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The SUSE operating system SSH daemon must not allow compression or must only allow compression after successful authentication.


Overview

Finding ID Version Rule ID IA Controls Severity
V-77471 SLES-12-030250 SV-92167r2_rule Medium
Description
If compression is allowed in an SSH connection prior to authentication, vulnerabilities in the compression software could result in compromise of the system from an unauthenticated connection, potentially with root privileges.
STIG Date
SLES 12 Security Technical Implementation Guide 2018-09-27

Details

Check Text ( C-77031r2_chk )
Verify the SUSE operating system SSH daemon performs compression after a user successfully authenticates.

Check that the SSH daemon performs compression after a user successfully authenticates with the following command:

# sudo grep -i compression /etc/ssh/sshd_config
Compression delayed

If the "Compression" keyword is set to "yes", is missing, or the returned line is commented out, this is a finding.
Fix Text (F-84113r1_fix)
Configure the SUSE operating system SSH daemon performs compression after a user successfully authenticates.

Uncomment the "Compression" keyword in "/etc/ssh/sshd_config" on the system and set the value to "delayed" or "no":

Compression no