oss-security - information on "ImageMagick PSD Images Processing RLE Decoding Buffer Overflow Vulnerability"

Follow @Openwall on Twitter for new release announcements and other news

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <52FAD5B9.1060603@redhat.com>
Date: Wed, 12 Feb 2014 13:00:25 +1100
From: Murray McAllister <mmcallis@...hat.com>
To: oss-security@...ts.openwall.com
Subject: information on "ImageMagick PSD Images Processing RLE Decoding Buffer
 Overflow Vulnerability"

Good morning,

Does anyone have further information about 
<http://secunia.com/advisories/56844/>? (I could not get the 
http://freecode.com/projects/imagemagick/tags/bugfixes link to show 
anything useful.)

diffing ImageMagick-6.8.7/coders/psd.c ImageMagick-6.8.8/coders/psd.c:

""
@@ -1224,7 +1224,7 @@
                Allocate layered image.
              */
              layer_info[i].image=CloneImage(image,layer_info[i].page.width,
-              layer_info[i].page.height == ~0U ? 1 : 
layer_info[i].page.height,
+              layer_info[i].page.height == ~0UL ? 1 : 
layer_info[i].page.height,
                MagickFalse,&image->exception);
              if (layer_info[i].image == (Image *) NULL)
                {
@@ -2112,9 +2112,6 @@
    StringInfo
      *bim_profile;

-  unsigned char
-    layer_name[4];
-
    /*
      Open image file.
    */
@@ -2372,12 +2369,15 @@
          property=(const char *) GetImageProperty(next_image,"label");
          if (property == (const char *) NULL)
            {
+            char
+              layer_name[MaxTextExtent];
+
              (void) WriteBlobMSBLong(image,16);
              (void) WriteBlobMSBLong(image,0);
              (void) WriteBlobMSBLong(image,0);
-            (void) FormatLocaleString((char *) layer_name,MaxTextExtent,
-              "L%06ld",(long) layer_count++);
-            WritePascalString( image, (char*)layer_name, 4 );
+            (void) 
FormatLocaleString(layer_name,MaxTextExtent,"L%06ld",(long)
+              layer_count++);
+            WritePascalString(image,layer_name,4);
            }
          else
            {

""

Would the issue have been writing the amount of 6 long ints into the 4 
byte layer_name buffer?

Having a (very brief) look at ImageMagick-6.5.4 on RHEL 6, it's using 
"L%02ld" instead of "L%06ld", but that's still 4 bytes too many before 
the layer_name[MaxTextExtent]; change.

Could a CVE please be assigned if it has not been already?

Sorry for missing anything obvious.

--
Murray McAllister / Red Hat Security Response Team

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.