Oracle Linux 5 Security Technical Implementation Guide

The Oracle Linux 5 Security Technical Implementation Guide (V2 R1) has 571 STIG checks. New to STIG checklists? Read What is a STIG checklist?, CKL vs CKLB, and STIG vs SCAP benchmark.

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Severity

Version

V2 · R1

CurrentPublished Fri Jan 22 2021

The SSH client must be configured to not use Cipher-Block Chaining (CBC)-based ciphers.

Oracle Linux 5 Security Technical Implementation Guide

Assessment Title

Rule Text

The SSH client must be configured to not use Cipher-Block Chaining (CBC)-based ciphers.

Description

Discussion Text

The (CBC) mode of encryption as implemented in the SSHv2 protocol is vulnerable to chosen-plaintext attacks and must not be used.

New to STIG checklists? Read What is a STIG checklist? and CKL vs CKLB.

Objective

V-218604

Rule

SV-218604r603259_rule

Severity

medium

Rule Version

GEN005511

Documentable

false

IA Controls

NIST SP 800-53

Rev 5

Assessment Procedure

Check Text

Check the SSH client configuration for allowed ciphers.

# grep -i ciphers /etc/ssh/ssh_config | grep -v '^#'
 
If no lines are returned, or the returned ciphers list contains any cipher ending with "cbc", this is a finding.

Implementation Procedure

Fix Text

Edit the SSH client configuration and remove any ciphers not starting with "3des" or "aes" and remove any ciphers ending with "cbc". If necessary, add a "Ciphers" line.

STIG check 442 of 571 in the Oracle Linux 5 STIG checklist

← Previous · V-218603The SSH client must be configured to only use FIPS 140-2 approved ciphers.Next · V-218605 →The SSH client must be configured to only use Message Authentication Codes (MACs) employing FIPS 140-2 approved cryptographic hash algorithms.