Detections
Analytics

1.63 OL08-00-010376

Information

OL 8 must prevent kernel profiling by unprivileged users.

GROUP ID: V-248580
RULE ID: SV-248580r958524

Preventing unauthorized information transfers mitigates the risk of information, including encrypted representations of information, produced by the actions of prior users/roles (or the actions of processes acting on behalf of prior users/roles) from being available to any current users/roles (or current processes) that obtain access to shared system resources (e.g., registers, main memory, hard disks) after those resources have been released back to information systems. The control of information in shared resources is also commonly referred to as object reuse and residual information protection.

This requirement generally applies to the design of an information technology product, but it can also apply to the configuration of particular information system components that are, or use, such products. This can be verified by acceptance/validation processes in DoD or other government agencies.

There may be shared resources with configurable protections (e.g., files in storage) that may be assessed on specific information system components.

Setting the "kernel.perf_event_paranoid" kernel parameter to "2" prevents attackers from gaining additional system information as a non-privileged user.

The sysctl --system command will load settings from all system configuration files. All configuration files are sorted by their filename in lexicographic order, regardless of which of the directories they reside in. If multiple files specify the same option, the entry in the file with the lexicographically latest name will take precedence. Files are read from directories in the following list from top to bottom. Once a file of a given filename is loaded, any file of the same name in subsequent directories is ignored./etc/sysctl.d/ .conf/run/sysctl.d/ .conf/usr/local/lib/sysctl.d/ .conf/usr/lib/sysctl.d/ .conf/lib/sysctl.d/*.conf/etc/sysctl.conf

Solution

Configure OL 8 to prevent kernel profiling by unprivileged users.

Add or edit the following line in a system configuration file in the "/etc/sysctl.d/" directory:

kernel.perf_event_paranoid = 2

Remove any configurations that conflict with the above from the following locations:

/run/sysctl.d/*.conf
/usr/local/lib/sysctl.d/*.conf
/usr/lib/sysctl.d/*.conf
/lib/sysctl.d/*.conf
/etc/sysctl.conf
/etc/sysctl.d/*.conf

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

$ sudo sysctl --system

See Also

https://workbench.cisecurity.org/benchmarks/23791

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-4, CAT|III, CCI|CCI-001090, Rule-ID|SV-248580r958524_rule, STIG-ID|OL08-00-010376, Vuln-ID|V-248580

Plugin: Unix

Control ID: 4e8fe0c05934d3e8fb825133aec86e79db35a9e154b9d6c2901f1f46fe24b71a