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Fix CVE-2016-9297:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9297
http://bugzilla.maptools.org/show_bug.cgi?id=2590
Patch copied from upstream source repository.
2016-11-11 Even Rouault <even.rouault at spatialys.com>
* 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
/cvs/maptools/cvsroot/libtiff/ChangeLog,v <-- ChangeLog
new revision: 1.1154; previous revision: 1.1153
/cvs/maptools/cvsroot/libtiff/libtiff/tif_dirread.c,v <--
libtiff/tif_dirread.c
new revision: 1.203; previous revision: 1.202Index: libtiff/libtiff/tif_dirread.c
===================================================================
RCS file: /cvs/maptools/cvsroot/libtiff/libtiff/tif_dirread.c,v
retrieving revision 1.202
retrieving revision 1.203
diff -u -r1.202 -r1.203
--- libtiff/libtiff/tif_dirread.c 11 Nov 2016 20:01:55 -0000 1.202
+++ libtiff/libtiff/tif_dirread.c 11 Nov 2016 20:22:01 -0000 1.203
@@ -5000,6 +5000,11 @@
if (err==TIFFReadDirEntryErrOk)
{
int m;
+ if( data[dp->tdir_count-1] != '\0' )
+ {
+ TIFFWarningExt(tif->tif_clientdata,module,"ASCII value for tag \"%s\" does not end in null byte. Forcing it to be null",fip->field_name);
+ data[dp->tdir_count-1] = '\0';
+ }
m=TIFFSetField(tif,dp->tdir_tag,(uint16)(dp->tdir_count),data);
if (data!=0)
_TIFFfree(data);
@@ -5172,6 +5177,11 @@
if (err==TIFFReadDirEntryErrOk)
{
int m;
+ if( data[dp->tdir_count-1] != '\0' )
+ {
+ TIFFWarningExt(tif->tif_clientdata,module,"ASCII value for tag \"%s\" does not end in null byte. Forcing it to be null",fip->field_name);
+ data[dp->tdir_count-1] = '\0';
+ }
m=TIFFSetField(tif,dp->tdir_tag,(uint32)(dp->tdir_count),data);
if (data!=0)
_TIFFfree(data);
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