Finding ID | Version | Rule ID | IA Controls | Severity |
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V-22462 | GEN005511 | SV-37830r1_rule | ECSC-1 | Medium |
Description |
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The (CBC) mode of encryption as implemented in the SSHv2 protocol is vulnerable to chosen-plaintext attacks and must not be used. |
STIG | Date |
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Red Hat Enterprise Linux 5 Security Technical Implementation Guide | 2015-03-12 |
Check Text ( C-37030r1_chk ) |
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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. |
Fix Text (F-32298r2_fix) |
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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. |