Python 已经成为全球最受欢迎的编程语言之一。原因当然是 Python 简明易用的脚本语法,只需把一段程序放入 .py 文件中,就能快速运行
而且 Python 语言很容易上手模块。比如你编写了一个模块my_lib.py
,只需在调用这个模块的程序中加入一行import my_lib
即可
这样设计的好处是,初学者能够非常方便地执行命令。但是对攻击者来说,这等于是为恶意程序大开后门
尤其是一些初学者将网上的 Python 软件包、代码下载的到本地~/Downloads
文件夹后,就直接在此路径下运行 python 命令,这样做会给电脑带来极大的隐患
别再图方便了
为何这样做会有危险?首先,我们要了解 Python 程序安全运行需要满足的三个条件:
-
系统路径上的每个条目都处于安全的位置
-
“主脚本” 所在的目录始终位于系统路径中
-
若 python 命令使用 -c 和 -m 选项,调用程序的目录也必须是安全的
如果你运行的是正确安装的 Python,那么Python 安装目录和 virtualenv 之外唯一会自动添加到系统路径的位置,就是当前主程序的安装目录
这就是安全隐患的来源,下面用一个实例告诉你为什么
如果你把 pip 安装在 /usr/bin
文件夹下,并运行 pip 命令,由于/usr/bin
是系统路径,因此这是一个非常安全的地方
但是,有些人并不喜欢直接使用 pip,而是更喜欢调用 /path/to/python -m pip
这样做的好处是可以避免环境变量 $PATH
设置的复杂性,而且对于 Windows 用户来说,也可以避免处理安装各种 exe 脚本和文档
所以问题就来了,如果你的下载文件中有一个叫做 pip.py 的文件,那么你将它将取代系统自带的 pip,接管你的程序
下载文件夹并不安全
比如你不是从 PyPI,而是直接从网上直接下载了一个 Python wheel 文件,你很自然地输入以下命令来安装它:
这似乎是一件很合理的事情
但你不知道的是,这么操作很有可能访问带有 XSS JavaScript 的站点,并将带有恶意软件的的pip.py
到下载文件夹中
下面是一个恶意攻击软件的演示实例:
看到了吗?这段代码生成了一个 pip.py,并且代替系统的 pip 接管了程序
设置$PYTHONPATH也不安全
前面已经说过,Python 只会调用系统路径、virtualenv 虚拟环境路径以及当前主程序路径
你也许会说,那我手动设置一下 $PYTHONPATH
环境变量,不把当前目录放在环境变量里,这样不就安全了吗?
非也!不幸的是,你可能会遭遇另一种攻击方式。下面让我们模拟一个“脆弱的” Python 程序:
然后创建 2 个目录:install_dir和attacker_dir。将上面的程序放在 install_dir 中
然后 cd attacker_dir 将复杂的恶意软件放在这里,并把它的名字改成 tool.py 调用的 optional_extra 模块:
我们运行一下它:
到这里还很好,没有出现任何问题
但是这个习惯用法有一个严重的缺陷:第一次调用它时,如果 $PYTHONPATH
以前是空的或者未设置,那么它会包含一个空字符串,该字符串被解析为当前目录
让我们再尝试一下:
看到了吗?恶意脚本接管了程序
为了安全起见,你可能会认为,清空 $PYTHONPATH
总该没问题了吧?Naive!还是不安全!
这里发生的事情是,$PYTHONPATH
变成空的了,这和 unset 是不一样的
因为在Python里,os.environ.get(“PYTHONPATH”) == “”
和 os.environ.get(“PYTHONPATH”) == None
是不一样的
如果要确保 $PYTHONPATH
已从 shell 中清除,则需要使用 unset 命令处理一遍,然后就正常了
设置$PYTHONPATH
曾经是设置 Python 开发环境的最常用方法。但你以后最好别再用它了,virtualenv 可以更好地满足开发者需求。如果你过去设置了一个$PYTHONPATH
,现在是很好的机会,把它删除了吧
如果你确实需要在 shell 中使用 PYTHONPATH,请用以下方法:
在bash和zsh中,$PYTHONPATH
变量的值会变成:
如此便保证了环境变量 $PYTHONPATH
中没有空格和多余的冒号。
如果你仍在使用 $PYTHONPATH,请确保始终使用绝对路径!
另外,在下载文件夹中直接运行 Jupyter Notebook 也是一样危险的,比如jupyter notebook ~/Downloads/anything.ipynb
也有可能将恶意程序引入到代码中。
预防措施
最后总结一下要点。
-
如果要在下载文件夹 ~/Downloads 中使用 Python 编写的工具,请养成良好习惯,使用pip所在路径
/path/to/venv/bin/pip
,而不是输入/path/to/venv/bin/python -m pip
-
避免将 ~/Downloads 作为当前工作目录,并在启动之前将要使用的任何软件移至更合适的位置
了解 Python 从何处获取执行代码非常重要,赋予其他人执行任意 Python 命令的能力等同于赋予他对你电脑的完全控制权
希望以上文字对初学 Python 的你有所帮助!
