CVE-2016-5689 (published 2016-12-13T15:59Z)

The DCM reader in ImageMagick before 6.9.4-5 and 7.x before 7.0.1-7 allows remote attackers to have unspecified impact by leveraging lack of NULL pointer checks.

Severity: HIGH
CVSS v2 base score: 7.5 (AV:N/AC:L/Au:N/C:P/I:P/A:P)
CVSS v3 base score: 9.8, CRITICAL (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Weakness information:
cwe_id: CWE-476
cwe_name: NULL Pointer Dereference
description: The product dereferences a pointer that it expects to be valid but is NULL.
extended_description: 
            
            
            
         
         

Fix information:
repo_url: https://github.com/ImageMagick/ImageMagick
commit_details: repo_url: https://github.com/ImageMagick/ImageMagick
author: Cristy
author_date: 2016-05-30 07:51:39-04:00
msg: Add additional checks to DCM reader to prevent data-driven faults (bug report from Hanno Böck
repository: repo_url: https://github.com/ImageMagick/ImageMagick
repo_name: ImageMagick/ImageMagick
description: 🧙‍♂️ ImageMagick 7
repo_language: C
owner: ImageMagick
file_changes: filename: ChangeLog
change_type: ModificationType.MODIFY
diff: @@ -5,6 +5,8 @@
     https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=29626).
   * Don't interpret -fx option arguments (reference
     https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=29774);
+  * Add additional checks to DCM reader to prevent data-driven faults (bug
+    report from Hanno Böck).
 
 2016-05-21  7.0.1-6 Cristy  <quetzlzacatenango@image...>
   * Release ImageMagick version 7.0.1-6, GIT revision 18241:d4f277c:20160521.

programming_language: Markdown
filename: dcm.c
change_type: ModificationType.MODIFY
diff: @@ -3216,6 +3216,8 @@ static Image *ReadDCMImage(const ImageInfo *image_info,ExceptionInfo *exception)
             /*
               Photometric interpretation.
             */
+            if (data == (unsigned char *) NULL)
+              break;
             for (i=0; i < (ssize_t) MagickMin(length,MagickPathExtent-1); i++)
               photometric[i]=(char) data[i];
             photometric[i]='\0';
@@ -3237,6 +3239,8 @@ static Image *ReadDCMImage(const ImageInfo *image_info,ExceptionInfo *exception)
             /*
               Number of frames.
             */
+            if (data == (unsigned char *) NULL)
+              break;
             number_scenes=StringToUnsignedLong((char *) data);
             break;
           }
@@ -3674,7 +3678,7 @@ static Image *ReadDCMImage(const ImageInfo *image_info,ExceptionInfo *exception)
       if (scale == (Quantum *) NULL)
         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
       range=GetQuantumRange(depth);
-      for (i=0; i < (ssize_t) (GetQuantumRange(depth)+1); i++)
+      for (i=0; i <= (ssize_t) GetQuantumRange(depth); i++)
         scale[i]=ScaleAnyToQuantum((size_t) i,range);
     }
   if (image->compression == RLECompression)
@@ -3965,9 +3969,12 @@ static Image *ReadDCMImage(const ImageInfo *image_info,ExceptionInfo *exception)
                 pixel.blue&=mask;
                 if (scale != (Quantum *) NULL)
                   {
-                    pixel.red=scale[pixel.red];
-                    pixel.green=scale[pixel.green];
-                    pixel.blue=scale[pixel.blue];
+                    if (pixel.red <= GetQuantumRange(depth))
+                      pixel.red=scale[pixel.red];
+                    if (pixel.green <= GetQuantumRange(depth))
+                      pixel.green=scale[pixel.green];
+                    if (pixel.blue <= GetQuantumRange(depth))
+                      pixel.blue=scale[pixel.blue];
                   }
               }
             SetPixelRed(image,(Quantum) pixel.red,q);

programming_language: C++