like when reading a
OJPEG compressed image with a missing SamplesPerPixel tag, and
whose photometric is RGB or YCbCr, forcing SamplesPerPixel
being 3). Otherwise when rewriting the directory (for example
with tiffset, we will expect 3 values whereas the array had
been allocated with just one), thus causing a out of bound
read access. Fixes
http://bugzilla.maptools.org/show_bug.cgi?id=2500
(CVE-2014-8127, duplicate: CVE-2016-3658)
<LI> libtiff/tif_dirwrite.c: avoid null pointer dereference on
td_stripoffset when writing directory, if FIELD_STRIPOFFSETS
was artificially set for a hack case in OJPEG case. Fixes
http://bugzilla.maptools.org/show_bug.cgi?id=2500
(CVE-2014-8127, duplicate: CVE-2016-3658)
<LI> libtiff/tif_getimage.c (TIFFRGBAImageOK): Reject attempts to
read floating point images.
<LI> libtiff/tif_predict.c (PredictorSetup): Enforce
bits-per-sample requirements of floating point predictor (3).
Fixes CVE-2016-3622 "Divide By Zero in the tiff2rgba tool."
<LI> libtiff/tif_pixarlog.c: fix out-of-bounds write vulnerabilities
in heap allocated buffers. Reported as MSVR 35094. Discovered by
Axel Souchet and Vishal Chauhan from the MSRC Vulnerabilities &
Mitigations team.
<LI> libtiff/tif_write.c: fix issue in error code path of
TIFFFlushData1() that didn't reset the tif_rawcc and tif_rawcp
members. I'm not completely sure if that could happen in
practice outside of the odd behaviour of t2p_seekproc() of
tiff2pdf). The report points that a better fix could be to
check the return value of TIFFFlushData1() in places where it
isn't done currently, but it seems this patch is enough.
Reported as MSVR 35095. Discovered by Axel Souchet & Vishal
Chauhan & Suha Can from the MSRC Vulnerabilities & Mitigations
team.
<LI> libtiff/tif_pixarlog.c: Fix write buffer overflow in
PixarLogEncode if more input samples are provided than
expected by PixarLogSetupEncode. Idea based on
libtiff-CVE-2016-3990.patch from
libtiff-4.0.3-25.el7_2.src.rpm by Nikola Forro, but with
different and simpler check. (bugzilla #2544)
<LI> libtiff/tif_read.c: Fix out-of-bounds read on memory-mapped
files in TIFFReadRawStrip1() and TIFFReadRawTile1() when
stripoffset is beyond tmsize_t max value (reported by Mathias
Svensson)
<LI> libtiff/tif_read.c: make TIFFReadEncodedStrip() and
TIFFReadEncodedTile() directly use user provided buffer when
no compression (and other conditions) to save a memcpy()
<LI> libtiff/tif_write.c: make TIFFWriteEncodedStrip() and
TIFFWriteEncodedTile() directly use user provided buffer when
no compression to save a memcpy().
<LI> libtiff/tif_luv.c: validate that for COMPRESSION_SGILOG and
PHOTOMETRIC_LOGL, there is only one sample per pixel. Avoid
potential invalid memory write on corrupted/unexpected images
when using the TIFFRGBAImageBegin() interface (reported by
Clay Wood)
<LI> libtiff/tif_pixarlog.c: fix potential buffer write overrun in
PixarLogDecode() on corrupted/unexpected images (reported by
Mathias Svensson) (CVE-2016-5875)
<LI> libtiff/libtiff.def: Added _TIFFMultiply32 and
_TIFFMultiply64 to libtiff.def
<LI> libtiff/tif_config.vc.h (HAVE_SNPRINTF): Add a '1' to the
HAVE_SNPRINTF definition.
<LI> libtiff/tif_config.vc.h (HAVE_SNPRINTF): Applied patch by
Edward Lam to define HAVE_SNPRINTF for Visual Studio 2015.
<LI> libtiff/tif_dirread.c: when compiled with DEFER_STRILE_LOAD,
fix regression, introduced on 2014-12-23, when reading a
one-strip file without a StripByteCounts tag. GDAL #6490
<LI> libtiff/*: upstream typo fixes (mostly contributed by Kurt
Schwehr) coming from GDAL internal libtiff
<LI> libtiff/tif_fax3.h: make Param member of TIFFFaxTabEnt
structure a uint16 to reduce size of the binary.
