問題

由于等保的原因，被服務(wù)商掃描出漏洞。
warnings:
| 64-bit block cipher 3DES vulnerable to SWEET32 attack

漏洞復(fù)現(xiàn)

$ nmap -sV --script ssl-enum-ciphers -p 443 xx.xxxxbac.com
Starting Nmap 7.80 ( https://nmap.org ) at 2022-09-27 10:54 CST
Nmap scan report for xx.xxxxbac.com (120.77.xx.xx)
Host is up (0.0090s latency).

PORT    STATE SERVICE  VERSION
443/tcp open  ssl/http nginx
| ssl-enum-ciphers: 
|   TLSv1.1: 
|     ciphers: 
|       TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (ecdh_x25519) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
|       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (ecdh_x25519) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
|       TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA (ecdh_x25519) - C
|       TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) - C
|     compressors: 
|       NULL
|     cipher preference: server
|     warnings: 
|       64-bit block cipher 3DES vulnerable to SWEET32 attack
|   TLSv1.2: 
|     ciphers: 
|       TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 (ecdh_x25519) - A
|       TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (ecdh_x25519) - A
|       TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 (ecdh_x25519) - A
|       TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (ecdh_x25519) - A
|       TLS_RSA_WITH_AES_128_GCM_SHA256 (rsa 2048) - A
|       TLS_RSA_WITH_AES_128_CCM_8 (rsa 2048) - A
|       TLS_RSA_WITH_AES_128_CCM (rsa 2048) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA256 (rsa 2048) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
|       TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (ecdh_x25519) - A
|       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (ecdh_x25519) - A
|       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (ecdh_x25519) - A
|       TLS_RSA_WITH_AES_256_GCM_SHA384 (rsa 2048) - A
|       TLS_RSA_WITH_AES_256_CCM_8 (rsa 2048) - A
|       TLS_RSA_WITH_AES_256_CCM (rsa 2048) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA256 (rsa 2048) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
|       TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA (ecdh_x25519) - C
|       TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) - C
|     compressors: 
|       NULL
|     cipher preference: server
|     warnings: 
|       64-bit block cipher 3DES vulnerable to SWEET32 attack
|_  least strength: C

Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 14.93 seconds

如何不喜歡使用nmap,也可以使用如下工具testssl.sh，但是輸出的內(nèi)容太多了，本次我只截取部分

$  docker run --rm -ti  drwetter/testssl.sh　 xx.xxxxbac.com
###########################################################
    testssl.sh       3.2rc1 from https://testssl.sh/dev/

      This program is free software. Distribution and
             modification under GPLv2 permitted.
      USAGE w/o ANY WARRANTY. USE IT AT YOUR OWN RISK!

       Please file bugs @ https://testssl.sh/bugs/

###########################################################
 Secure Renegotiation (RFC 5746)           supported (OK)
 Secure Client-Initiated Renegotiation     not vulnerable (OK)
 CRIME, TLS (CVE-2012-4929)                not vulnerable (OK)
 BREACH (CVE-2013-3587)                    no gzip/deflate/compress/br HTTP compression (OK)  - only supplied "/" tested
 POODLE, SSL (CVE-2014-3566)               not vulnerable (OK), no SSLv3 support
 TLS_FALLBACK_SCSV (RFC 7507)              Downgrade attack prevention supported (OK)
 SWEET32 (CVE-2016-2183, CVE-2016-6329)    VULNERABLE, uses 64 bit block ciphers

解決辦法

解決辦法有兩個，一個是升級OpenSSL 1.0.2k-fips 26 Jan 2017 以上，另外一個是更新nginx配置，禁用3DES和DES弱加密算法。
第一個比較麻煩，影響面積比較廣，centos7 上，大多數(shù)教程都是需要自行編譯，影響線上環(huán)境。
本次介紹第二種方法，更新nginx配置禁用3DES和DES弱加密算法，然后nginx -s reload即可。

#注釋下面的語句
#ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE:ECDH:AES:HIGH:!NULL:!aNULL:!MD5:!ADH:!RC4;
ssl_ciphers HIGH:!ADH:!MD5;

再次運行，將會全部提示A等級。文章來源地址http://www.zghlxwxcb.cn/news/detail-510501.html

nmap -sV --script ssl-enum-ciphers -p 443 xx.xxxxbac.com

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