nginx禁用3DES和DES弱加密算法，保证SSL证书安全

收到漏扫报告↓↓↓↓↓↓↓

漏洞名称

SSL/TLS协议信息泄露漏洞(CVE-2016-2183)【原理扫描】

详细描述

TLS是安全传输层协议，用于在两个通信应用程序之间提供保密性和数据完整性。

TLS, SSH, IPSec协商及其他产品中使用的DES及Triple DES密码或者3DES及Triple 3DES存在大约四十亿块的生日界，这可使远程攻击者通过Sweet32攻击，获取纯文本数据。

<*来源：Karthik Bhargavan
Gaetan Leurent

链接：https://www.openssl.org/news/secadv/20160922.txt
*>

解决办法

建议：避免使用DES和3DES算法

1、OpenSSL Security Advisory [22 Sep 2016]
链接：https://www.openssl.org/news/secadv/20160922.txt
请在下列网页下载最新版本：
https://www.openssl.org/source/
2、对于nginx、apache、lighttpd等服务器禁止使用DES加密算法
主要是修改conf文件
3、Windows系统可以参考如下链接：
https://social.technet.microsoft.com/Forums/en-US/31b3ba6f-d0e6-417a-b6f1-d0103f054f8d/ssl-medium-strength-cipher-suites-supported-sweet32cve20162183?forum=ws2016

https://docs.microsoft.com/zh-cn/troubleshoot/windows-server/windows-security/restrict-cryptographic-algorithms-protocols-schannel

威胁分值

7.5

危险插件

否

发现日期

2016-08-31

CVE编号

CVE-2016-2183

BUGTRAQ

92630

NSFOCUS

34880

CNNVD编号

CNNVD-201608-448

CNCVE编号

CNCVE-20162183

CVSS评分

5.0

CNVD编号

CNVD-2016-06765

操作如下：

本机扫描

yum install -y nmap
nmap -sV -p 443 --script ssl-enum-ciphers 10.2.10.2

[root@zhtzdb-10 ~]# nmap -sV -p 443 --script ssl-enum-ciphers 10.2.10.2

Starting Nmap 6.40 ( http://nmap.org ) at 2022-07-05 10:36 CST
Nmap scan report for 10.2.10.2
Host is up (0.00011s latency).
PORT STATE SERVICE VERSION
443/tcp open http nginx
| ssl-enum-ciphers:
| SSLv3: No supported ciphers found
| TLSv1.0:
| ciphers:
| TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA - strong
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA - strong
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA - strong
| TLS_RSA_WITH_AES_128_CBC_SHA - strong
| TLS_RSA_WITH_AES_256_CBC_SHA - strong
| TLS_RSA_WITH_CAMELLIA_128_CBC_SHA - strong
| TLS_RSA_WITH_CAMELLIA_256_CBC_SHA - strong
| compressors:
| NULL
| TLSv1.1:
| ciphers:
| TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA - strong
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA - strong
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA - strong
| TLS_RSA_WITH_AES_128_CBC_SHA - strong
| TLS_RSA_WITH_AES_256_CBC_SHA - strong
| TLS_RSA_WITH_CAMELLIA_128_CBC_SHA - strong
| TLS_RSA_WITH_CAMELLIA_256_CBC_SHA - strong
| compressors:
| NULL
| TLSv1.2:
| ciphers:
| TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA - strong
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA - strong
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 - strong
| TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 - strong
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA - strong
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 - strong
| TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 - strong
| TLS_RSA_WITH_AES_128_CBC_SHA - strong
| TLS_RSA_WITH_AES_128_CBC_SHA256 - strong
| TLS_RSA_WITH_AES_128_GCM_SHA256 - strong
| TLS_RSA_WITH_AES_256_CBC_SHA - strong
| TLS_RSA_WITH_AES_256_CBC_SHA256 - strong
| TLS_RSA_WITH_AES_256_GCM_SHA384 - strong
| TLS_RSA_WITH_CAMELLIA_128_CBC_SHA - strong
| TLS_RSA_WITH_CAMELLIA_256_CBC_SHA - strong
| compressors:
| NULL
|_ least strength: strong

Service detection performed. Please report any incorrect results at http://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 6.34 seconds

编辑nginx.conf文件，修改ssl_ciphers后面的参数，如下↓

    server {
             listen 443 ssl;
             server_name  www.cookie.com;
             
             ssl_certificate      cert/2022_www.cookie.com.pem;
             ssl_certificate_key  cert/2022_www.cookie.com.key;
             ssl_session_timeout 5m;
             #ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE:ECDH:AES:HIGH:!NULL:!aNULL:!MD5:!ADH:!RC4;
            ** ssl_ciphers HIGH:!ADH:!MD5;**
             ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
             ssl_prefer_server_ciphers on;

保存退出，重启nginx服务。

重新执行nmap命令

[root@zhtzdb-10 ~]# nmap -sV -p 443 --script ssl-enum-ciphers 10.2.10.2

Starting Nmap 6.40 ( http://nmap.org ) at 2022-07-05 10:48 CST
Nmap scan report for 10.2.10.2
Host is up (0.00010s latency).
PORT STATE SERVICE VERSION
443/tcp open http nginx
| ssl-enum-ciphers:
| SSLv3: No supported ciphers found
| TLSv1.0:
| ciphers:
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA - strong
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA - strong
| TLS_ECDH_anon_WITH_AES_128_CBC_SHA - broken
| TLS_ECDH_anon_WITH_AES_256_CBC_SHA - broken
| TLS_RSA_WITH_AES_128_CBC_SHA - strong
| TLS_RSA_WITH_AES_256_CBC_SHA - strong
| TLS_RSA_WITH_CAMELLIA_128_CBC_SHA - strong
| TLS_RSA_WITH_CAMELLIA_256_CBC_SHA - strong
| compressors:
| NULL
| TLSv1.1:
| ciphers:
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA - strong
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA - strong
| TLS_ECDH_anon_WITH_AES_128_CBC_SHA - broken
| TLS_ECDH_anon_WITH_AES_256_CBC_SHA - broken
| TLS_RSA_WITH_AES_128_CBC_SHA - strong
| TLS_RSA_WITH_AES_256_CBC_SHA - strong
| TLS_RSA_WITH_CAMELLIA_128_CBC_SHA - strong
| TLS_RSA_WITH_CAMELLIA_256_CBC_SHA - strong
| compressors:
| NULL
| TLSv1.2:
| ciphers:
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA - strong
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 - strong
| TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 - strong
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA - strong
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 - strong
| TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 - strong
| TLS_ECDH_anon_WITH_AES_128_CBC_SHA - broken
| TLS_ECDH_anon_WITH_AES_256_CBC_SHA - broken
| TLS_RSA_WITH_AES_128_CBC_SHA - strong
| TLS_RSA_WITH_AES_128_CBC_SHA256 - strong
| TLS_RSA_WITH_AES_128_GCM_SHA256 - strong
| TLS_RSA_WITH_AES_256_CBC_SHA - strong
| TLS_RSA_WITH_AES_256_CBC_SHA256 - strong
| TLS_RSA_WITH_AES_256_GCM_SHA384 - strong
| TLS_RSA_WITH_CAMELLIA_128_CBC_SHA - strong
| TLS_RSA_WITH_CAMELLIA_256_CBC_SHA - strong
| compressors:
| NULL
|_ least strength: broken

Service detection performed. Please report any incorrect results at http://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 6.35 seconds