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The system must not have IP forwarding for IPv6 enabled, unless the system is an IPv6 router.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-22491 | GEN005610 | SV-37930r2_rule | ECSC-1 | Medium |
| Description |
|---|
| If the system is configured for IP forwarding and is not a designated router, it could be used to bypass network security by providing a path for communication not filtered by network devices. |
| STIG | Date |
|---|---|
| Red Hat Enterprise Linux 5 Security Technical Implementation Guide | 2014-01-09 |
Details
| Check Text ( C-37186r3_chk ) |
|---|
| Check if the system is configured for IPv6 forwarding. # grep [01] /proc/sys/net/ipv6/conf/*/forwarding|egrep "default|all" If the /proc/sys/net/ipv6/conf/*/forwarding entries do not exist because of compliance with GEN007720, this is not a finding. If all of the resulting lines do not end with 0, this is a finding. |
| Fix Text (F-32423r1_fix) |
|---|
| Disable IPv6 forwarding. Edit /etc/sysctl.conf and add a setting for "net.ipv6.conf.all.forwarding=0" and "net.ipv6.conf.default.forwarding=0". Reload the sysctls. Procedure: # sysctl -p |