Walks

网络安全爱好者

浅谈CORS可能产生的漏洞

前言:

转眼两个月过去了,博客一直都没有更新。重新捡起自己的博客,在写写自己的学习过程。

这次要说的是由于CORS配置不当而引起的跨域问题。CORS,翻译过来就是“跨域资源共享”,这里的重点在于跨域,要知道在网络安全里面,同源策略是一个很重要的东西。而这个跨域就打破了这个特性,从而可能会造成一些问题。但其实CORS本意是用来避免这些安全问题的。

这里就不重复说一些原理类的问题了。毕竟百度上面很多。


目录:

0x01:漏洞原因

0x02:漏洞危害


漏洞原因

    由于配置不当,Origin源未严格,从而造成跨域问题。

    这样说可能有点抽象,我来举个实例。

    这里假设以下访问都是基于自己的博客bywalks.com这个源,当我们发送下面这个请求包时

GET /c/user HTTP/1.1
Host: bywalks.com
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:46.0) Gecko/20100101 Firefox/46.0
Accept: */*
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Content-Type: application/json
origin: http://evil.com

    返回包如下

HTTP/1.1 304 Not Modified
Date: Thu, 08 Mar 2018 02:48:00 GMT
Connection: close
ETag: "ba948d94315604d965963bffecb2582a"
Cache-Control: max-age=0, private, must-revalidate
X-Request-Id: f2b00bc9-8cc5-493c-86e9-2c4e0f438553
Access-Control-Allow-Origin: http://evil.com
Access-Control-Allow-Methods: GET, POST, PUT, OPTIONS, DELETE
Access-Control-Expose-Headers: 
Access-Control-Max-Age: 1728000
Access-Control-Allow-Credentials: true
Vary: Origin
Strict-Transport-Security: max-age=631152000
Referrer-Policy: origin-when-cross-origin
X-Content-Type-Options: nosniff
X-Download-Options: noopen
X-Frame-Options: SAMEORIGIN
X-Permitted-Cross-Domain-Policies: none
X-XSS-Protection: 1; mode=block

    上面的请求包,我们只要关注Origin即可。当我们把Origin设置为evil.com时,返回包的Access-Control-Allow-Origin也为evil.com,也就是evil.com可以跨域获取我的个人博客bywalks.com的资源。从而产生了CORS配置不当的漏洞。

    Access-Control-Allow-Credentials: true这个设置是请求包中是否携带cookie。

    

    漏洞危害

    造成跨域问题,可能造成信息泄露等危害。

    这里在给大家两个网址,一个是讲CORS原理,一个是hackerone上面的漏洞挖掘例子。

    http://www.ruanyifeng.com/blog/2016/04/cors.html

    https://bugbountypoc.com/exploiting-cross-origin-resource-sharing/

    

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