Check: SLES-12-030250
SLES 12 STIG:
SLES-12-030250
(in versions v2 r13 through v2 r9)
Title
The SUSE operating system SSH daemon must not allow compression or must only allow compression after successful authentication. (Cat II impact)
Discussion
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.
Check Content
Note: If the installed version of OpenSSH is 7.4 or above, this requirement is not applicable. 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
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
Additional Identifiers
Rule ID: SV-217279r880925_rule
Vulnerability ID: V-217279
Group Title: SRG-OS-000480-GPOS-00227
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-000366 |
The organization implements the security configuration settings. |
Controls
Number | Title |
---|---|
CM-6 |
Configuration Settings |