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Check: GEN007860

AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE: GEN007860 (in versions v1 r14 through v1 r10)

Title

The system must ignore IPv6 ICMP redirect messages. (Cat II impact)

Discussion

ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An illicit ICMP redirect message could result in a man-in-the-middle attack.

Check Content

Determine if the system is configured to ignore IPv6 ICMP redirect messages. If it is not, this is a finding. # /usr/sbin/no -o ipignoreredirects If the value returned is not 1, this is a finding.

Fix Text

Configure the system to ignore IPv6 ICMP redirect messages. # /usr/sbin/no -p -o ipignoreredirects=1

Additional Identifiers

Rule ID: SV-38825r1_rule

Vulnerability ID: V-22550

Group Title: GEN007860

Expert Comments

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CCIs

CCIs tied to check.

Number	Definition
CCI-001551	The organization defines approved authorizations for controlling the flow of information between interconnected systems.

Controls

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

Number	Title
AC-4	Information Flow Enforcement