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CPU exhaustion in ReadOneMNGImage #527

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jgj212 opened this issue Jun 24, 2017 · 1 comment

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commented Jun 24, 2017

Version: ImageMagick 7.0.6-1 Q16 x86_64

$magick identify $FILE

Here is the critical code

            for (i=0; i < (ssize_t) length; i++)  //line 5247
              chunk[i]=(unsigned char) ReadBlobByte(image);

length can be controlled as follow:

        length=ReadBlobMSBLong(image); //5217

length is 32bit, so the loop can be very large, and cause a lot of failed I/O

testcase:
https://github.com/jgj212/poc/blob/master/cpu-mng

Credit: ADLab of Venustech

@mikayla-grace

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commented Jun 24, 2017

Thanks for the problem report. We can reproduce it and will have a patch to fix it in GIT master branch @ https://github.com/ImageMagick/ImageMagick later today. The patch will be available in the beta releases of ImageMagick @ http://www.imagemagick.org/download/beta/ by sometime tomorrow.

dlemstra pushed a commit that referenced this issue Jun 24, 2017

Cristy

dlemstra pushed a commit that referenced this issue Jun 24, 2017

Cristy

@dlemstra dlemstra added the bug label Jul 2, 2017

@dlemstra dlemstra closed this Jul 2, 2017

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