<LI> libtiff/tif_read.c, tif_dirread.c: fix indentation issues
raised by GCC 6 -Wmisleading-indentation
<LI> libtiff/tif_pixarlog.c: avoid zlib error messages to pass a
NULL string to %s formatter, which is undefined behaviour in
sprintf().
<LI> libtiff/tif_next.c: fix potential out-of-bound write in NeXTDecode()
triggered by http://lcamtuf.coredump.cx/afl/vulns/libtiff5.tif
(bugzilla #2508)
<LI> libtiff/tif_luv.c: fix potential out-of-bound writes in
decode functions in non debug builds by replacing assert()s by
regular if checks (bugzilla #2522). Fix potential
out-of-bound reads in case of short input data.
<LI> libtiff/tif_getimage.c: fix out-of-bound reads in
TIFFRGBAImage interface in case of unsupported values of
SamplesPerPixel/ExtraSamples for LogLUV / CIELab. Add explicit
call to TIFFRGBAImageOK() in TIFFRGBAImageBegin(). Fix
CVE-2015-8665 reported by limingxing and CVE-2015-8683
reported by zzf of Alibaba.
<LI> libtiff/tif_dirread.c: workaround false positive warning of
Clang Static Analyzer about null pointer dereference in
TIFFCheckDirOffset().
<LI> libtiff/tif_fax3.c: remove dead assignment in
Fax3PutEOLgdal(). Found by Clang Static Analyzer
<LI> libtiff/tif_dirwrite.c: fix truncation to 32 bit of file
offsets in TIFFLinkDirectory() and TIFFWriteDirectorySec()
when aligning directory offsets on a even offset (affects
BigTIFF). This was a regression of the changeset of
2015-10-19.
<LI> libtiff/tif_write.c: TIFFWriteEncodedStrip() and
TIFFWriteEncodedTile() should return -1 in case of failure of
tif_encodestrip() as documented
<LI> libtiff/tif_dumpmode.c: DumpModeEncode() should return 0 in
case of failure so that the above mentioned functions detect
the error.
<LI> libtiff/*.c: fix MSVC warnings related to cast shortening and
assignment within conditional expression
<LI> libtiff/*.c: fix clang -Wshorten-64-to-32 warnings
<LI> libtiff/tif_dirread.c: prevent reading ColorMap or
TransferFunction if BitsPerPixel > 24, so as to avoid huge
memory allocation and file read attempts
<LI> libtiff/tif_dirread.c: remove duplicated assignment (reported
by Clang static analyzer)
<LI> libtiff/tif_dir.c, libtiff/tif_dirinfo.c,
libtiff/tif_compress.c, libtiff/tif_jpeg_12.c: suppress
warnings about 'no previous declaration/prototype'
<LI> libtiff/tiffiop.h, libtiff/tif_dirwrite.c: suffix constants
by U to fix 'warning: negative integer implicitly converted to
unsigned type' warning (part of -Wconversion)
<LI> libtiff/tif_dir.c, libtiff/tif_dirread.c,
libtiff/tif_getimage.c, libtiff/tif_print.c: fix -Wshadow
warnings (only in libtiff/)
</UL>
<P><HR WIDTH=65% ALIGN=left>
<!-------------------------------------------------------------------------->
<A NAME="tools"><B><FONT SIZE=+3>C</FONT>HANGES IN THE TOOLS:</B></A>
<UL>
<LI> tools/Makefile.am: The libtiff tools bmp2tiff, gif2tiff,
ras2tiff, sgi2tiff, sgisv, and ycbcr are completely removed
from the distribution. The libtiff tools rgb2ycbcr and
thumbnail are only built in the build tree for testing. Old
files are put in new 'archive' subdirectory of the source
repository, but not in distribution archives. These changes
are made in order to lessen the maintenance burden.
<LI> tools/tiff2pdf.c: avoid undefined behaviour related to
overlapping of source and destination buffer in memcpy() call
in t2p_sample_rgbaa_to_rgb() Fixes
http://bugzilla.maptools.org/show_bug.cgi?id=2577
<LI> tools/tiff2pdf.c: fix potential integer overflows on 32 bit
builds in t2p_read_tiff_size() Fixes
http://bugzilla.maptools.org/show_bug.cgi?id=2576
<LI> tools/fax2tiff.c: fix segfault when specifying -r without
argument. Patch by Yuriy M. Kaminskiy. Fixes
http://bugzilla.maptools.org/show_bug.cgi?id=2572
<LI> tools/tiffinfo.c: fix out-of-bound read on some tiled images.
