Check: GEN005539
HP-UX 11.31 STIG:
GEN005539
(in versions v1 r19 through v1 r13)
Title
The 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
Check the SSH daemon configuration. Note that keywords are case-insensitive and arguments (args) are case-sensitive. keyword=Compression arg(s)="no" OR "delayed", IE: mutually exclusive arguments, should never occur together Default values include: "delayed" Note: When the default "arg" value exactly matches the required "arg" value (see above), the <keyword=arg> entry is not required to exist (commented or uncommented) in the ssh (client) or sshd (server) configuration file. While not required, it is recommended that the configuration file(s) be populated with all keywords and assigned arg values as a means to explicitly document the ssh(d) binary's expected behavior. Examine the file. # cat /opt/ssh/etc/sshd_config | tr '\011' ' ' | tr -s ' ' | sed -e 's/^[ \t]*//' | grep -v '^#' | grep -i "Compression" If configuration information is not returned or the return value is yes, this is a finding.
Fix Text
Edit the SSH daemon configuration and add or edit the Compression setting value to no or delayed.
Additional Identifiers
Rule ID: SV-35146r1_rule
Vulnerability ID: V-22488
Group Title: GEN005539
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-000366 |
The organization implements the security configuration settings. |
Controls
Number | Title |
---|---|
CM-6 |
Configuration Settings |