「ssl-enum-ciphers」の版間の差分

提供: セキュリティ
移動: 案内、 検索
(ページの作成:「ssl-enum-ciphers とは、NSEスクリプトの１つで、nmapを利用して、Transport Layer Security(TLS)とSSLの脆弱...」)
(相違点なし)

2015年11月21日 (土) 13:20時点における版

ssl-enum-ciphers とは、NSEスクリプトの１つで、nmapを利用して、Transport Layer Security(TLS)とSSLの脆弱性検出の機能を提供します。

読み方

ssl-enum-ciphers

概要

nmap (Network Mapper) は、セキュリティスキャナで、ポートスキャンの機能やOSやサービスのバージョン検出、サービスの検出などの機能を持っています。

nmapは、NSEスクリプトと呼ばれる拡張機能を持っています。ssl-enum-ciphersは、NSEスクリプトの1つです。 TLS/SSLを診断し、利用している暗号アルゴリズムを列挙し、安全性を A,B,Cで評価し、警告を表示し、問題を教えてくれます。

例えば、

  • メッセージの完全性のためにサイファースイートがMD5を利用している
  • 証明書のシグネチャ(署名) に SHA-1 を利用している
  • SSLv3 での CBCモード暗号の利用は CVE-2014-3566 の問題がある

などを教えてくれます。

もし問題が見つかった場合

もし、問題が見つかったなら、修正をするべきですが、修正することによって、利用者に影響を及ぼすため、本当に変更してよいのか、考える必要があります。

問題の修正方法は、問題の内容によってことなりますが、よくある対応例を挙げます。

  • 証明書を設定を変更して作りなおす
  • OpenSSLをアップグレードする
  • ミドルウェアのサイファースイート(暗号スイート)の設定を変更する

インストール

nmapをインストールしてください。 

ubuntu# sudo apt install nmap
centos# sudo yum install nmap
freebsd# sudo pkg install nmap

使い方

$ nmap --script ssl-enum-ciphers login.example.co.jp -p 443

脆弱性診断

これは、実行例です。

login.yahoo.co.jp

$ nmap --script ssl-enum-ciphers login.yahoo.co.jp -p 443
 
Starting Nmap 6.49BETA6 ( https://nmap.org ) at 2015-11-21 13:06 JST
Nmap scan report for login.yahoo.co.jp (182.22.59.186)
Host is up (0.012s latency).
PORT    STATE SERVICE
443/tcp open  https
| ssl-enum-ciphers:
|   SSLv3:
|     ciphers:
|       TLS_ECDHE_RSA_WITH_RC4_128_SHA (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp256r1) - A
|       TLS_RSA_WITH_RC4_128_SHA (rsa 2048) - A
|       TLS_RSA_WITH_RC4_128_MD5 (rsa 2048) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) - C
|     compressors:
|       NULL
|     cipher preference: server
|     warnings:
|       CBC-mode cipher in SSLv3 (CVE-2014-3566)
|       Ciphersuite uses MD5 for message integrity
|       Weak certificate signature: SHA1
|   TLSv1.0:
|     ciphers:
|       TLS_ECDHE_RSA_WITH_RC4_128_SHA (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp256r1) - A
|       TLS_RSA_WITH_RC4_128_SHA (rsa 2048) - A
|       TLS_RSA_WITH_RC4_128_MD5 (rsa 2048) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) - C
|     compressors:
|       NULL
|     cipher preference: server
|     warnings:
|       Ciphersuite uses MD5 for message integrity
|       Weak certificate signature: SHA1
|   TLSv1.1:
|     ciphers:
|       TLS_ECDHE_RSA_WITH_RC4_128_SHA (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp256r1) - A
|       TLS_RSA_WITH_RC4_128_SHA (rsa 2048) - A
|       TLS_RSA_WITH_RC4_128_MD5 (rsa 2048) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) - C
|     compressors:
|       NULL
|     cipher preference: server
|     warnings:
|       Ciphersuite uses MD5 for message integrity
|       Weak certificate signature: SHA1
|       Weak cipher RC4 in TLSv1.1 or newer not needed for BEAST mitigation
|   TLSv1.2:
|     ciphers:
|       TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (secp256r1) - A
|       TLS_RSA_WITH_AES_128_GCM_SHA256 (rsa 2048) - A
|       TLS_RSA_WITH_AES_256_GCM_SHA384 (rsa 2048) - A
|       TLS_ECDHE_RSA_WITH_RC4_128_SHA (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp256r1) - A
|       TLS_RSA_WITH_RC4_128_SHA (rsa 2048) - A
|       TLS_RSA_WITH_RC4_128_MD5 (rsa 2048) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) - C
|     compressors:
|       NULL
|     cipher preference: server
|     warnings:
|       Ciphersuite uses MD5 for message integrity
|       Weak certificate signature: SHA1
|       Weak cipher RC4 in TLSv1.1 or newer not needed for BEAST mitigation
|_  least strength: C
 
