生活大爆炸第六季

上传目录变后门温床：三招封死WebShell上传_我的网站

A |     In one of her first interviews following her trip to Taiwan, which attracted global attention, US House of Representatives Speaker Nancy Pelosi made a remarkable slip of the tongue by referring to China as "one of the freest societies in the world" on Tuesday.,In an interview with NBC's "Today," Pelosi claimed she supported the "one China" policy, but she also reportedly made an embarrassing error that has amused many people online.,"We still support the 'one China' policy, we go there to acknowledge the status quo is what our policy is, there is nothing disruptive about that. It was only about saying, China is one of the freest societies in the world, don't take it from me, that's from Freedom House, it's a strong democracy, courageous people," said Pelosi.,Obviously, it was not what she had intended to say. However, the cat is out of the bag.,The dramatic shift in sentiment is particularly striking given that the California Democrat earlier in the day lambasted Chinese President Xi Jinping as a "scared bully.",Drew Hammill, Pelosi's deputy chief of staff, took to social media shortly after she made the gaffe to clarify the situation and present her original position. Apparently, she was speaking of Freedom House's "Freedom in the World" report from 2021, which gave Taiwan a "global freedom score" of 94 out of 100. In contrast, the DC-based NGO's website has categorized China and its communist leadership as an "authoritarian regime.","The Speaker is referencing Taiwan. The Speaker’s record of speaking out against the Chinese Communist Party for 35 years in the Congress is unsurpassed," Hammill said.,And while Pelosi herself has said she has no regrets about the trip, China's Foreign Ministry has announced sanctions against the speaker and her immediate family for visiting Taiwan.。

B |     

　    一键部署OpenClaw        WebShell最常见的落地方式不是直接攻破服务器，而是通过上传功能把脚本文件传上去。图片上传、头像上传、附件上传，只要后缀没校验好，就可能变成木马的入口。    

    第一招是校验文件头。不能只看扩展名，jpg/png都有固定文件头，用PHP的getimagesize或者Python的imghdr可以识别真伪。    第二招是重命名文件，把用户上传的文件名换成随机字符串，不让原始文件名执行。    

        
$info = getimagesize($_FILES['file']['tmp_name']);
if (!$info || !in_array($info[2], [IMAGETYPE_JPEG, IMAGETYPE_PNG, IMAGETYPE_GIF])) {
 exit('仅允许上传图片');
}
 
$ext = image_type_to_extension($info[2], true);
$save_name = md5(uniqid()) . $ext;
move_uploaded_file($_FILES['file']['tmp_name'], '/upload/' . $save_name);
?>

    第三招是Web服务器层直接禁止执行。上传目录只读、不执行任何脚本，木马传上来也跑不起来。这是最后一道防线，必须做。    # Nginx：上传目录禁止脚本执行    location ^~ /upload/ {    location ~ \*\.(php|php5|phtml|asp|aspx|cer|jsp)$ {    deny all;    }    }    # IIS：在处理程序映射里删除上传目录的脚本映射，或在web.config中加规则    数据来源：OWASP文件上传安全指南、Nginx官方location匹配文档             

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Published on:07:00:38