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4.1.2.4 Ensure audit_backlog_limit is sufficient

Warning! Audit Deprecated

This audit has been deprecated and will be removed in a future update.

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Information

The backlog limit has a default setting of 64

Rationale:

during boot if audit=1, then the backlog will hold 64 records. If more that 64 records are created during boot, auditd records will be lost and potential malicious activity could go undetected.

Solution

Edit /etc/default/grub and add audit_backlog_limit=<BACKLOG SIZE> to GRUB_CMDLINE_LINUX:
Example:

GRUB_CMDLINE_LINUX='audit_backlog_limit=8192'

Run the following command to update the grub2 configuration:

# grub2-mkconfig -o /boot/grub2/grub.cfg

See Also

https://workbench.cisecurity.org/files/2854

Item Details

Category: AUDIT AND ACCOUNTABILITY, SYSTEM AND INFORMATION INTEGRITY

References: 800-53|AU-14(1), 800-53|SI-7(9), CSCv7|6.2

Plugin: Unix

Control ID: 668e7a010c46e1347beaf505b61bb59f9dc67c81e8b6608d53e7dbb04d389b96