Nmap done: 1 IP address (1 host up) scanned in 2.44 seconds

login.yahoo.com

$ nmap --script ssl-enum-ciphers login.yahoo.com -p 443
 
Starting Nmap 6.49BETA6 ( https://nmap.org ) at 2015-11-21 12:53 JST
Nmap scan report for login.yahoo.com (98.136.189.41)
Host is up (0.14s latency).
Other addresses for login.yahoo.com (not scanned): 98.138.79.21
rDNS record for 98.136.189.41: ats1.member.vip.gq1.yahoo.com
PORT    STATE SERVICE
443/tcp open  https
| ssl-enum-ciphers:
|   TLSv1.0:
|     ciphers:
|       TLS_ECDHE_RSA_WITH_RC4_128_SHA (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp256r1) - A
|       TLS_RSA_WITH_RC4_128_SHA (rsa 2048) - A
|       TLS_RSA_WITH_RC4_128_MD5 (rsa 2048) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) - C
|     compressors:
|       NULL
|       TLS_RSA_WITH_RC4_128_SHA (rsa 2048) - A
|       TLS_RSA_WITH_RC4_128_MD5 (rsa 2048) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) - C
|     compressors:
|       NULL
|     cipher preference: server
|     warnings:
|       Ciphersuite uses MD5 for message integrity
|       Weak cipher RC4 in TLSv1.1 or newer not needed for BEAST mitigation
|   TLSv1.2:
|     ciphers:
|       TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (secp256r1) - A
|       TLS_RSA_WITH_AES_128_GCM_SHA256 (rsa 2048) - A
|       TLS_RSA_WITH_AES_256_GCM_SHA384 (rsa 2048) - A
|       TLS_ECDHE_RSA_WITH_RC4_128_SHA (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp256r1) - A
|       TLS_RSA_WITH_RC4_128_SHA (rsa 2048) - A
|       TLS_RSA_WITH_RC4_128_MD5 (rsa 2048) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) - C
|     compressors:
|       NULL
|     cipher preference: server
|     warnings:
|       Ciphersuite uses MD5 for message integrity
|       Weak cipher RC4 in TLSv1.1 or newer not needed for BEAST mitigation
|_  least strength: C
 
