memory leak in ReadXWDImage

[bestshow]

on ImageMagick 7.0.5-5

The ReadXWDImage function in xwd.c:325 allows attackers to cause a denial of service (memory leak) via a crafted file.

#identify $FILE

Direct leak of 4608 byte(s) in 1 object(s) allocated from:
#0 0x7fd2dbfdcb58 in __interceptor_malloc ../../../../libsanitizer/asan/asan_malloc_linux.cc:62
#1 0x43ecdb in AcquireMagickMemory MagickCore/memory.c:463
#2 0x43ed2f in AcquireQuantumMemory MagickCore/memory.c:536
#3 0x768c81 in ReadXWDImage coders/xwd.c:325
#4 0x7f27a7 in ReadImage MagickCore/constitute.c:497
#5 0x9e41a7 in ReadStream MagickCore/stream.c:1045
#6 0x7f1855 in PingImage MagickCore/constitute.c:226
#7 0x7f1e08 in PingImages MagickCore/constitute.c:327
#8 0xbb97b4 in IdentifyImageCommand MagickWand/identify.c:319
#9 0xc10308 in MagickCommandGenesis MagickWand/mogrify.c:183
#10 0x40f839 in MagickMain utilities/magick.c:149
#11 0x40fa06 in main utilities/magick.c:180
#12 0x7fd2d72ebb34 in __libc_start_main (/lib64/libc.so.6+0x21b34)

4608 byte(s) leaked in 1 allocation(s).
testcase:https://github.com/bestshow/p0cs/blob/master/memory-leak-in-ReadXWDImage-13.xwd
Author: ADLab of Venustech

[mikayla-grace]

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.

[carnil]

This has been assigned CVE-2017-8352