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Check: GEN003611

SUSE Linux Enterprise Server v11 for System z STIG: GEN003611 (in versions v1 r12 through v1 r9)

Title

The system must log martian packets. (Cat III impact)

Discussion

Martian packets are packets containing addresses known by the system to be invalid. Logging these messages allows the SA to identify misconfigurations or attacks in progress.

Check Content

Verify the system logs martian packets. # grep [01] /proc/sys/net/ipv4/conf/*/log_martians|egrep "default|all" If all of the resulting lines do not end with "1", this is a finding.

Fix Text

Configure the system to log martian packets. Edit /etc/sysctl.conf and add a setting for "net.ipv4.conf.all.log_martians=1" and "net.ipv4.conf.default.log_martians=1". Reload the sysctls. Procedure: # sysctl -p

Additional Identifiers

Rule ID: SV-45728r1_rule

Vulnerability ID: V-22418

Group Title: GEN003611

Expert Comments

Expert comments are only available to logged-in users.

CCIs

CCIs tied to check.

Number	Definition
CCI-000126	Specify the organization-defined event types (subset of the event types defined in AU-2a) along with the frequency of (or situation requiring logging for each identified event type.

Controls

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

Number	Title
AU-2	Audit Events