(http://bugzilla.maptools.org/show_bug.cgi?id=2517)
<LI> tools/tiffcrop.c: fix multiple uint32 overflows in
writeBufferToSeparateStrips(), writeBufferToContigTiles() and
writeBufferToSeparateTiles() that could cause heap buffer
overflows. Reported by Henri Salo from Nixu Corporation.
Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2592
<LI> tools/tiffcrop.c: fix out-of-bound read of up to 3 bytes in
readContigTilesIntoBuffer(). Reported as MSVR 35092 by Axel
Souchet & Vishal Chauhan from the MSRC Vulnerabilities &
Mitigations team.
<LI> tools/tiff2pdf.c: fix write buffer overflow of 2 bytes on
JPEG compressed images. Reported by Tyler Bohan of Cisco Talos
as TALOS-CAN-0187 / CVE-2016-5652. Also prevents writing 2
extra uninitialized bytes to the file stream.
<LI> tools/tiffcp.c: fix out-of-bounds write on tiled images with odd
tile width vs image width. Reported as MSVR 35103
by Axel Souchet and Vishal Chauhan from the MSRC Vulnerabilities &
Mitigations team.
<LI> tools/tiff2pdf.c: fix read -largely- outsize of buffer in
t2p_readwrite_pdf_image_tile(), causing crash, when reading a
JPEG compressed image with TIFFTAG_JPEGTABLES length being
one. Reported as MSVR 35101 by Axel Souchet and Vishal
Chauhan from the MSRC Vulnerabilities & Mitigations team.
<LI> tools/tiffcp.c: fix read of undefined variable in case of
missing required tags. Found on test case of MSVR 35100.
<LI> tools/tiffcrop.c: fix read of undefined buffer in
readContigStripsIntoBuffer() due to uint16 overflow. Probably
not a security issue but I can be wrong. Reported as MSVR
35100 by Axel Souchet from the MSRC Vulnerabilities &
Mitigations team.
<LI> tools/tiffcrop.c: fix various out-of-bounds write
vulnerabilities in heap or stack allocated buffers. Reported
as MSVR 35093, MSVR 35096 and MSVR 35097. Discovered by Axel
Souchet and Vishal Chauhan from the MSRC Vulnerabilities &
Mitigations team.
<LI> tools/tiff2pdf.c: fix out-of-bounds write vulnerabilities in
heap allocate buffer in t2p_process_jpeg_strip(). Reported as
MSVR 35098. Discovered by Axel Souchet and Vishal Chauhan from
the MSRC Vulnerabilities & Mitigations team.
<LI> tools/tiff2bw.c: fix weight computation that could result of
color value overflow (no security implication). Fix bugzilla
#2550. Patch by Frank Freudenberg.
<LI> tools/rgb2ycbcr.c: validate values of -v and -h parameters to
avoid potential divide by zero. Fixes CVE-2016-3623 (bugzilla #2569)
<LI> tools/tiffcrop.c: Fix out-of-bounds write in loadImage().
From patch libtiff-CVE-2016-3991.patch from
libtiff-4.0.3-25.el7_2.src.rpm by Nikola Forro (bugzilla
#2543)
<LI> tools/tiff2rgba.c: Fix integer overflow in size of allocated
buffer, when -b mode is enabled, that could result in
out-of-bounds write. Based initially on patch
tiff-CVE-2016-3945.patch from libtiff-4.0.3-25.el7_2.src.rpm
by Nikola Forro, with correction for invalid tests that
rejected valid files. (bugzilla #2545)
<LI> tools/tiffcrop.c: Avoid access outside of stack allocated
array on a tiled separate TIFF with more than 8 samples per
pixel. Reported by Kaixiang Zhang of the Cloud Security Team,
Qihoo 360 (CVE-2016-5321 / CVE-2016-5323 , bugzilla #2558 /
#2559)
<LI> tools/tiffdump.c: fix a few misaligned 64-bit reads warned by
-fsanitize
<LI> tools/tiffdump.c (ReadDirectory): Remove uint32 cast to
_TIFFmalloc() argument which resulted in Coverity report.
Added more mutiplication overflow checks.
</UL>
<P><HR WIDTH=65% ALIGN=left>
<!--------------------------------------------------------------------------->
<A NAME="contrib"><B><FONT SIZE=+3>C</FONT>HANGES IN THE CONTRIB AREA:</B></A>
<UL>
<LI> None
</UL>
Last updated $Date: 2016-11-19 17:47:40 $.
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