Detections
Analytics

1.314 ALMA-09-040720

Information

AlmaLinux OS 9 must disable access to network bpf system call from nonprivileged processes.

GROUP ID: V-269422
RULE ID: SV-269422r1117266

Loading and accessing the packet filters programs and maps using the bpf() system call has the potential of revealing sensitive information about the kernel state.

Solution

Configure AlmaLinux OS 9 to prevent privilege escalation through the kernel by disabling access to the bpf syscall with the following command:

$ echo "kernel.unprivileged_bpf_disabled = 1" > /etc/sysctl.d/60-bpf.conf

Load settings from all system configuration files with the following command:

$ sysctl --system

See Also

https://workbench.cisecurity.org/benchmarks/27039

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-2, CCI|CCI-001082, Rule-ID|SV-269422r1117266_rule, STIG-ID|ALMA-09-040720, Vuln-ID|V-269422

Plugin: Unix

Control ID: 6bc3a0e25bf7a693781afda253b613d67d7932bf4bed05dbb7e4ba03f3c594e0