The system must not apply reversed source routing to TCP responses.

From SOLARIS 10 SPARC SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with: CCI-001551

SV-26626r2_rule The system must not apply reversed source routing to TCP responses.

Vulnerability discussion

Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures.

Check content

Determine the type of zone that you are currently securing. # zonename If the zone is not the global zone, determine if any interfaces are exclusive to the zone: # dladm show-link If the output indicates "insufficient privileges" then this requirement is not applicable. If the zone is the global zone or the non-global zone has exclusive interfaces verify the system does not apply reversed source routing to TCP responses. # ndd /dev/tcp tcp_rev_src_routes If the result is not 0, this is a finding.

Fix text

Configure the system to not apply reversed source routing to TCP responses. # ndd -set /dev/tcp tcp_rev_src_routes 0 Also add this command to a system startup script.

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