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* libtiff/tif_dir.c: discard values of SMinSampleValue and

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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)

* libtiff/tif_write.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)
This commit is contained in:
Even Rouault 2016-10-25 21:35:15 +00:00
parent 0c05834d05
commit 739dcd28a0
3 changed files with 57 additions and 4 deletions
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19
ChangeLog
View File

@ -1,3 +1,22 @@
2016-10-25 Even Rouault <even.rouault at spatialys.com>
* 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)
* libtiff/tif_write.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)
2016-10-25 Even Rouault <even.rouault at spatialys.com> 2016-10-25 Even Rouault <even.rouault at spatialys.com>
* tools/tiffinfo.c: fix out-of-bound read on some tiled images. * tools/tiffinfo.c: fix out-of-bound read on some tiled images.

24
libtiff/tif_dir.c
View File

@ -1,4 +1,4 @@
/* $Id: tif_dir.c,v 1.126 2016-09-04 21:32:56 erouault Exp $ */ /* $Id: tif_dir.c,v 1.127 2016-10-25 21:35:15 erouault Exp $ */
/* /*
* Copyright (c) 1988-1997 Sam Leffler * Copyright (c) 1988-1997 Sam Leffler
@ -256,6 +256,28 @@ _TIFFVSetField(TIFF* tif, uint32 tag, va_list ap)
v = (uint16) va_arg(ap, uint16_vap); v = (uint16) va_arg(ap, uint16_vap);
if (v == 0) if (v == 0)
goto badvalue; goto badvalue;
if( v != td->td_samplesperpixel )
{
/* See http://bugzilla.maptools.org/show_bug.cgi?id=2500 */
if( td->td_sminsamplevalue != NULL )
{
TIFFWarningExt(tif->tif_clientdata,module,
"SamplesPerPixel tag value is changing, "
"but SMinSampleValue tag was read with a different value. Cancelling it");
TIFFClrFieldBit(tif,FIELD_SMINSAMPLEVALUE);
_TIFFfree(td->td_sminsamplevalue);
td->td_sminsamplevalue = NULL;
}
if( td->td_smaxsamplevalue != NULL )
{
TIFFWarningExt(tif->tif_clientdata,module,
"SamplesPerPixel tag value is changing, "
"but SMaxSampleValue tag was read with a different value. Cancelling it");
TIFFClrFieldBit(tif,FIELD_SMAXSAMPLEVALUE);
_TIFFfree(td->td_smaxsamplevalue);
td->td_smaxsamplevalue = NULL;
}
}
td->td_samplesperpixel = (uint16) v; td->td_samplesperpixel = (uint16) v;
break; break;
case TIFFTAG_ROWSPERSTRIP: case TIFFTAG_ROWSPERSTRIP:

18
libtiff/tif_dirwrite.c
View File

@ -1,4 +1,4 @@
/* $Id: tif_dirwrite.c,v 1.82 2016-09-02 22:42:00 erouault Exp $ */ /* $Id: tif_dirwrite.c,v 1.83 2016-10-25 21:35:15 erouault Exp $ */
/* /*
* Copyright (c) 1988-1997 Sam Leffler * Copyright (c) 1988-1997 Sam Leffler
@ -542,8 +542,20 @@ TIFFWriteDirectorySec(TIFF* tif, int isimage, int imagedone, uint64* pdiroff)
{ {
if (!isTiled(tif)) if (!isTiled(tif))
{ {
if (!TIFFWriteDirectoryTagLongLong8Array(tif,&ndir,dir,TIFFTAG_STRIPOFFSETS,tif->tif_dir.td_nstrips,tif->tif_dir.td_stripoffset)) /* td_stripoffset might be NULL in an odd OJPEG case. See
goto bad; * tif_dirread.c around line 3634.
* XXX: OJPEG hack.
* If a) compression is OJPEG, b) it's not a tiled TIFF,
* and c) the number of strips is 1,
* then we tolerate the absence of stripoffsets tag,
* because, presumably, all required data is in the
* JpegInterchangeFormat stream.
* We can get here when using tiffset on such a file.
* See http://bugzilla.maptools.org/show_bug.cgi?id=2500
*/
if (tif->tif_dir.td_stripoffset != NULL &&
!TIFFWriteDirectoryTagLongLong8Array(tif,&ndir,dir,TIFFTAG_STRIPOFFSETS,tif->tif_dir.td_nstrips,tif->tif_dir.td_stripoffset))
goto bad;
} }
else else
{ {