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Check: GEN005501

AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE: GEN005501 (in versions v1 r14 through v1 r10)

Title

The SSH client must be configured to only use the SSHv2 protocol. (Cat II impact)

Discussion

SSHv1 is not a DoD-approved protocol and has many well-known vulnerability exploits. Exploits of the SSH client could provide access to the system with the privileges of the user running the client.

Check Content

Check the SSH client configuration for allowed protocol versions. # grep -i protocol /etc/ssh/ssh_config | grep -v '^#' If the variables Protocol 2,1 or Protocol 1 are defined on a line without a leading comment, this is a finding. If the SSH client is F-Secure, the variable name for SSH 1 compatibility is Ssh1Compatibility, not protocol. If the variable Ssh1Compatiblity is set to yes, this is a finding.

Fix Text

Edit the /etc/ssh/ssh_config file and add or edit a Protocol configuration line that does not allow versions less than 2.

Additional Identifiers

Rule ID: SV-39209r1_rule

Vulnerability ID: V-22456

Group Title: GEN005501

Expert Comments

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CCIs

CCIs tied to check.

Number	Definition
CCI-001436	The organization disables organization-defined networking protocols within the information system deemed to be nonsecure except for explicitly identified components in support of specific operational requirements.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
No controls are assigned to this check