ImageMagick before 7.0.8-50 has a "use of uninitialized value" vulnerability in the function ReadCUTImage in coders/cut.c.
### Prerequisites

- [ y ] I have written a descriptive issue title
- [ y ] I have verified that I am using the latest version of ImageMagick
- [ y ] I have searched [open](https://github.com/ImageMagick/ImageMagick/issues) and [closed](https://github.com/ImageMagick/ImageMagick/issues?q=is%3Aissue+is%3Aclosed) issues to ensure it has not already been reported

### Description
<!-- A description of the bug or feature -->


```
  /* ----- Load RLE compressed raster ----- */
  BImgBuff=(unsigned char *) AcquireQuantumMemory((size_t) ldblk,
    sizeof(*BImgBuff));  /*Ldblk was set in the check phase*/
  if(BImgBuff==NULL) goto NoMemory;

  offset=SeekBlob(image,6 /*sizeof(Header)*/,SEEK_SET);
```
(https://github.com/ImageMagick/ImageMagick/blob/master/coders/cut.c#L552)

We should initialize the BImgBuff, otherwise an use-of-uninitialized vulnerability occurs, which is similar to https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6780 (fixed in https://github.com/ImageMagick/ImageMagick/commit/a85ab26099152be3dab0bd377670abfc815b9fe7 and https://github.com/ImageMagick/ImageMagick/commit/81bfff2759854654bf07e452bf3b9b329f3c55e5 ) and https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5710 (fixed in https://github.com/ImageMagick/ImageMagick/commit/ce433f8048b120b2a0413b4ac3ef59fca35a9788 and https://github.com/ImageMagick/ImageMagick/commit/81bfff2759854654bf07e452bf3b9b329f3c55e5).


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Use of uninitialized value in function ReadCUTImage
This is a GitHub Issue
repo:ImageMagick
owner:ImageMagick
Title : Use of uninitialized value in function ReadCUTImage
Issue date:

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### Prerequisites

- [ y ] I have written a descriptive issue title
- [ y ] I have verified that I am using the latest version of ImageMagick
- [ y ] I have searched [open](https://github.com/ImageMagick/ImageMagick/issues) and [closed](https://github.com/ImageMagick/ImageMagick/issues?q=is%3Aissue+is%3Aclosed) issues to ensure it has not already been reported

### Description
<!-- A description of the bug or feature -->


```
  /* ----- Load RLE compressed raster ----- */
  BImgBuff=(unsigned char *) AcquireQuantumMemory((size_t) ldblk,
    sizeof(*BImgBuff));  /*Ldblk was set in the check phase*/
  if(BImgBuff==NULL) goto NoMemory;

  offset=SeekBlob(image,6 /*sizeof(Header)*/,SEEK_SET);
```
(https://github.com/ImageMagick/ImageMagick/blob/master/coders/cut.c#L552)

We should initialize the BImgBuff, otherwise an use-of-uninitialized vulnerability occurs, which is similar to https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6780 (fixed in https://github.com/ImageMagick/ImageMagick/commit/a85ab26099152be3dab0bd377670abfc815b9fe7 and https://github.com/ImageMagick/ImageMagick/commit/81bfff2759854654bf07e452bf3b9b329f3c55e5 ) and https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5710 (fixed in https://github.com/ImageMagick/ImageMagick/commit/ce433f8048b120b2a0413b4ac3ef59fca35a9788 and https://github.com/ImageMagick/ImageMagick/commit/81bfff2759854654bf07e452bf3b9b329f3c55e5).


<!-- Thanks for reporting the issue to ImageMagick! -->

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