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0, 0)" data-darkmode-bgcolor-15900529136199="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15900529136199="rgb(255, 255, 255)" data-darkmode-color-15900529136199="rgb(230, 230, 230)" data-darkmode-original-color-15900529136199="rgb(0, 0, 0)" style="display: inline-block;clear: both;"><section data-brushtype="text" data-darkmode-bgcolor-15860613985508="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15860613985508="rgb(255, 255, 255)" data-darkmode-color-15860613985508="rgb(230, 230, 230)" data-darkmode-original-color-15860613985508="rgb(0, 0, 0)" data-darkmode-bgimage-15860613985508="1" data-style="padding: 18px 15px 20px 10px; color: rgb(86, 146, 214); text-align: center; letter-spacing: 1.5px; background-image: url('https://www.zkxjob.com/wp-content/uploads/2022/06/wxsync-2022-06-a2a8a5e1e58f30392066a170034ee027.png'); background-size: 100% 100%; background-repeat: no-repeat; overflow-wrap: break-word !important;" data-darkmode-bgcolor-15870356070738="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356070738="rgb(255, 255, 255)" data-darkmode-color-15870356070738="rgb(230, 230, 230)" data-darkmode-original-color-15870356070738="rgb(0, 0, 0)" data-darkmode-bgimage-15870356070738="1" data-darkmode-bgcolor-15870356071023="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356071023="rgb(255, 255, 255)" data-darkmode-color-15870356071023="rgb(230, 230, 230)" data-darkmode-original-color-15870356071023="rgb(0, 0, 0)" data-darkmode-bgimage-15870356071023="1" data-darkmode-bgcolor-15882384789136="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882384789136="rgb(255, 255, 255)" data-darkmode-color-15882384789136="rgb(230, 230, 230)" data-darkmode-original-color-15882384789136="rgb(0, 0, 0)" data-darkmode-bgimage-15882384789136="1" data-darkmode-bgcolor-15882396318564="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882396318564="rgb(255, 255, 255)" data-darkmode-color-15882396318564="rgb(230, 230, 230)" 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data-darkmode-original-color-15882396318564="rgb(0, 0, 0)" data-darkmode-bgimage-15882396318564="1" data-darkmode-bgcolor-15900529136199="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15900529136199="rgb(255, 255, 255)" data-darkmode-color-15900529136199="rgb(230, 230, 230)" data-darkmode-original-color-15900529136199="rgb(0, 0, 0)" data-darkmode-bgimage-15900529136199="1" style="display: flex;justify-content: center;align-items: center;"><section data-darkmode-bgcolor-15860613985508="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15860613985508="rgb(255, 255, 255)" data-darkmode-color-15860613985508="rgb(230, 230, 230)" data-darkmode-original-color-15860613985508="rgb(0, 0, 0)" data-darkmode-bgimage-15860613985508="1" data-darkmode-bgcolor-15870356070738="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356070738="rgb(255, 255, 255)" data-darkmode-color-15870356070738="rgb(230, 230, 230)" data-darkmode-original-color-15870356070738="rgb(0, 0, 0)" data-darkmode-bgimage-15870356070738="1" data-darkmode-bgcolor-15870356071023="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356071023="rgb(255, 255, 255)" data-darkmode-color-15870356071023="rgb(230, 230, 230)" data-darkmode-original-color-15870356071023="rgb(0, 0, 0)" data-darkmode-bgimage-15870356071023="1" data-darkmode-bgcolor-15882384789136="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882384789136="rgb(255, 255, 255)" data-darkmode-color-15882384789136="rgb(230, 230, 230)" data-darkmode-original-color-15882384789136="rgb(0, 0, 0)" data-darkmode-bgimage-15882384789136="1" data-darkmode-bgcolor-15882396318564="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882396318564="rgb(255, 255, 255)" data-darkmode-color-15882396318564="rgb(230, 230, 230)" data-darkmode-original-color-15882396318564="rgb(0, 0, 0)" data-darkmode-bgimage-15882396318564="1" data-darkmode-bgcolor-15900529136199="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15900529136199="rgb(255, 255, 255)" data-darkmode-color-15900529136199="rgb(230, 230, 230)" data-darkmode-original-color-15900529136199="rgb(0, 0, 0)" data-darkmode-bgimage-15900529136199="1" style="margin-left: 2px;width: 20px;"></section><section data-brushtype="text" data-darkmode-bgcolor-15860613985508="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15860613985508="rgb(255, 255, 255)" data-darkmode-color-15860613985508="rgb(51, 51, 51)" data-darkmode-original-color-15860613985508="rgb(51, 51, 51)" data-darkmode-bgimage-15860613985508="1" data-darkmode-bgcolor-15870356070738="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356070738="rgb(255, 255, 255)" data-darkmode-color-15870356070738="rgb(51, 51, 51)" data-darkmode-original-color-15870356070738="rgb(51, 51, 51)" data-darkmode-bgimage-15870356070738="1" data-darkmode-bgcolor-15870356071023="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356071023="rgb(255, 255, 255)" data-darkmode-color-15870356071023="rgb(51, 51, 51)" data-darkmode-original-color-15870356071023="rgb(51, 51, 51)" data-darkmode-bgimage-15870356071023="1" data-darkmode-bgcolor-15882384789136="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882384789136="rgb(255, 255, 255)" data-darkmode-color-15882384789136="rgb(51, 51, 51)" data-darkmode-original-color-15882384789136="rgb(51, 51, 51)" data-darkmode-bgimage-15882384789136="1" data-darkmode-bgcolor-15882396318564="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882396318564="rgb(255, 255, 255)" data-darkmode-color-15882396318564="rgb(51, 51, 51)" data-darkmode-original-color-15882396318564="rgb(51, 51, 51)" data-darkmode-bgimage-15882396318564="1" data-darkmode-bgcolor-15900529136199="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15900529136199="rgb(255, 255, 255)" data-darkmode-color-15900529136199="rgb(51, 51, 51)" data-darkmode-original-color-15900529136199="rgb(51, 51, 51)" data-darkmode-bgimage-15900529136199="1" style="font-size: 14px;color: rgb(51, 51, 51);text-align: left;"><span style="font-family: 楷体, 楷体_GB2312, SimKai;font-size: 15px;">点这里,获取新手福利</span></section></section></section></section></section></section></section>
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