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The system must not apply reversed source routing to TCP responses.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-22412 | GEN003605 | SV-35028r1_rule | ECSC-1 | Medium |
| Description |
|---|
| Source-routed packets allow the source of the packet to suggest routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. |
| STIG | Date |
|---|---|
| HP-UX 11.31 Security Technical Implementation Guide | 2017-12-08 |
Details
| Check Text ( C-36505r1_chk ) |
|---|
| Determine if the system is configured to forward source-routed IP packets. When correctly configured, if ip_forward_src_routed is disabled, the system is also configured to disable reverse source routing to TCP responses to source-routed packets. # ndd -get /dev/ip ip_forward_src_routed If the returned value is not '0', this feature is enabled and this is a finding. |
| Fix Text (F-31862r1_fix) |
|---|
| Disable the IP source-routed forwarding feature. # ndd -set /dev/ip ip_forward_src_routed 0 Edit /etc/rc.config.d/nddconf and add/set: TRANSPORT_NAME[x] = ip NDD_NAME[x] = ip_forward_src_routed NDD_VALUE[x] = 0 |