TOSS must disable access to network bpf syscall from unprivileged processes.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-253113 | TOSS-04-040720 | SV-253113r991589_rule | CCI-000366 | medium |
| Description | ||||
| It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. | ||||
| STIG | Date | |||
| Tri-Lab Operating System Stack (TOSS) 4 Security Technical Implementation Guide | 2025-05-08 | |||
Related Frameworks
4 paths across 3 frameworks
Related Frameworks
NIST 800-531 mapping
CM-6
1.00
- DISA · 2 · disa_xccdf · related
- DISA · 2025-01-23 · disa_cci_list · equivalent
NIST 800-1712 mappings
3.4.1
1.00
- DISA · 2 · disa_xccdf · related
- DISA · 2025-01-23 · disa_cci_list · equivalent
- NIST · Rev 2 (Feb 2020, errata Jan 2021) · nist_800_171_app_d · equivalent
3.4.2
1.00
- DISA · 2 · disa_xccdf · related
- DISA · 2025-01-23 · disa_cci_list · equivalent
- NIST · Rev 2 (Feb 2020, errata Jan 2021) · nist_800_171_app_d · equivalent
CCI1 mapping
CCI-000366
1.00
- DISA · 2 · disa_xccdf · related
Details
Check Text (C-253113r991589_chk)
Verify TOSS prevents privilege escalation thru the kernel by disabling access to the bpf syscall with the following commands:
$ sudo sysctl kernel.unprivileged_bpf_disabled
kernel.unprivileged_bpf_disabled = 1
If the returned line does not have a value of "1", or a line is not returned, this is a finding.
Fix Text (F-56516r825010_fix)
Configure TOSS to prevent privilege escalation thru the kernel by disabling access to the bpf syscall by adding the following line to a file in the "/etc/sysctl.d" directory:
kernel.unprivileged_bpf_disabled = 1
The system configuration files need to be reloaded for the changes to take effect. To reload the contents of the files, run the following command:
$ sudo sysctl --system