ImageMagick popen_utf8命令注入 漏洞报告
Author: niubl（知道创宇404安全实验室）
Date: 2016-05-07
一、漏洞概要
i. 漏洞描述
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。我发现当用户传入一个包含|竖线的文件名的时候，就有可能触发命令注入漏洞。
ii. 漏洞影响
测试：ImageMagick-7.0.1-2.tar.bz2
iii. 漏洞分析
ImageMagick在处理文件名时会调用OpenBlob()函数，在OpenBlob()函数中，代码2484行，判断文件名是否以|竖线开头，如果是，那么他会调用popoen_utf8()函数处理文件名，代码如图：
来到popoen_utf8()函数，popen_utf8()函数调用会调用popen()函数打开文件，这样就导致我们可以注入系统命令，代码如图：
iv. 漏洞利用（PHP）
在PHP禁用执行系统命令函数的时候，我们可以用他来绕过disable_funtion，PHP编写如下代码：
<?phpnew Imagick('|touch /tmp/niubl');?>使用PHP执行，结果如图：
二、修复方案
目前官方已经更新代码至 Gitlab，但最终修复版本还未发布，补丁细节可参考如下链接：
- http://git.imagemagick.org/repos/ImageMagick/commit/40639d173aa8c76b850d625c630b711fee4dcfb
- http://git.imagemagick.org/repos/ImageMagick/commit/4674b3e1ea87a69646a6dbac8772c45eeb20c9f0
三、漏洞时间线
2016.05.07 知道创宇404安全实验室niubl发现该漏洞
2016.05.29 国外研究者报告并公布了漏洞细节 http://permalink.gmane.org/gmane.comp.security.oss.general/19669
2016.05.30 发布分析报告
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