The system must provide protection against IP fragmentation attacks.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-29498 | GEN000000-AIX0230 | SV-38702r1_rule | ECSC-1 | Medium |
| Description |
|---|
| The parameter ip_nfrag provides an additional layer of protection against IP fragmentation attacks. The value the ip_nfrag specifies is the maximum number of fragments of an IP packet that can be kept in the IP reassembly queue at any time. The default value of this network option is 200. This is a reasonable value for most environments and offers protection from IP fragmentation attacks. |
| STIG | Date |
|---|---|
| Draft AIX Security Technical Implementation Guide | 2011-08-17 |
Details
| Check Text ( C-37798r1_chk ) |
|---|
| Check the value of the ip_nfrag parameter. # /usr/sbin/no –o ip_nfrag If the result retuned is less than 199, this is a finding. |
| Fix Text (F-33056r1_fix) |
|---|
| Set the ip_nfrag parameter to 200. # /usr/sbin/no –p –o ip_nfrag=200 |