Nginx升级加固SSL/TLS协议信息泄露漏洞(CVE-2016-2183)和HTTP服务器的缺省banner漏洞

// 基于Nginx的https网站被扫描出SSL/TLS协议信息泄露漏洞(CVE-2016-2183)，该漏洞是在安装Nginx时build的Openssl版本问题导致的漏洞，
// 需要重新编译安装Nginx并指定版本的Openssl（可以不升级系统的openssl，编译过程中只要指定新的openssl路径即可）。

[root@server ~]# nginx -V
nginx version: nginx/1.16.1
built by gcc 4.8.5 20150623 (Red Hat 4.8.5-39) (GCC) 
built with OpenSSL 1.0.2k-fips  26 Jan 2017
TLS SNI support enabled

cd /tmp
wget  https://www.openssl.org/source/openssl-1.1.0k.tar.gz
tar zxvf openssl-1.1.0k.tar.gz -C /usr/local

yum install -y gcc gcc-c++ openssl-devel pcre-devel make zlib-devel wget 

wget http://nginx.org/download/nginx-1.14.2.tar.gz

cd /root/nginx-1.14.2
 
./configure --prefix=/usr/local/nginx1.14 --with-http_ssl_module --with-http_stub_status_module --with-openssl=/usr/local/openssl-1.1.0k

make && make install 

# 错误信息
/bin/sh: line 2: ./config: No such file or directory
make[1]: *** [/usr/local/ssl/.openssl/include/openssl/ssl.h] Error 127
make[1]: Leaving directory `/usr/local/src/nginx-1.9.9'
make: *** [build] Error 2

# 打开nginx源文件下的/usr/local/src/nginx-1.9.9/auto/lib/openssl/conf文件：
vi /root/nginx-1.14.2/auto/lib/openssl/conf 


# 找到以下代码,差不多三四十行
CORE_INCS="$CORE_INCS $OPENSSL/.openssl/include"
CORE_DEPS="$CORE_DEPS $OPENSSL/.openssl/include/openssl/ssl.h"
CORE_LIBS="$CORE_LIBS $OPENSSL/.openssl/lib/libssl.a"
CORE_LIBS="$CORE_LIBS $OPENSSL/.openssl/lib/libcrypto.a"
CORE_LIBS="$CORE_LIBS $NGX_LIBDL"



# 修改成以下代码
CORE_INCS="$CORE_INCS $OPENSSL/include"
CORE_DEPS="$CORE_DEPS $OPENSSL/include/openssl/ssl.h"
CORE_LIBS="$CORE_LIBS $OPENSSL/lib/libssl.a"
CORE_LIBS="$CORE_LIBS $OPENSSL/lib/libcrypto.a"
CORE_LIBS="$CORE_LIBS $NGX_LIBDL"

[root@JD sbin]# ./nginx -V
nginx version: nginx/1.14.2
built by gcc 4.8.5 20150623 (Red Hat 4.8.5-39) (GCC) 
built with OpenSSL 1.1.0k  28 May 2019
TLS SNI support enabled
configure arguments: --prefix=/usr/local/nginx1.14 --with-http_ssl_module --with-http_stub_status_module --with-openssl=/usr/local/openssl-1.1.0k

# 在http{}里面加上
http {
    include       mime.types;
    default_type  application/octet-stream;
    server_tokens off;
# 隐藏php版本只需要在php.ini配置文件修改expose_php = On改为expose_php=Off    
    
    
# 但是我们访问时候还是能看到关键信息,让人窃取到你使用的是nginx

[root@JD nginx-1.14.2]# curl  localhost -I
HTTP/1.1 200 OK
Server: nginx
Date: Wed, 09 Sep 2020 13:36:34 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Wed, 09 Sep 2020 13:08:03 GMT
Connection: keep-alive
ETag: "5f58d3b3-264"
Accept-Ranges: bytes

# 我们可以隐藏掉server信息也可以制造假的server迷惑攻击者
# 修改第一个配置文件为nginx.h
ls /usr/local/src/nginx-1.12.2/
auto     CHANGES.ru  configure  html     Makefile  objs    src
CHANGES  conf        contrib    LICENSE   man       README
# 我们找到当初make之前的那个源码包
cd /usr/local/src/nginx-1.12.2/src/
vim core/nginx.h        # 修改下面三行
#define nginx_version      1012002
#define NGINX_VERSION      "7.0"
#define NGINX_VER          "IIS/" NGINX_VERSION
#ifdef NGX_BUILD
#define NGINX_VER_BUILD    NGINX_VER " (" NGX_BUILD ")"
#else
#define NGINX_VER_BUILD    NGINX_VER
#endif
#define NGINX_VAR          "IIS"

# OR


#define nginx_version      1014002
#define NGINX_VERSION      ""
#define NGINX_VER          "UNKNOW/" NGINX_VERSION

#ifdef NGX_BUILD
#define NGINX_VER_BUILD    NGINX_VER " (" NGX_BUILD ")"
#else
#define NGINX_VER_BUILD    NGINX_VER
#endif

#define NGINX_VAR          "NGINX"
#define NGX_OLDPID_EXT     ".oldbin"
#endif /* _NGINX_H_INCLUDED_ */



# 修改第二个配置文件为ngx_http_header_filter_module.c,49行
grep IIS http/ngx_http_header_filter_module.c
static u_char ngx_http_server_string[] = "Server:IIS" CRLF;


# OR

static u_char ngx_http_server_string[] = "" CRLF;
static u_char ngx_http_server_full_string[] = "" NGINX_VER CRLF;
static u_char ngx_http_server_build_string[] = "" NGINX_VER_BUILD CRLF;


# 修改第三个配置文件为ngx_http_special_response.c，对外页面报错时，他会控制是否展示敏感信息，修改如下列
21 static u_char ngx_http_error_full_tail[] =
22 "<hr><center>IIS</center>" CRLF
23 "</body>" CRLF
24 "</html>" CRLF
25 ;
26
27
28 static u_char ngx_http_error_build_tail[] =
29 "<hr><center>IIS</center>" CRLF
30 "</body>" CRLF
31 "</html>" CRLF
32 ;


# OR 

static u_char ngx_http_error_full_tail[] =
"<hr><center>" NGINX_VER "</center>" CRLF
"</body>" CRLF
"</html>" CRLF
;


static u_char ngx_http_error_build_tail[] =
"<hr><center>" NGINX_VER_BUILD "</center>" CRLF
"</body>" CRLF
"</html>" CRLF
;

# nginx -V 查看原来编译的参数，从新编译并且make && make install 才会生效,如果源码修改错误会编译不过去.如果编译前服务是启动的哪怕编译成功也是不生效的，需要重启服务.

# 编译,重启请看上面,接下来我们访问看下效果
[root@JD nginx1.14]# curl  localhost -I
HTTP/1.1 200 OK

[root@JD nginx1.14]# 

  sub_filter  '<hr><center>nginx</center>' '<hr><center>ws</center>';