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SSH の脆弱性: HMAC アルゴリズムと CBC 暗号化

Solution Verified - Updated -

Issue

  • NCircle によると、以下の脆弱性が RHEL 5 サーバーおよび RHEL 6 サーバーで発生しました (RHEL7 にも関係します)。
SSH Insecure HMAC Algorithms Enabled
SSH CBC Mode Ciphers Enabled

Below is the update from NCircle regarding the vulnerabilities 

Vulnerability Name:SSH Insecure HMAC Algorithms Enabled

Description:Insecure HMAC Algorithms are enabled

Solution:
Disable any 96-bit HMAC Algorithms.Disable any MD5-based HMAC Algorithms.

Vulnerability Name:SSH CBC Mode Ciphers Enabled

Description:CBC Mode Ciphers are enabled on the SSH Server.

Solution:Disable CBC Mode Ciphers and use CTR Mode Ciphers

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6

  • Red Hat Enterprise Linux 5

  • OpenSSH

  • Putty

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