Nmap done: 1 IP address (1 host up) scanned in 17.54 seconds

accounts.google.com

$ nmap --script ssl-enum-ciphers accounts.google.com -p 443
 
Starting Nmap 6.49BETA6 ( https://nmap.org ) at 2015-11-21 13:05 JST
Nmap scan report for accounts.google.com (216.58.220.237)
Host is up (0.011s latency).
rDNS record for 216.58.220.237: nrt13s37-in-f13.1e100.net
PORT    STATE SERVICE
443/tcp open  https
| ssl-enum-ciphers:
|   SSLv3:
|     ciphers:
|       TLS_ECDHE_RSA_WITH_RC4_128_SHA (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp256r1) - A
|       TLS_RSA_WITH_RC4_128_SHA (rsa 2048) - A
|       TLS_RSA_WITH_RC4_128_MD5 (rsa 2048) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
|       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp256r1) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) - C
|     compressors:
|       NULL
|     cipher preference: server
|     warnings:
|       CBC-mode cipher in SSLv3 (CVE-2014-3566)
|       Ciphersuite uses MD5 for message integrity
|   TLSv1.0:
|     ciphers:
|       TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_RC4_128_SHA (secp256r1) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) - C
|       TLS_RSA_WITH_RC4_128_SHA (rsa 2048) - A
|       TLS_RSA_WITH_RC4_128_MD5 (rsa 2048) - A
|       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp256r1) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
|     compressors:
|       NULL
|     cipher preference: server
|     warnings:
|       Ciphersuite uses MD5 for message integrity
|   TLSv1.1:
|     ciphers:
|       TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_RC4_128_SHA (secp256r1) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) - C
|       TLS_RSA_WITH_RC4_128_SHA (rsa 2048) - A
|       TLS_RSA_WITH_RC4_128_MD5 (rsa 2048) - A
|       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp256r1) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
|     compressors:
|       NULL
|     cipher preference: server
|     warnings:
|       Ciphersuite uses MD5 for message integrity
|       Weak cipher RC4 in TLSv1.1 or newer not needed for BEAST mitigation
|   TLSv1.2:
|     ciphers:
|       TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_RC4_128_SHA (secp256r1) - A
|       TLS_RSA_WITH_AES_128_GCM_SHA256 (rsa 2048) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA256 (rsa 2048) - A
|       TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) - C
|       TLS_RSA_WITH_RC4_128_SHA (rsa 2048) - A
|       TLS_RSA_WITH_RC4_128_MD5 (rsa 2048) - A
|       TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 (secp256r1) - A
|       TLS_RSA_WITH_AES_256_GCM_SHA384 (rsa 2048) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA256 (rsa 2048) - A
|     compressors:
|       NULL
|     cipher preference: server
|     warnings:
|       Ciphersuite uses MD5 for message integrity
|       Weak cipher RC4 in TLSv1.1 or newer not needed for BEAST mitigation
|_  least strength: C
 
Nmap done: 1 IP address (1 host up) scanned in 2.34 seconds

login.live.com

$ nmap --script ssl-enum-ciphers login.live.com -p 443
 
Starting Nmap 6.49BETA6 ( https://nmap.org ) at 2015-11-21 13:04 JST
Nmap scan report for login.live.com (131.253.61.82)
Host is up (0.17s latency).
Other addresses for login.live.com (not scanned): 131.253.61.68 131.253.61.98 131.253.61.80
PORT    STATE SERVICE
443/tcp open  https
| ssl-enum-ciphers:
|   TLSv1.0:
|     ciphers:
|       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp521r1) - A
|       TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp521r1) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) - C
|     compressors:
|       NULL
|     cipher preference: server
|   TLSv1.1:
|     ciphers:
|       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp521r1) - A
|       TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp521r1) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) - C
|     compressors:
|       NULL
|     cipher preference: server
|   TLSv1.2:
|     ciphers:
|       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (secp521r1) - A
|       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp521r1) - A
|       TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 (secp521r1) - A
|       TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp521r1) - A
|       TLS_RSA_WITH_AES_256_GCM_SHA384 (rsa 2048) - A
|       TLS_RSA_WITH_AES_128_GCM_SHA256 (rsa 2048) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA256 (rsa 2048) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA256 (rsa 2048) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
|       TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) - C
|     compressors:
|       NULL
|     cipher preference: server
|_  least strength: C
 
Nmap done: 1 IP address (1 host up) scanned in 15.21 seconds

関連項目

「https://kaworu.jpn.org/security/index.php?title=ssl-enum-ciphers&oldid=3522」から取得