CVE-2016-10269 (published 2017-03-24T19:59Z)

LibTIFF 4.0.0alpha4, 4.0.0alpha5, 4.0.0alpha6, 4.0.0beta7, 4.0.0, 4.0.1, 4.0.2, 4.0.3, 4.0.4, 4.0.4beta, 4.0.5, 4.0.6 and 4.0.7 allows remote attackers to cause a denial of service (heap-based buffer over-read) or possibly have unspecified other impact via a crafted TIFF image, related to "READ of size 512" and libtiff/tif_unix.c:340:2.

Severity: MEDIUM
CVSS v2 base score: 6.8 (AV:N/AC:M/Au:N/C:P/I:P/A:P)
CVSS v3 base score: 7.8, HIGH (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)

Weakness information:
cwe_id: CWE-125
cwe_name: Out-of-bounds Read
description: The product reads data past the end, or before the beginning, of the intended buffer.
extended_description: 
            
            
             
			 
         
         

Fix information:
repo_url: https://github.com/vadz/libtiff
commit_details: repo_url: https://github.com/vadz/libtiff
author: erouault
author_date: 2016-12-02 23:05:51+00:00
msg: * libtiff/tif_pixarlog.c, libtiff/tif_luv.c: fix heap-based buffer
overflow on generation of PixarLog / LUV compressed files, with
ColorMap, TransferFunction attached and nasty plays with bitspersample.
The fix for LUV has not been tested, but suffers from the same kind
of issue of PixarLog.
Reported by Agostino Sarubbo.
Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2604
repository: repo_url: https://github.com/vadz/libtiff
repo_name: vadz/libtiff
description: OBSOLETE and not updated any more libtiff mirror, see website for the new one
repo_language: C
owner: vadz
file_changes: filename: ChangeLog
change_type: ModificationType.MODIFY
diff: @@ -1,3 +1,13 @@
+2016-12-03 Even Rouault <even.rouault at spatialys.com>
+
+	* libtiff/tif_pixarlog.c, libtiff/tif_luv.c: fix heap-based buffer
+	overflow on generation of PixarLog / LUV compressed files, with
+	ColorMap, TransferFunction attached and nasty plays with bitspersample.
+	The fix for LUV has not been tested, but suffers from the same kind
+	of issue of PixarLog.
+	Reported by Agostino Sarubbo.
+	Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2604
+
 2016-12-02 Even Rouault <even.rouault at spatialys.com>
 
 	* tools/tiffcp.c: avoid uint32 underflow in cpDecodedStrips that 

programming_language: Markdown
filename: tif_luv.c
change_type: ModificationType.MODIFY
diff: @@ -158,6 +158,7 @@
 typedef struct logLuvState LogLuvState;
 
 struct logLuvState {
+        int                     encoder_state;  /* 1 if encoder correctly initialized */
 	int                     user_datafmt;   /* user data format */
 	int                     encode_meth;    /* encoding method */
 	int                     pixel_size;     /* bytes per pixel */
@@ -1552,6 +1553,7 @@ LogLuvSetupEncode(TIFF* tif)
 		    td->td_photometric, "must be either LogLUV or LogL");
 		break;
 	}
+	sp->encoder_state = 1;
 	return (1);
 notsupported:
 	TIFFErrorExt(tif->tif_clientdata, module,
@@ -1563,19 +1565,27 @@ notsupported:
 static void
 LogLuvClose(TIFF* tif)
 {
+        LogLuvState* sp = (LogLuvState*) tif->tif_data;
 	TIFFDirectory *td = &tif->tif_dir;
 
+	assert(sp != 0);
 	/*
 	 * For consistency, we always want to write out the same
 	 * bitspersample and sampleformat for our TIFF file,
 	 * regardless of the data format being used by the application.
 	 * Since this routine is called after tags have been set but
 	 * before they have been recorded in the file, we reset them here.
+         * Note: this is really a nasty approach. See PixarLogClose
 	 */
-	td->td_samplesperpixel =
-	    (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3;
-	td->td_bitspersample = 16;
-	td->td_sampleformat = SAMPLEFORMAT_INT;
+        if( sp->encoder_state )
+        {
+            /* See PixarLogClose. Might avoid issues with tags whose size depends
+             * on those below, but not completely sure this is enough. */
+            td->td_samplesperpixel =
+                (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3;
+            td->td_bitspersample = 16;
+            td->td_sampleformat = SAMPLEFORMAT_INT;
+        }
 }
 
 static void

programming_language: C
filename: tif_pixarlog.c
change_type: ModificationType.MODIFY
diff: @@ -1233,8 +1233,10 @@ PixarLogPostEncode(TIFF* tif)
 static void
 PixarLogClose(TIFF* tif)
 {
+        PixarLogState* sp = (PixarLogState*) tif->tif_data;
 	TIFFDirectory *td = &tif->tif_dir;
 
+	assert(sp != 0);
 	/* In a really sneaky (and really incorrect, and untruthful, and
 	 * troublesome, and error-prone) maneuver that completely goes against
 	 * the spirit of TIFF, and breaks TIFF, on close, we covertly
@@ -1243,8 +1245,19 @@ PixarLogClose(TIFF* tif)
 	 * readers that don't know about PixarLog, or how to set
 	 * the PIXARLOGDATFMT pseudo-tag.
 	 */
-	td->td_bitspersample = 8;
-	td->td_sampleformat = SAMPLEFORMAT_UINT;
+
+        if (sp->state&PLSTATE_INIT) {
+            /* We test the state to avoid an issue such as in
+             * http://bugzilla.maptools.org/show_bug.cgi?id=2604
+             * What appends in that case is that the bitspersample is 1 and
+             * a TransferFunction is set. The size of the TransferFunction
+             * depends on 1<<bitspersample. So if we increase it, an access
+             * out of the buffer will happen at directory flushing.
+             * Another option would be to clear those targs. 
+             */
+            td->td_bitspersample = 8;
+            td->td_sampleformat = SAMPLEFORMAT_UINT;
+        }
 }
 
 static void

programming_language: C