NixOS must generate audit records when successful/unsuccessful attempts to modify security objects occur.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-268163 | ANIX-00-001720 | SV-268163r1039377_rule | Medium |
| Description |
| Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000463-GPOS-00207, SRG-OS-000042-GPOS-00020, SRG-OS-000458-GPOS-00203, SRG-OS-000474-GPOS-00219 |
| STIG | Date |
| Anduril NixOS Security Technical Implementation Guide | 2024-10-25 |
Details
| Check Text (C-72087r1039375_chk) |
| Verify the NixOS generates audit records when successful/unsuccessful attempts to modify security objects occur with the following command: $ sudo auditctl -l | grep xattr -a always,exit -F arch=b32 -S setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr -F auid>=1000 -F auid!=-1 -k perm_mod -a always,exit -F arch=b32 -S setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr -F auid=0 -k perm_mod -a always,exit -F arch=b64 -S setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr -F auid>=1000 -F auid!=-1 -k perm_mod -a always,exit -F arch=b64 -S setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr -F auid=0 -k perm_mod If the command does not return an audit rule for "setxattr", "fsetxattr", "lsetxattr", "removexattr", "fremovexattr", and "lremovexattr", this is a finding. |
| Fix Text (F-71990r1039376_fix) |
| Configure /etc/nixos/configuration.nix to log attempts to modify security objects by adding the following configuration settings: security.audit.rules = [ "-a always,exit -F arch=b32 -S setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr -F auid>=1000 -F auid!=-1 -k perm_mod" "-a always,exit -F arch=b32 -S setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr -F auid=0 -k perm_mod" "-a always,exit -F arch=b64 -S setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr -F auid>=1000 -F auid!=-1 -k perm_mod" "-a always,exit -F arch=b64 -S setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr -F auid=0 -k perm_mod" ]; Rebuild the system with the following command: $ sudo nixos-rebuild switch |